vacuum.h File Reference

#include "access/htup.h"
#include "access/genam.h"
#include "access/parallel.h"
#include "catalog/pg_class.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_type.h"
#include "parser/parse_node.h"
#include "storage/buf.h"
#include "storage/lock.h"
#include "utils/relcache.h"

Include dependency graph for vacuum.h:

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Go to the source code of this file.

Data Structures
struct	VacAttrStats
struct	VacuumParams
struct	VacuumCutoffs
struct	VacDeadItems

Macros
#define	VACUUM_OPTION_NO_PARALLEL   0
#define	VACUUM_OPTION_PARALLEL_BULKDEL   (1 << 0)
#define	VACUUM_OPTION_PARALLEL_COND_CLEANUP   (1 << 1)
#define	VACUUM_OPTION_PARALLEL_CLEANUP   (1 << 2)
#define	VACUUM_OPTION_MAX_VALID_VALUE   ((1 << 3) - 1)
#define	VACOPT_VACUUM   0x01 /* do VACUUM */
#define	VACOPT_ANALYZE   0x02 /* do ANALYZE */
#define	VACOPT_VERBOSE   0x04 /* output INFO instrumentation messages */
#define	VACOPT_FREEZE   0x08 /* FREEZE option */
#define	VACOPT_FULL   0x10 /* FULL (non-concurrent) vacuum */
#define	VACOPT_SKIP_LOCKED   0x20 /* skip if cannot get lock */
#define	VACOPT_PROCESS_MAIN   0x40 /* process main relation */
#define	VACOPT_PROCESS_TOAST   0x80 /* process the TOAST table, if any */
#define	VACOPT_DISABLE_PAGE_SKIPPING   0x100 /* don't skip any pages */
#define	VACOPT_SKIP_DATABASE_STATS   0x200 /* skip vac_update_datfrozenxid() */
#define	VACOPT_ONLY_DATABASE_STATS   0x400 /* only vac_update_datfrozenxid() */
#define	MAXDEADITEMS(avail_mem)    (((avail_mem) - offsetof(VacDeadItems, items)) / sizeof(ItemPointerData))
#define	MAX_STATISTICS_TARGET   10000

Typedefs
typedef struct ParallelVacuumState	ParallelVacuumState
typedef struct VacAttrStats *	VacAttrStatsP
typedef Datum(*	AnalyzeAttrFetchFunc) (VacAttrStatsP stats, int rownum, bool *isNull)
typedef void(*	AnalyzeAttrComputeStatsFunc) (VacAttrStatsP stats, AnalyzeAttrFetchFunc fetchfunc, int samplerows, double totalrows)
typedef struct VacAttrStats	VacAttrStats
typedef enum VacOptValue	VacOptValue
typedef struct VacuumParams	VacuumParams
typedef struct VacDeadItems	VacDeadItems

Enumerations
enum	VacOptValue { VACOPTVALUE_UNSPECIFIED = 0 , VACOPTVALUE_AUTO , VACOPTVALUE_DISABLED , VACOPTVALUE_ENABLED }

Functions
void	ExecVacuum (ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
void	vacuum (List *relations, VacuumParams *params, BufferAccessStrategy bstrategy, MemoryContext vac_context, bool isTopLevel)
void	vac_open_indexes (Relation relation, LOCKMODE lockmode, int *nindexes, Relation **Irel)
void	vac_close_indexes (int nindexes, Relation *Irel, LOCKMODE lockmode)
double	vac_estimate_reltuples (Relation relation, BlockNumber total_pages, BlockNumber scanned_pages, double scanned_tuples)
void	vac_update_relstats (Relation relation, BlockNumber num_pages, double num_tuples, BlockNumber num_all_visible_pages, bool hasindex, TransactionId frozenxid, MultiXactId minmulti, bool *frozenxid_updated, bool *minmulti_updated, bool in_outer_xact)
bool	vacuum_get_cutoffs (Relation rel, const VacuumParams *params, struct VacuumCutoffs *cutoffs)
bool	vacuum_xid_failsafe_check (const struct VacuumCutoffs *cutoffs)
void	vac_update_datfrozenxid (void)
void	vacuum_delay_point (void)
bool	vacuum_is_relation_owner (Oid relid, Form_pg_class reltuple, bits32 options)
Relation	vacuum_open_relation (Oid relid, RangeVar *relation, bits32 options, bool verbose, LOCKMODE lmode)
IndexBulkDeleteResult *	vac_bulkdel_one_index (IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat, VacDeadItems *dead_items)
IndexBulkDeleteResult *	vac_cleanup_one_index (IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)
Size	vac_max_items_to_alloc_size (int max_items)
void	AutoVacuumUpdateCostLimit (void)
void	VacuumUpdateCosts (void)
ParallelVacuumState *	parallel_vacuum_init (Relation rel, Relation *indrels, int nindexes, int nrequested_workers, int max_items, int elevel, BufferAccessStrategy bstrategy)
void	parallel_vacuum_end (ParallelVacuumState *pvs, IndexBulkDeleteResult **istats)
VacDeadItems *	parallel_vacuum_get_dead_items (ParallelVacuumState *pvs)
void	parallel_vacuum_bulkdel_all_indexes (ParallelVacuumState *pvs, long num_table_tuples, int num_index_scans)
void	parallel_vacuum_cleanup_all_indexes (ParallelVacuumState *pvs, long num_table_tuples, int num_index_scans, bool estimated_count)
void	parallel_vacuum_main (dsm_segment *seg, shm_toc *toc)
void	analyze_rel (Oid relid, RangeVar *relation, VacuumParams *params, List *va_cols, bool in_outer_xact, BufferAccessStrategy bstrategy)
bool	std_typanalyze (VacAttrStats *stats)
double	anl_random_fract (void)
double	anl_init_selection_state (int n)
double	anl_get_next_S (double t, int n, double *stateptr)

Variables
PGDLLIMPORT int	default_statistics_target
PGDLLIMPORT int	vacuum_freeze_min_age
PGDLLIMPORT int	vacuum_freeze_table_age
PGDLLIMPORT int	vacuum_multixact_freeze_min_age
PGDLLIMPORT int	vacuum_multixact_freeze_table_age
PGDLLIMPORT int	vacuum_failsafe_age
PGDLLIMPORT int	vacuum_multixact_failsafe_age
PGDLLIMPORT pg_atomic_uint32 *	VacuumSharedCostBalance
PGDLLIMPORT pg_atomic_uint32 *	VacuumActiveNWorkers
PGDLLIMPORT int	VacuumCostBalanceLocal
PGDLLIMPORT bool	VacuumFailsafeActive
PGDLLIMPORT double	vacuum_cost_delay
PGDLLIMPORT int	vacuum_cost_limit

Macro Definition Documentation

MAX_STATISTICS_TARGET

#define MAX_STATISTICS_TARGET   10000

Definition at line 308 of file vacuum.h.

MAXDEADITEMS

#define MAXDEADITEMS

(

avail_mem

)

(((avail_mem) - offsetof(VacDeadItems, items)) / sizeof(ItemPointerData))

Definition at line 291 of file vacuum.h.

VACOPT_ANALYZE

#define VACOPT_ANALYZE   0x02 /* do ANALYZE */

Definition at line 180 of file vacuum.h.

VACOPT_DISABLE_PAGE_SKIPPING

#define VACOPT_DISABLE_PAGE_SKIPPING   0x100 /* don't skip any pages */

Definition at line 187 of file vacuum.h.

VACOPT_FREEZE

#define VACOPT_FREEZE   0x08 /* FREEZE option */

Definition at line 182 of file vacuum.h.

VACOPT_FULL

#define VACOPT_FULL   0x10 /* FULL (non-concurrent) vacuum */

Definition at line 183 of file vacuum.h.

VACOPT_ONLY_DATABASE_STATS

#define VACOPT_ONLY_DATABASE_STATS   0x400 /* only vac_update_datfrozenxid() */

Definition at line 189 of file vacuum.h.

VACOPT_PROCESS_MAIN

#define VACOPT_PROCESS_MAIN   0x40 /* process main relation */

Definition at line 185 of file vacuum.h.

VACOPT_PROCESS_TOAST

#define VACOPT_PROCESS_TOAST   0x80 /* process the TOAST table, if any */

Definition at line 186 of file vacuum.h.

VACOPT_SKIP_DATABASE_STATS

#define VACOPT_SKIP_DATABASE_STATS   0x200 /* skip vac_update_datfrozenxid() */

Definition at line 188 of file vacuum.h.

VACOPT_SKIP_LOCKED

#define VACOPT_SKIP_LOCKED   0x20 /* skip if cannot get lock */

Definition at line 184 of file vacuum.h.

VACOPT_VACUUM

#define VACOPT_VACUUM   0x01 /* do VACUUM */

Definition at line 179 of file vacuum.h.

VACOPT_VERBOSE

#define VACOPT_VERBOSE   0x04 /* output INFO instrumentation messages */

Definition at line 181 of file vacuum.h.

VACUUM_OPTION_MAX_VALID_VALUE

#define VACUUM_OPTION_MAX_VALID_VALUE   ((1 << 3) - 1)

Definition at line 65 of file vacuum.h.

VACUUM_OPTION_NO_PARALLEL

#define VACUUM_OPTION_NO_PARALLEL   0

Definition at line 41 of file vacuum.h.

VACUUM_OPTION_PARALLEL_BULKDEL

#define VACUUM_OPTION_PARALLEL_BULKDEL   (1 << 0)

Definition at line 47 of file vacuum.h.

VACUUM_OPTION_PARALLEL_CLEANUP

#define VACUUM_OPTION_PARALLEL_CLEANUP   (1 << 2)

Definition at line 62 of file vacuum.h.

VACUUM_OPTION_PARALLEL_COND_CLEANUP

#define VACUUM_OPTION_PARALLEL_COND_CLEANUP   (1 << 1)

Definition at line 54 of file vacuum.h.

Typedef Documentation

AnalyzeAttrComputeStatsFunc

typedef void(* AnalyzeAttrComputeStatsFunc) (VacAttrStatsP stats, AnalyzeAttrFetchFunc fetchfunc, int samplerows, double totalrows)

Definition at line 110 of file vacuum.h.

AnalyzeAttrFetchFunc

typedef Datum(* AnalyzeAttrFetchFunc) (VacAttrStatsP stats, int rownum, bool *isNull)

Definition at line 107 of file vacuum.h.

ParallelVacuumState

typedef struct ParallelVacuumState ParallelVacuumState

Definition at line 1 of file vacuum.h.

VacAttrStats

typedef struct VacAttrStats VacAttrStats

VacAttrStatsP

typedef struct VacAttrStats* VacAttrStatsP

Definition at line 105 of file vacuum.h.

VacDeadItems

typedef struct VacDeadItems VacDeadItems

VacOptValue

typedef enum VacOptValue VacOptValue

VacuumParams

typedef struct VacuumParams VacuumParams

Enumeration Type Documentation

VacOptValue

enum VacOptValue

Enumerator
VACOPTVALUE_UNSPECIFIED
VACOPTVALUE_AUTO
VACOPTVALUE_DISABLED
VACOPTVALUE_ENABLED

Definition at line 199 of file vacuum.h.

{
    VACOPTVALUE_UNSPECIFIED = 0,
    VACOPTVALUE_AUTO,
    VACOPTVALUE_DISABLED,
    VACOPTVALUE_ENABLED,
} VacOptValue;

Function Documentation

analyze_rel()

void analyze_rel	(	Oid	relid,
		RangeVar *	relation,
		VacuumParams *	params,
		List *	va_cols,
		bool	in_outer_xact,
		BufferAccessStrategy	bstrategy
	)

Definition at line 121 of file analyze.c.

{
    Relation    onerel;
    int         elevel;
    AcquireSampleRowsFunc acquirefunc = NULL;
    BlockNumber relpages = 0;
 
    /* Select logging level */
    if (params->options & VACOPT_VERBOSE)
        elevel = INFO;
    else
        elevel = DEBUG2;
 
    /* Set up static variables */
    vac_strategy = bstrategy;
 
    /*
     * Check for user-requested abort.
     */
    CHECK_FOR_INTERRUPTS();
 
    /*
     * Open the relation, getting ShareUpdateExclusiveLock to ensure that two
     * ANALYZEs don't run on it concurrently.  (This also locks out a
     * concurrent VACUUM, which doesn't matter much at the moment but might
     * matter if we ever try to accumulate stats on dead tuples.) If the rel
     * has been dropped since we last saw it, we don't need to process it.
     *
     * Make sure to generate only logs for ANALYZE in this case.
     */
    onerel = vacuum_open_relation(relid, relation, params->options & ~(VACOPT_VACUUM),
                                  params->log_min_duration >= 0,
                                  ShareUpdateExclusiveLock);
 
    /* leave if relation could not be opened or locked */
    if (!onerel)
        return;
 
    /*
     * Check if relation needs to be skipped based on ownership.  This check
     * happens also when building the relation list to analyze for a manual
     * operation, and needs to be done additionally here as ANALYZE could
     * happen across multiple transactions where relation ownership could have
     * changed in-between.  Make sure to generate only logs for ANALYZE in
     * this case.
     */
    if (!vacuum_is_relation_owner(RelationGetRelid(onerel),
                                  onerel->rd_rel,
                                  params->options & VACOPT_ANALYZE))
    {
        relation_close(onerel, ShareUpdateExclusiveLock);
        return;
    }
 
    /*
     * Silently ignore tables that are temp tables of other backends ---
     * trying to analyze these is rather pointless, since their contents are
     * probably not up-to-date on disk.  (We don't throw a warning here; it
     * would just lead to chatter during a database-wide ANALYZE.)
     */
    if (RELATION_IS_OTHER_TEMP(onerel))
    {
        relation_close(onerel, ShareUpdateExclusiveLock);
        return;
    }
 
    /*
     * We can ANALYZE any table except pg_statistic. See update_attstats
     */
    if (RelationGetRelid(onerel) == StatisticRelationId)
    {
        relation_close(onerel, ShareUpdateExclusiveLock);
        return;
    }
 
    /*
     * Check that it's of an analyzable relkind, and set up appropriately.
     */
    if (onerel->rd_rel->relkind == RELKIND_RELATION ||
        onerel->rd_rel->relkind == RELKIND_MATVIEW)
    {
        /* Regular table, so we'll use the regular row acquisition function */
        acquirefunc = acquire_sample_rows;
        /* Also get regular table's size */
        relpages = RelationGetNumberOfBlocks(onerel);
    }
    else if (onerel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
    {
        /*
         * For a foreign table, call the FDW's hook function to see whether it
         * supports analysis.
         */
        FdwRoutine *fdwroutine;
        bool        ok = false;
 
        fdwroutine = GetFdwRoutineForRelation(onerel, false);
 
        if (fdwroutine->AnalyzeForeignTable != NULL)
            ok = fdwroutine->AnalyzeForeignTable(onerel,
                                                 &acquirefunc,
                                                 &relpages);
 
        if (!ok)
        {
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- cannot analyze this foreign table",
                            RelationGetRelationName(onerel))));
            relation_close(onerel, ShareUpdateExclusiveLock);
            return;
        }
    }
    else if (onerel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
    {
        /*
         * For partitioned tables, we want to do the recursive ANALYZE below.
         */
    }
    else
    {
        /* No need for a WARNING if we already complained during VACUUM */
        if (!(params->options & VACOPT_VACUUM))
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- cannot analyze non-tables or special system tables",
                            RelationGetRelationName(onerel))));
        relation_close(onerel, ShareUpdateExclusiveLock);
        return;
    }
 
    /*
     * OK, let's do it.  First, initialize progress reporting.
     */
    pgstat_progress_start_command(PROGRESS_COMMAND_ANALYZE,
                                  RelationGetRelid(onerel));
 
    /*
     * Do the normal non-recursive ANALYZE.  We can skip this for partitioned
     * tables, which don't contain any rows.
     */
    if (onerel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
        do_analyze_rel(onerel, params, va_cols, acquirefunc,
                       relpages, false, in_outer_xact, elevel);
 
    /*
     * If there are child tables, do recursive ANALYZE.
     */
    if (onerel->rd_rel->relhassubclass)
        do_analyze_rel(onerel, params, va_cols, acquirefunc, relpages,
                       true, in_outer_xact, elevel);
 
    /*
     * Close source relation now, but keep lock so that no one deletes it
     * before we commit.  (If someone did, they'd fail to clean up the entries
     * we made in pg_statistic.  Also, releasing the lock before commit would
     * expose us to concurrent-update failures in update_attstats.)
     */
    relation_close(onerel, NoLock);
 
    pgstat_progress_end_command();
}

References acquire_sample_rows(), FdwRoutine::AnalyzeForeignTable, CHECK_FOR_INTERRUPTS, DEBUG2, do_analyze_rel(), ereport, errmsg(), GetFdwRoutineForRelation(), INFO, VacuumParams::log_min_duration, NoLock, VacuumParams::options, pgstat_progress_end_command(), pgstat_progress_start_command(), PROGRESS_COMMAND_ANALYZE, RelationData::rd_rel, relation_close(), RELATION_IS_OTHER_TEMP, RelationGetNumberOfBlocks, RelationGetRelationName, RelationGetRelid, ShareUpdateExclusiveLock, vac_strategy, VACOPT_ANALYZE, VACOPT_VACUUM, VACOPT_VERBOSE, vacuum_is_relation_owner(), vacuum_open_relation(), and WARNING.

Referenced by vacuum().

anl_get_next_S()

double anl_get_next_S	(	double	t,
		int	n,
		double *	stateptr
	)

Definition at line 296 of file sampling.c.

{
    double      result;
 
    oldrs.W = *stateptr;
    result = reservoir_get_next_S(&oldrs, t, n);
    *stateptr = oldrs.W;
    return result;
}

anl_init_selection_state()

double anl_init_selection_state

(

int

n

)

Definition at line 281 of file sampling.c.

{
    /* initialize if first time through */
    if (unlikely(!oldrs_initialized))
    {
        sampler_random_init_state(pg_prng_uint32(&pg_global_prng_state),
                                  &oldrs.randstate);
        oldrs_initialized = true;
    }
 
    /* Initial value of W (for use when Algorithm Z is first applied) */
    return exp(-log(sampler_random_fract(&oldrs.randstate)) / n);
}

anl_random_fract()

double anl_random_fract

(

void

)

Definition at line 266 of file sampling.c.

{
    /* initialize if first time through */
    if (unlikely(!oldrs_initialized))
    {
        sampler_random_init_state(pg_prng_uint32(&pg_global_prng_state),
                                  &oldrs.randstate);
        oldrs_initialized = true;
    }
 
    /* and compute a random fraction */
    return sampler_random_fract(&oldrs.randstate);
}

AutoVacuumUpdateCostLimit()

void AutoVacuumUpdateCostLimit

(

void

)

Definition at line 1855 of file autovacuum.c.

{
    if (!MyWorkerInfo)
        return;
 
    /*
     * note: in cost_limit, zero also means use value from elsewhere, because
     * zero is not a valid value.
     */
 
    if (av_storage_param_cost_limit > 0)
        vacuum_cost_limit = av_storage_param_cost_limit;
    else
    {
        int         nworkers_for_balance;
 
        if (autovacuum_vac_cost_limit > 0)
            vacuum_cost_limit = autovacuum_vac_cost_limit;
        else
            vacuum_cost_limit = VacuumCostLimit;
 
        /* Only balance limit if no cost-related storage parameters specified */
        if (pg_atomic_unlocked_test_flag(&MyWorkerInfo->wi_dobalance))
            return;
 
        Assert(vacuum_cost_limit > 0);
 
        nworkers_for_balance = pg_atomic_read_u32(&AutoVacuumShmem->av_nworkersForBalance);
 
        /* There is at least 1 autovac worker (this worker) */
        if (nworkers_for_balance <= 0)
            elog(ERROR, "nworkers_for_balance must be > 0");
 
        vacuum_cost_limit = Max(vacuum_cost_limit / nworkers_for_balance, 1);
    }
}

References Assert(), autovacuum_vac_cost_limit, AutoVacuumShmem, AutoVacuumShmemStruct::av_nworkersForBalance, av_storage_param_cost_limit, elog(), ERROR, Max, MyWorkerInfo, pg_atomic_read_u32(), pg_atomic_unlocked_test_flag(), vacuum_cost_limit, VacuumCostLimit, and WorkerInfoData::wi_dobalance.

Referenced by vacuum_delay_point(), and VacuumUpdateCosts().

ExecVacuum()

void ExecVacuum	(	ParseState *	pstate,
		VacuumStmt *	vacstmt,
		bool	isTopLevel
	)

Definition at line 150 of file vacuum.c.

{
    VacuumParams params;
    BufferAccessStrategy bstrategy = NULL;
    bool        verbose = false;
    bool        skip_locked = false;
    bool        analyze = false;
    bool        freeze = false;
    bool        full = false;
    bool        disable_page_skipping = false;
    bool        process_main = true;
    bool        process_toast = true;
    int         ring_size;
    bool        skip_database_stats = false;
    bool        only_database_stats = false;
    MemoryContext vac_context;
    ListCell   *lc;
 
    /* index_cleanup and truncate values unspecified for now */
    params.index_cleanup = VACOPTVALUE_UNSPECIFIED;
    params.truncate = VACOPTVALUE_UNSPECIFIED;
 
    /* By default parallel vacuum is enabled */
    params.nworkers = 0;
 
    /*
     * Set this to an invalid value so it is clear whether or not a
     * BUFFER_USAGE_LIMIT was specified when making the access strategy.
     */
    ring_size = -1;
 
    /* Parse options list */
    foreach(lc, vacstmt->options)
    {
        DefElem    *opt = (DefElem *) lfirst(lc);
 
        /* Parse common options for VACUUM and ANALYZE */
        if (strcmp(opt->defname, "verbose") == 0)
            verbose = defGetBoolean(opt);
        else if (strcmp(opt->defname, "skip_locked") == 0)
            skip_locked = defGetBoolean(opt);
        else if (strcmp(opt->defname, "buffer_usage_limit") == 0)
        {
            const char *hintmsg;
            int         result;
            char       *vac_buffer_size;
 
            vac_buffer_size = defGetString(opt);
 
            /*
             * Check that the specified value is valid and the size falls
             * within the hard upper and lower limits if it is not 0.
             */
            if (!parse_int(vac_buffer_size, &result, GUC_UNIT_KB, &hintmsg) ||
                (result != 0 &&
                 (result < MIN_BAS_VAC_RING_SIZE_KB || result > MAX_BAS_VAC_RING_SIZE_KB)))
            {
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                         errmsg("BUFFER_USAGE_LIMIT option must be 0 or between %d kB and %d kB",
                                MIN_BAS_VAC_RING_SIZE_KB, MAX_BAS_VAC_RING_SIZE_KB),
                         hintmsg ? errhint("%s", _(hintmsg)) : 0));
            }
 
            ring_size = result;
        }
        else if (!vacstmt->is_vacuumcmd)
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("unrecognized ANALYZE option \"%s\"", opt->defname),
                     parser_errposition(pstate, opt->location)));
 
        /* Parse options available on VACUUM */
        else if (strcmp(opt->defname, "analyze") == 0)
            analyze = defGetBoolean(opt);
        else if (strcmp(opt->defname, "freeze") == 0)
            freeze = defGetBoolean(opt);
        else if (strcmp(opt->defname, "full") == 0)
            full = defGetBoolean(opt);
        else if (strcmp(opt->defname, "disable_page_skipping") == 0)
            disable_page_skipping = defGetBoolean(opt);
        else if (strcmp(opt->defname, "index_cleanup") == 0)
        {
            /* Interpret no string as the default, which is 'auto' */
            if (!opt->arg)
                params.index_cleanup = VACOPTVALUE_AUTO;
            else
            {
                char       *sval = defGetString(opt);
 
                /* Try matching on 'auto' string, or fall back on boolean */
                if (pg_strcasecmp(sval, "auto") == 0)
                    params.index_cleanup = VACOPTVALUE_AUTO;
                else
                    params.index_cleanup = get_vacoptval_from_boolean(opt);
            }
        }
        else if (strcmp(opt->defname, "process_main") == 0)
            process_main = defGetBoolean(opt);
        else if (strcmp(opt->defname, "process_toast") == 0)
            process_toast = defGetBoolean(opt);
        else if (strcmp(opt->defname, "truncate") == 0)
            params.truncate = get_vacoptval_from_boolean(opt);
        else if (strcmp(opt->defname, "parallel") == 0)
        {
            if (opt->arg == NULL)
            {
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("parallel option requires a value between 0 and %d",
                                MAX_PARALLEL_WORKER_LIMIT),
                         parser_errposition(pstate, opt->location)));
            }
            else
            {
                int         nworkers;
 
                nworkers = defGetInt32(opt);
                if (nworkers < 0 || nworkers > MAX_PARALLEL_WORKER_LIMIT)
                    ereport(ERROR,
                            (errcode(ERRCODE_SYNTAX_ERROR),
                             errmsg("parallel workers for vacuum must be between 0 and %d",
                                    MAX_PARALLEL_WORKER_LIMIT),
                             parser_errposition(pstate, opt->location)));
 
                /*
                 * Disable parallel vacuum, if user has specified parallel
                 * degree as zero.
                 */
                if (nworkers == 0)
                    params.nworkers = -1;
                else
                    params.nworkers = nworkers;
            }
        }
        else if (strcmp(opt->defname, "skip_database_stats") == 0)
            skip_database_stats = defGetBoolean(opt);
        else if (strcmp(opt->defname, "only_database_stats") == 0)
            only_database_stats = defGetBoolean(opt);
        else
            ereport(ERROR,
                    (errcode(ERRCODE_SYNTAX_ERROR),
                     errmsg("unrecognized VACUUM option \"%s\"", opt->defname),
                     parser_errposition(pstate, opt->location)));
    }
 
    /* Set vacuum options */
    params.options =
        (vacstmt->is_vacuumcmd ? VACOPT_VACUUM : VACOPT_ANALYZE) |
        (verbose ? VACOPT_VERBOSE : 0) |
        (skip_locked ? VACOPT_SKIP_LOCKED : 0) |
        (analyze ? VACOPT_ANALYZE : 0) |
        (freeze ? VACOPT_FREEZE : 0) |
        (full ? VACOPT_FULL : 0) |
        (disable_page_skipping ? VACOPT_DISABLE_PAGE_SKIPPING : 0) |
        (process_main ? VACOPT_PROCESS_MAIN : 0) |
        (process_toast ? VACOPT_PROCESS_TOAST : 0) |
        (skip_database_stats ? VACOPT_SKIP_DATABASE_STATS : 0) |
        (only_database_stats ? VACOPT_ONLY_DATABASE_STATS : 0);
 
    /* sanity checks on options */
    Assert(params.options & (VACOPT_VACUUM | VACOPT_ANALYZE));
    Assert((params.options & VACOPT_VACUUM) ||
           !(params.options & (VACOPT_FULL | VACOPT_FREEZE)));
 
    if ((params.options & VACOPT_FULL) && params.nworkers > 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("VACUUM FULL cannot be performed in parallel")));
 
    /*
     * BUFFER_USAGE_LIMIT does nothing for VACUUM (FULL) so just raise an
     * ERROR for that case.  VACUUM (FULL, ANALYZE) does make use of it, so
     * we'll permit that.
     */
    if (ring_size != -1 && (params.options & VACOPT_FULL) &&
        !(params.options & VACOPT_ANALYZE))
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("BUFFER_USAGE_LIMIT cannot be specified for VACUUM FULL")));
 
    /*
     * Make sure VACOPT_ANALYZE is specified if any column lists are present.
     */
    if (!(params.options & VACOPT_ANALYZE))
    {
        foreach(lc, vacstmt->rels)
        {
            VacuumRelation *vrel = lfirst_node(VacuumRelation, lc);
 
            if (vrel->va_cols != NIL)
                ereport(ERROR,
                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                         errmsg("ANALYZE option must be specified when a column list is provided")));
        }
    }
 
 
    /*
     * Sanity check DISABLE_PAGE_SKIPPING option.
     */
    if ((params.options & VACOPT_FULL) != 0 &&
        (params.options & VACOPT_DISABLE_PAGE_SKIPPING) != 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("VACUUM option DISABLE_PAGE_SKIPPING cannot be used with FULL")));
 
    /* sanity check for PROCESS_TOAST */
    if ((params.options & VACOPT_FULL) != 0 &&
        (params.options & VACOPT_PROCESS_TOAST) == 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("PROCESS_TOAST required with VACUUM FULL")));
 
    /* sanity check for ONLY_DATABASE_STATS */
    if (params.options & VACOPT_ONLY_DATABASE_STATS)
    {
        Assert(params.options & VACOPT_VACUUM);
        if (vacstmt->rels != NIL)
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("ONLY_DATABASE_STATS cannot be specified with a list of tables")));
        /* don't require people to turn off PROCESS_TOAST/MAIN explicitly */
        if (params.options & ~(VACOPT_VACUUM |
                               VACOPT_VERBOSE |
                               VACOPT_PROCESS_MAIN |
                               VACOPT_PROCESS_TOAST |
                               VACOPT_ONLY_DATABASE_STATS))
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("ONLY_DATABASE_STATS cannot be specified with other VACUUM options")));
    }
 
    /*
     * All freeze ages are zero if the FREEZE option is given; otherwise pass
     * them as -1 which means to use the default values.
     */
    if (params.options & VACOPT_FREEZE)
    {
        params.freeze_min_age = 0;
        params.freeze_table_age = 0;
        params.multixact_freeze_min_age = 0;
        params.multixact_freeze_table_age = 0;
    }
    else
    {
        params.freeze_min_age = -1;
        params.freeze_table_age = -1;
        params.multixact_freeze_min_age = -1;
        params.multixact_freeze_table_age = -1;
    }
 
    /* user-invoked vacuum is never "for wraparound" */
    params.is_wraparound = false;
 
    /* user-invoked vacuum uses VACOPT_VERBOSE instead of log_min_duration */
    params.log_min_duration = -1;
 
    /*
     * Create special memory context for cross-transaction storage.
     *
     * Since it is a child of PortalContext, it will go away eventually even
     * if we suffer an error; there's no need for special abort cleanup logic.
     */
    vac_context = AllocSetContextCreate(PortalContext,
                                        "Vacuum",
                                        ALLOCSET_DEFAULT_SIZES);
 
    /*
     * Make a buffer strategy object in the cross-transaction memory context.
     * We needn't bother making this for VACUUM (FULL) or VACUUM
     * (ONLY_DATABASE_STATS) as they'll not make use of it.  VACUUM (FULL,
     * ANALYZE) is possible, so we'd better ensure that we make a strategy
     * when we see ANALYZE.
     */
    if ((params.options & (VACOPT_ONLY_DATABASE_STATS |
                           VACOPT_FULL)) == 0 ||
        (params.options & VACOPT_ANALYZE) != 0)
    {
 
        MemoryContext old_context = MemoryContextSwitchTo(vac_context);
 
        Assert(ring_size >= -1);
 
        /*
         * If BUFFER_USAGE_LIMIT was specified by the VACUUM or ANALYZE
         * command, it overrides the value of VacuumBufferUsageLimit.  Either
         * value may be 0, in which case GetAccessStrategyWithSize() will
         * return NULL, effectively allowing full use of shared buffers.
         */
        if (ring_size == -1)
            ring_size = VacuumBufferUsageLimit;
 
        bstrategy = GetAccessStrategyWithSize(BAS_VACUUM, ring_size);
 
        MemoryContextSwitchTo(old_context);
    }
 
    /* Now go through the common routine */
    vacuum(vacstmt->rels, &params, bstrategy, vac_context, isTopLevel);
 
    /* Finally, clean up the vacuum memory context */
    MemoryContextDelete(vac_context);
}

References _, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, analyze(), DefElem::arg, Assert(), BAS_VACUUM, defGetBoolean(), defGetInt32(), defGetString(), DefElem::defname, ereport, errcode(), errhint(), errmsg(), ERROR, VacuumParams::freeze_min_age, VacuumParams::freeze_table_age, get_vacoptval_from_boolean(), GetAccessStrategyWithSize(), GUC_UNIT_KB, VacuumParams::index_cleanup, VacuumStmt::is_vacuumcmd, VacuumParams::is_wraparound, lfirst, lfirst_node, DefElem::location, VacuumParams::log_min_duration, MAX_BAS_VAC_RING_SIZE_KB, MAX_PARALLEL_WORKER_LIMIT, MemoryContextDelete(), MemoryContextSwitchTo(), MIN_BAS_VAC_RING_SIZE_KB, VacuumParams::multixact_freeze_min_age, VacuumParams::multixact_freeze_table_age, NIL, VacuumParams::nworkers, VacuumParams::options, VacuumStmt::options, parse_int(), parser_errposition(), pg_strcasecmp(), PortalContext, VacuumStmt::rels, VacuumParams::truncate, VacuumRelation::va_cols, VACOPT_ANALYZE, VACOPT_DISABLE_PAGE_SKIPPING, VACOPT_FREEZE, VACOPT_FULL, VACOPT_ONLY_DATABASE_STATS, VACOPT_PROCESS_MAIN, VACOPT_PROCESS_TOAST, VACOPT_SKIP_DATABASE_STATS, VACOPT_SKIP_LOCKED, VACOPT_VACUUM, VACOPT_VERBOSE, VACOPTVALUE_AUTO, VACOPTVALUE_UNSPECIFIED, vacuum(), VacuumBufferUsageLimit, and verbose.

Referenced by standard_ProcessUtility().

parallel_vacuum_bulkdel_all_indexes()

void parallel_vacuum_bulkdel_all_indexes	(	ParallelVacuumState *	pvs,
		long	num_table_tuples,
		int	num_index_scans
	)

Definition at line 469 of file vacuumparallel.c.

{
    Assert(!IsParallelWorker());
 
    /*
     * We can only provide an approximate value of num_heap_tuples, at least
     * for now.
     */
    pvs->shared->reltuples = num_table_tuples;
    pvs->shared->estimated_count = true;
 
    parallel_vacuum_process_all_indexes(pvs, num_index_scans, true);
}

References Assert(), PVShared::estimated_count, IsParallelWorker, parallel_vacuum_process_all_indexes(), PVShared::reltuples, and ParallelVacuumState::shared.

Referenced by lazy_vacuum_all_indexes().

parallel_vacuum_cleanup_all_indexes()

void parallel_vacuum_cleanup_all_indexes	(	ParallelVacuumState *	pvs,
		long	num_table_tuples,
		int	num_index_scans,
		bool	estimated_count
	)

Definition at line 488 of file vacuumparallel.c.

{
    Assert(!IsParallelWorker());
 
    /*
     * We can provide a better estimate of total number of surviving tuples
     * (we assume indexes are more interested in that than in the number of
     * nominally live tuples).
     */
    pvs->shared->reltuples = num_table_tuples;
    pvs->shared->estimated_count = estimated_count;
 
    parallel_vacuum_process_all_indexes(pvs, num_index_scans, false);
}

References Assert(), PVShared::estimated_count, IsParallelWorker, parallel_vacuum_process_all_indexes(), PVShared::reltuples, and ParallelVacuumState::shared.

Referenced by lazy_cleanup_all_indexes().

parallel_vacuum_end()

void parallel_vacuum_end	(	ParallelVacuumState *	pvs,
		IndexBulkDeleteResult **	istats
	)

Definition at line 433 of file vacuumparallel.c.

{
    Assert(!IsParallelWorker());
 
    /* Copy the updated statistics */
    for (int i = 0; i < pvs->nindexes; i++)
    {
        PVIndStats *indstats = &(pvs->indstats[i]);
 
        if (indstats->istat_updated)
        {
            istats[i] = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
            memcpy(istats[i], &indstats->istat, sizeof(IndexBulkDeleteResult));
        }
        else
            istats[i] = NULL;
    }
 
    DestroyParallelContext(pvs->pcxt);
    ExitParallelMode();
 
    pfree(pvs->will_parallel_vacuum);
    pfree(pvs);
}

References Assert(), DestroyParallelContext(), ExitParallelMode(), i, ParallelVacuumState::indstats, IsParallelWorker, PVIndStats::istat, PVIndStats::istat_updated, ParallelVacuumState::nindexes, palloc0(), ParallelVacuumState::pcxt, pfree(), and ParallelVacuumState::will_parallel_vacuum.

Referenced by dead_items_cleanup().

parallel_vacuum_get_dead_items()

VacDeadItems* parallel_vacuum_get_dead_items

(

ParallelVacuumState *

pvs

)

Definition at line 460 of file vacuumparallel.c.

{
    return pvs->dead_items;
}

References ParallelVacuumState::dead_items.

Referenced by dead_items_alloc().

parallel_vacuum_init()

ParallelVacuumState* parallel_vacuum_init	(	Relation	rel,
		Relation *	indrels,
		int	nindexes,
		int	nrequested_workers,
		int	max_items,
		int	elevel,
		BufferAccessStrategy	bstrategy
	)

Definition at line 234 of file vacuumparallel.c.

{
    ParallelVacuumState *pvs;
    ParallelContext *pcxt;
    PVShared   *shared;
    VacDeadItems *dead_items;
    PVIndStats *indstats;
    BufferUsage *buffer_usage;
    WalUsage   *wal_usage;
    bool       *will_parallel_vacuum;
    Size        est_indstats_len;
    Size        est_shared_len;
    Size        est_dead_items_len;
    int         nindexes_mwm = 0;
    int         parallel_workers = 0;
    int         querylen;
 
    /*
     * A parallel vacuum must be requested and there must be indexes on the
     * relation
     */
    Assert(nrequested_workers >= 0);
    Assert(nindexes > 0);
 
    /*
     * Compute the number of parallel vacuum workers to launch
     */
    will_parallel_vacuum = (bool *) palloc0(sizeof(bool) * nindexes);
    parallel_workers = parallel_vacuum_compute_workers(indrels, nindexes,
                                                       nrequested_workers,
                                                       will_parallel_vacuum);
    if (parallel_workers <= 0)
    {
        /* Can't perform vacuum in parallel -- return NULL */
        pfree(will_parallel_vacuum);
        return NULL;
    }
 
    pvs = (ParallelVacuumState *) palloc0(sizeof(ParallelVacuumState));
    pvs->indrels = indrels;
    pvs->nindexes = nindexes;
    pvs->will_parallel_vacuum = will_parallel_vacuum;
    pvs->bstrategy = bstrategy;
    pvs->heaprel = rel;
 
    EnterParallelMode();
    pcxt = CreateParallelContext("postgres", "parallel_vacuum_main",
                                 parallel_workers);
    Assert(pcxt->nworkers > 0);
    pvs->pcxt = pcxt;
 
    /* Estimate size for index vacuum stats -- PARALLEL_VACUUM_KEY_INDEX_STATS */
    est_indstats_len = mul_size(sizeof(PVIndStats), nindexes);
    shm_toc_estimate_chunk(&pcxt->estimator, est_indstats_len);
    shm_toc_estimate_keys(&pcxt->estimator, 1);
 
    /* Estimate size for shared information -- PARALLEL_VACUUM_KEY_SHARED */
    est_shared_len = sizeof(PVShared);
    shm_toc_estimate_chunk(&pcxt->estimator, est_shared_len);
    shm_toc_estimate_keys(&pcxt->estimator, 1);
 
    /* Estimate size for dead_items -- PARALLEL_VACUUM_KEY_DEAD_ITEMS */
    est_dead_items_len = vac_max_items_to_alloc_size(max_items);
    shm_toc_estimate_chunk(&pcxt->estimator, est_dead_items_len);
    shm_toc_estimate_keys(&pcxt->estimator, 1);
 
    /*
     * Estimate space for BufferUsage and WalUsage --
     * PARALLEL_VACUUM_KEY_BUFFER_USAGE and PARALLEL_VACUUM_KEY_WAL_USAGE.
     *
     * If there are no extensions loaded that care, we could skip this.  We
     * have no way of knowing whether anyone's looking at pgBufferUsage or
     * pgWalUsage, so do it unconditionally.
     */
    shm_toc_estimate_chunk(&pcxt->estimator,
                           mul_size(sizeof(BufferUsage), pcxt->nworkers));
    shm_toc_estimate_keys(&pcxt->estimator, 1);
    shm_toc_estimate_chunk(&pcxt->estimator,
                           mul_size(sizeof(WalUsage), pcxt->nworkers));
    shm_toc_estimate_keys(&pcxt->estimator, 1);
 
    /* Finally, estimate PARALLEL_VACUUM_KEY_QUERY_TEXT space */
    if (debug_query_string)
    {
        querylen = strlen(debug_query_string);
        shm_toc_estimate_chunk(&pcxt->estimator, querylen + 1);
        shm_toc_estimate_keys(&pcxt->estimator, 1);
    }
    else
        querylen = 0;           /* keep compiler quiet */
 
    InitializeParallelDSM(pcxt);
 
    /* Prepare index vacuum stats */
    indstats = (PVIndStats *) shm_toc_allocate(pcxt->toc, est_indstats_len);
    MemSet(indstats, 0, est_indstats_len);
    for (int i = 0; i < nindexes; i++)
    {
        Relation    indrel = indrels[i];
        uint8       vacoptions = indrel->rd_indam->amparallelvacuumoptions;
 
        /*
         * Cleanup option should be either disabled, always performing in
         * parallel or conditionally performing in parallel.
         */
        Assert(((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) == 0) ||
               ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) == 0));
        Assert(vacoptions <= VACUUM_OPTION_MAX_VALID_VALUE);
 
        if (!will_parallel_vacuum[i])
            continue;
 
        if (indrel->rd_indam->amusemaintenanceworkmem)
            nindexes_mwm++;
 
        /*
         * Remember the number of indexes that support parallel operation for
         * each phase.
         */
        if ((vacoptions & VACUUM_OPTION_PARALLEL_BULKDEL) != 0)
            pvs->nindexes_parallel_bulkdel++;
        if ((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) != 0)
            pvs->nindexes_parallel_cleanup++;
        if ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) != 0)
            pvs->nindexes_parallel_condcleanup++;
    }
    shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_INDEX_STATS, indstats);
    pvs->indstats = indstats;
 
    /* Prepare shared information */
    shared = (PVShared *) shm_toc_allocate(pcxt->toc, est_shared_len);
    MemSet(shared, 0, est_shared_len);
    shared->relid = RelationGetRelid(rel);
    shared->elevel = elevel;
    shared->maintenance_work_mem_worker =
        (nindexes_mwm > 0) ?
        maintenance_work_mem / Min(parallel_workers, nindexes_mwm) :
        maintenance_work_mem;
 
    /* Use the same buffer size for all workers */
    shared->ring_nbuffers = GetAccessStrategyBufferCount(bstrategy);
 
    pg_atomic_init_u32(&(shared->cost_balance), 0);
    pg_atomic_init_u32(&(shared->active_nworkers), 0);
    pg_atomic_init_u32(&(shared->idx), 0);
 
    shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_SHARED, shared);
    pvs->shared = shared;
 
    /* Prepare the dead_items space */
    dead_items = (VacDeadItems *) shm_toc_allocate(pcxt->toc,
                                                   est_dead_items_len);
    dead_items->max_items = max_items;
    dead_items->num_items = 0;
    MemSet(dead_items->items, 0, sizeof(ItemPointerData) * max_items);
    shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_DEAD_ITEMS, dead_items);
    pvs->dead_items = dead_items;
 
    /*
     * Allocate space for each worker's BufferUsage and WalUsage; no need to
     * initialize
     */
    buffer_usage = shm_toc_allocate(pcxt->toc,
                                    mul_size(sizeof(BufferUsage), pcxt->nworkers));
    shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_BUFFER_USAGE, buffer_usage);
    pvs->buffer_usage = buffer_usage;
    wal_usage = shm_toc_allocate(pcxt->toc,
                                 mul_size(sizeof(WalUsage), pcxt->nworkers));
    shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_WAL_USAGE, wal_usage);
    pvs->wal_usage = wal_usage;
 
    /* Store query string for workers */
    if (debug_query_string)
    {
        char       *sharedquery;
 
        sharedquery = (char *) shm_toc_allocate(pcxt->toc, querylen + 1);
        memcpy(sharedquery, debug_query_string, querylen + 1);
        sharedquery[querylen] = '\0';
        shm_toc_insert(pcxt->toc,
                       PARALLEL_VACUUM_KEY_QUERY_TEXT, sharedquery);
    }
 
    /* Success -- return parallel vacuum state */
    return pvs;
}

References PVShared::active_nworkers, IndexAmRoutine::amparallelvacuumoptions, IndexAmRoutine::amusemaintenanceworkmem, Assert(), ParallelVacuumState::bstrategy, ParallelVacuumState::buffer_usage, PVShared::cost_balance, CreateParallelContext(), ParallelVacuumState::dead_items, debug_query_string, PVShared::elevel, EnterParallelMode(), ParallelContext::estimator, GetAccessStrategyBufferCount(), ParallelVacuumState::heaprel, i, PVShared::idx, ParallelVacuumState::indrels, ParallelVacuumState::indstats, InitializeParallelDSM(), VacDeadItems::items, maintenance_work_mem, PVShared::maintenance_work_mem_worker, VacDeadItems::max_items, MemSet, Min, mul_size(), ParallelVacuumState::nindexes, ParallelVacuumState::nindexes_parallel_bulkdel, ParallelVacuumState::nindexes_parallel_cleanup, ParallelVacuumState::nindexes_parallel_condcleanup, VacDeadItems::num_items, ParallelContext::nworkers, palloc0(), parallel_vacuum_compute_workers(), PARALLEL_VACUUM_KEY_BUFFER_USAGE, PARALLEL_VACUUM_KEY_DEAD_ITEMS, PARALLEL_VACUUM_KEY_INDEX_STATS, PARALLEL_VACUUM_KEY_QUERY_TEXT, PARALLEL_VACUUM_KEY_SHARED, PARALLEL_VACUUM_KEY_WAL_USAGE, ParallelVacuumState::pcxt, pfree(), pg_atomic_init_u32(), RelationData::rd_indam, RelationGetRelid, PVShared::relid, PVShared::ring_nbuffers, ParallelVacuumState::shared, shm_toc_allocate(), shm_toc_estimate_chunk, shm_toc_estimate_keys, shm_toc_insert(), ParallelContext::toc, vac_max_items_to_alloc_size(), VACUUM_OPTION_MAX_VALID_VALUE, VACUUM_OPTION_PARALLEL_BULKDEL, VACUUM_OPTION_PARALLEL_CLEANUP, VACUUM_OPTION_PARALLEL_COND_CLEANUP, ParallelVacuumState::wal_usage, and ParallelVacuumState::will_parallel_vacuum.

Referenced by dead_items_alloc().

parallel_vacuum_main()

void parallel_vacuum_main	(	dsm_segment *	seg,
		shm_toc *	toc
	)

Definition at line 957 of file vacuumparallel.c.

{
    ParallelVacuumState pvs;
    Relation    rel;
    Relation   *indrels;
    PVIndStats *indstats;
    PVShared   *shared;
    VacDeadItems *dead_items;
    BufferUsage *buffer_usage;
    WalUsage   *wal_usage;
    int         nindexes;
    char       *sharedquery;
    ErrorContextCallback errcallback;
 
    /*
     * A parallel vacuum worker must have only PROC_IN_VACUUM flag since we
     * don't support parallel vacuum for autovacuum as of now.
     */
    Assert(MyProc->statusFlags == PROC_IN_VACUUM);
 
    elog(DEBUG1, "starting parallel vacuum worker");
 
    shared = (PVShared *) shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_SHARED, false);
 
    /* Set debug_query_string for individual workers */
    sharedquery = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_QUERY_TEXT, true);
    debug_query_string = sharedquery;
    pgstat_report_activity(STATE_RUNNING, debug_query_string);
 
    /*
     * Open table.  The lock mode is the same as the leader process.  It's
     * okay because the lock mode does not conflict among the parallel
     * workers.
     */
    rel = table_open(shared->relid, ShareUpdateExclusiveLock);
 
    /*
     * Open all indexes. indrels are sorted in order by OID, which should be
     * matched to the leader's one.
     */
    vac_open_indexes(rel, RowExclusiveLock, &nindexes, &indrels);
    Assert(nindexes > 0);
 
    if (shared->maintenance_work_mem_worker > 0)
        maintenance_work_mem = shared->maintenance_work_mem_worker;
 
    /* Set index statistics */
    indstats = (PVIndStats *) shm_toc_lookup(toc,
                                             PARALLEL_VACUUM_KEY_INDEX_STATS,
                                             false);
 
    /* Set dead_items space */
    dead_items = (VacDeadItems *) shm_toc_lookup(toc,
                                                 PARALLEL_VACUUM_KEY_DEAD_ITEMS,
                                                 false);
 
    /* Set cost-based vacuum delay */
    VacuumUpdateCosts();
    VacuumCostBalance = 0;
    VacuumPageHit = 0;
    VacuumPageMiss = 0;
    VacuumPageDirty = 0;
    VacuumCostBalanceLocal = 0;
    VacuumSharedCostBalance = &(shared->cost_balance);
    VacuumActiveNWorkers = &(shared->active_nworkers);
 
    /* Set parallel vacuum state */
    pvs.indrels = indrels;
    pvs.nindexes = nindexes;
    pvs.indstats = indstats;
    pvs.shared = shared;
    pvs.dead_items = dead_items;
    pvs.relnamespace = get_namespace_name(RelationGetNamespace(rel));
    pvs.relname = pstrdup(RelationGetRelationName(rel));
    pvs.heaprel = rel;
 
    /* These fields will be filled during index vacuum or cleanup */
    pvs.indname = NULL;
    pvs.status = PARALLEL_INDVAC_STATUS_INITIAL;
 
    /* Each parallel VACUUM worker gets its own access strategy. */
    pvs.bstrategy = GetAccessStrategyWithSize(BAS_VACUUM,
                                              shared->ring_nbuffers * (BLCKSZ / 1024));
 
    /* Setup error traceback support for ereport() */
    errcallback.callback = parallel_vacuum_error_callback;
    errcallback.arg = &pvs;
    errcallback.previous = error_context_stack;
    error_context_stack = &errcallback;
 
    /* Prepare to track buffer usage during parallel execution */
    InstrStartParallelQuery();
 
    /* Process indexes to perform vacuum/cleanup */
    parallel_vacuum_process_safe_indexes(&pvs);
 
    /* Report buffer/WAL usage during parallel execution */
    buffer_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_BUFFER_USAGE, false);
    wal_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_WAL_USAGE, false);
    InstrEndParallelQuery(&buffer_usage[ParallelWorkerNumber],
                          &wal_usage[ParallelWorkerNumber]);
 
    /* Pop the error context stack */
    error_context_stack = errcallback.previous;
 
    vac_close_indexes(nindexes, indrels, RowExclusiveLock);
    table_close(rel, ShareUpdateExclusiveLock);
    FreeAccessStrategy(pvs.bstrategy);
}

References PVShared::active_nworkers, ErrorContextCallback::arg, Assert(), BAS_VACUUM, ParallelVacuumState::bstrategy, ErrorContextCallback::callback, PVShared::cost_balance, ParallelVacuumState::dead_items, DEBUG1, debug_query_string, elog(), error_context_stack, FreeAccessStrategy(), get_namespace_name(), GetAccessStrategyWithSize(), ParallelVacuumState::heaprel, ParallelVacuumState::indname, ParallelVacuumState::indrels, ParallelVacuumState::indstats, InstrEndParallelQuery(), InstrStartParallelQuery(), maintenance_work_mem, PVShared::maintenance_work_mem_worker, MyProc, ParallelVacuumState::nindexes, PARALLEL_INDVAC_STATUS_INITIAL, parallel_vacuum_error_callback(), PARALLEL_VACUUM_KEY_BUFFER_USAGE, PARALLEL_VACUUM_KEY_DEAD_ITEMS, PARALLEL_VACUUM_KEY_INDEX_STATS, PARALLEL_VACUUM_KEY_QUERY_TEXT, PARALLEL_VACUUM_KEY_SHARED, PARALLEL_VACUUM_KEY_WAL_USAGE, parallel_vacuum_process_safe_indexes(), ParallelWorkerNumber, pgstat_report_activity(), ErrorContextCallback::previous, PROC_IN_VACUUM, pstrdup(), RelationGetNamespace, RelationGetRelationName, PVShared::relid, ParallelVacuumState::relname, ParallelVacuumState::relnamespace, PVShared::ring_nbuffers, RowExclusiveLock, ParallelVacuumState::shared, ShareUpdateExclusiveLock, shm_toc_lookup(), STATE_RUNNING, ParallelVacuumState::status, PGPROC::statusFlags, table_close(), table_open(), vac_close_indexes(), vac_open_indexes(), VacuumActiveNWorkers, VacuumCostBalance, VacuumCostBalanceLocal, VacuumPageDirty, VacuumPageHit, VacuumPageMiss, VacuumSharedCostBalance, and VacuumUpdateCosts().

std_typanalyze()

bool std_typanalyze

(

VacAttrStats *

stats

)

Definition at line 1876 of file analyze.c.

{
    Oid         ltopr;
    Oid         eqopr;
    StdAnalyzeData *mystats;
 
    /* If the attstattarget column is negative, use the default value */
    if (stats->attstattarget < 0)
        stats->attstattarget = default_statistics_target;
 
    /* Look for default "<" and "=" operators for column's type */
    get_sort_group_operators(stats->attrtypid,
                             false, false, false,
                             &ltopr, &eqopr, NULL,
                             NULL);
 
    /* Save the operator info for compute_stats routines */
    mystats = (StdAnalyzeData *) palloc(sizeof(StdAnalyzeData));
    mystats->eqopr = eqopr;
    mystats->eqfunc = OidIsValid(eqopr) ? get_opcode(eqopr) : InvalidOid;
    mystats->ltopr = ltopr;
    stats->extra_data = mystats;
 
    /*
     * Determine which standard statistics algorithm to use
     */
    if (OidIsValid(eqopr) && OidIsValid(ltopr))
    {
        /* Seems to be a scalar datatype */
        stats->compute_stats = compute_scalar_stats;
        /*--------------------
         * The following choice of minrows is based on the paper
         * "Random sampling for histogram construction: how much is enough?"
         * by Surajit Chaudhuri, Rajeev Motwani and Vivek Narasayya, in
         * Proceedings of ACM SIGMOD International Conference on Management
         * of Data, 1998, Pages 436-447.  Their Corollary 1 to Theorem 5
         * says that for table size n, histogram size k, maximum relative
         * error in bin size f, and error probability gamma, the minimum
         * random sample size is
         *      r = 4 * k * ln(2*n/gamma) / f^2
         * Taking f = 0.5, gamma = 0.01, n = 10^6 rows, we obtain
         *      r = 305.82 * k
         * Note that because of the log function, the dependence on n is
         * quite weak; even at n = 10^12, a 300*k sample gives <= 0.66
         * bin size error with probability 0.99.  So there's no real need to
         * scale for n, which is a good thing because we don't necessarily
         * know it at this point.
         *--------------------
         */
        stats->minrows = 300 * stats->attstattarget;
    }
    else if (OidIsValid(eqopr))
    {
        /* We can still recognize distinct values */
        stats->compute_stats = compute_distinct_stats;
        /* Might as well use the same minrows as above */
        stats->minrows = 300 * stats->attstattarget;
    }
    else
    {
        /* Can't do much but the trivial stuff */
        stats->compute_stats = compute_trivial_stats;
        /* Might as well use the same minrows as above */
        stats->minrows = 300 * stats->attstattarget;
    }
 
    return true;
}

References VacAttrStats::attrtypid, VacAttrStats::attstattarget, compute_distinct_stats(), compute_scalar_stats(), VacAttrStats::compute_stats, compute_trivial_stats(), default_statistics_target, StdAnalyzeData::eqfunc, StdAnalyzeData::eqopr, VacAttrStats::extra_data, get_opcode(), get_sort_group_operators(), InvalidOid, StdAnalyzeData::ltopr, VacAttrStats::minrows, OidIsValid, and palloc().

Referenced by array_typanalyze(), examine_attribute(), and examine_expression().

vac_bulkdel_one_index()

IndexBulkDeleteResult* vac_bulkdel_one_index	(	IndexVacuumInfo *	ivinfo,
		IndexBulkDeleteResult *	istat,
		VacDeadItems *	dead_items
	)

Definition at line 2476 of file vacuum.c.

{
    /* Do bulk deletion */
    istat = index_bulk_delete(ivinfo, istat, vac_tid_reaped,
                              (void *) dead_items);
 
    ereport(ivinfo->message_level,
            (errmsg("scanned index \"%s\" to remove %d row versions",
                    RelationGetRelationName(ivinfo->index),
                    dead_items->num_items)));
 
    return istat;
}

References ereport, errmsg(), IndexVacuumInfo::index, index_bulk_delete(), IndexVacuumInfo::message_level, VacDeadItems::num_items, RelationGetRelationName, and vac_tid_reaped().

Referenced by lazy_vacuum_one_index(), and parallel_vacuum_process_one_index().

vac_cleanup_one_index()

IndexBulkDeleteResult* vac_cleanup_one_index	(	IndexVacuumInfo *	ivinfo,
		IndexBulkDeleteResult *	istat
	)

Definition at line 2497 of file vacuum.c.

{
    istat = index_vacuum_cleanup(ivinfo, istat);
 
    if (istat)
        ereport(ivinfo->message_level,
                (errmsg("index \"%s\" now contains %.0f row versions in %u pages",
                        RelationGetRelationName(ivinfo->index),
                        istat->num_index_tuples,
                        istat->num_pages),
                 errdetail("%.0f index row versions were removed.\n"
                           "%u index pages were newly deleted.\n"
                           "%u index pages are currently deleted, of which %u are currently reusable.",
                           istat->tuples_removed,
                           istat->pages_newly_deleted,
                           istat->pages_deleted, istat->pages_free)));
 
    return istat;
}

References ereport, errdetail(), errmsg(), IndexVacuumInfo::index, index_vacuum_cleanup(), IndexVacuumInfo::message_level, IndexBulkDeleteResult::num_index_tuples, IndexBulkDeleteResult::num_pages, IndexBulkDeleteResult::pages_deleted, IndexBulkDeleteResult::pages_free, IndexBulkDeleteResult::pages_newly_deleted, RelationGetRelationName, and IndexBulkDeleteResult::tuples_removed.

Referenced by lazy_cleanup_one_index(), and parallel_vacuum_process_one_index().

vac_close_indexes()

void vac_close_indexes	(	int	nindexes,
		Relation *	Irel,
		LOCKMODE	lockmode
	)

Definition at line 2301 of file vacuum.c.

{
    if (Irel == NULL)
        return;
 
    while (nindexes--)
    {
        Relation    ind = Irel[nindexes];
 
        index_close(ind, lockmode);
    }
    pfree(Irel);
}

References index_close(), and pfree().

Referenced by do_analyze_rel(), heap_vacuum_rel(), and parallel_vacuum_main().

vac_estimate_reltuples()

double vac_estimate_reltuples	(	Relation	relation,
		BlockNumber	total_pages,
		BlockNumber	scanned_pages,
		double	scanned_tuples
	)

Definition at line 1305 of file vacuum.c.

{
    BlockNumber old_rel_pages = relation->rd_rel->relpages;
    double      old_rel_tuples = relation->rd_rel->reltuples;
    double      old_density;
    double      unscanned_pages;
    double      total_tuples;
 
    /* If we did scan the whole table, just use the count as-is */
    if (scanned_pages >= total_pages)
        return scanned_tuples;
 
    /*
     * When successive VACUUM commands scan the same few pages again and
     * again, without anything from the table really changing, there is a risk
     * that our beliefs about tuple density will gradually become distorted.
     * This might be caused by vacuumlazy.c implementation details, such as
     * its tendency to always scan the last heap page.  Handle that here.
     *
     * If the relation is _exactly_ the same size according to the existing
     * pg_class entry, and only a few of its pages (less than 2%) were
     * scanned, keep the existing value of reltuples.  Also keep the existing
     * value when only a subset of rel's pages <= a single page were scanned.
     *
     * (Note: we might be returning -1 here.)
     */
    if (old_rel_pages == total_pages &&
        scanned_pages < (double) total_pages * 0.02)
        return old_rel_tuples;
    if (scanned_pages <= 1)
        return old_rel_tuples;
 
    /*
     * If old density is unknown, we can't do much except scale up
     * scanned_tuples to match total_pages.
     */
    if (old_rel_tuples < 0 || old_rel_pages == 0)
        return floor((scanned_tuples / scanned_pages) * total_pages + 0.5);
 
    /*
     * Okay, we've covered the corner cases.  The normal calculation is to
     * convert the old measurement to a density (tuples per page), then
     * estimate the number of tuples in the unscanned pages using that figure,
     * and finally add on the number of tuples in the scanned pages.
     */
    old_density = old_rel_tuples / old_rel_pages;
    unscanned_pages = (double) total_pages - (double) scanned_pages;
    total_tuples = old_density * unscanned_pages + scanned_tuples;
    return floor(total_tuples + 0.5);
}

References RelationData::rd_rel.

Referenced by lazy_scan_heap(), and statapprox_heap().

vac_max_items_to_alloc_size()

Size vac_max_items_to_alloc_size

(

int

max_items

)

Definition at line 2522 of file vacuum.c.

{
    Assert(max_items <= MAXDEADITEMS(MaxAllocSize));
 
    return offsetof(VacDeadItems, items) + sizeof(ItemPointerData) * max_items;
}

References Assert(), MaxAllocSize, and MAXDEADITEMS.

Referenced by dead_items_alloc(), and parallel_vacuum_init().

vac_open_indexes()

void vac_open_indexes	(	Relation	relation,
		LOCKMODE	lockmode,
		int *	nindexes,
		Relation **	Irel
	)

Definition at line 2258 of file vacuum.c.

{
    List       *indexoidlist;
    ListCell   *indexoidscan;
    int         i;
 
    Assert(lockmode != NoLock);
 
    indexoidlist = RelationGetIndexList(relation);
 
    /* allocate enough memory for all indexes */
    i = list_length(indexoidlist);
 
    if (i > 0)
        *Irel = (Relation *) palloc(i * sizeof(Relation));
    else
        *Irel = NULL;
 
    /* collect just the ready indexes */
    i = 0;
    foreach(indexoidscan, indexoidlist)
    {
        Oid         indexoid = lfirst_oid(indexoidscan);
        Relation    indrel;
 
        indrel = index_open(indexoid, lockmode);
        if (indrel->rd_index->indisready)
            (*Irel)[i++] = indrel;
        else
            index_close(indrel, lockmode);
    }
 
    *nindexes = i;
 
    list_free(indexoidlist);
}

References Assert(), i, index_close(), index_open(), lfirst_oid, list_free(), list_length(), NoLock, palloc(), RelationData::rd_index, and RelationGetIndexList().

Referenced by do_analyze_rel(), heap_vacuum_rel(), and parallel_vacuum_main().

vac_update_datfrozenxid()

void vac_update_datfrozenxid

(

void

)

Definition at line 1568 of file vacuum.c.

{
    HeapTuple   tuple;
    Form_pg_database dbform;
    Relation    relation;
    SysScanDesc scan;
    HeapTuple   classTup;
    TransactionId newFrozenXid;
    MultiXactId newMinMulti;
    TransactionId lastSaneFrozenXid;
    MultiXactId lastSaneMinMulti;
    bool        bogus = false;
    bool        dirty = false;
    ScanKeyData key[1];
 
    /*
     * Restrict this task to one backend per database.  This avoids race
     * conditions that would move datfrozenxid or datminmxid backward.  It
     * avoids calling vac_truncate_clog() with a datfrozenxid preceding a
     * datfrozenxid passed to an earlier vac_truncate_clog() call.
     */
    LockDatabaseFrozenIds(ExclusiveLock);
 
    /*
     * Initialize the "min" calculation with
     * GetOldestNonRemovableTransactionId(), which is a reasonable
     * approximation to the minimum relfrozenxid for not-yet-committed
     * pg_class entries for new tables; see AddNewRelationTuple().  So we
     * cannot produce a wrong minimum by starting with this.
     */
    newFrozenXid = GetOldestNonRemovableTransactionId(NULL);
 
    /*
     * Similarly, initialize the MultiXact "min" with the value that would be
     * used on pg_class for new tables.  See AddNewRelationTuple().
     */
    newMinMulti = GetOldestMultiXactId();
 
    /*
     * Identify the latest relfrozenxid and relminmxid values that we could
     * validly see during the scan.  These are conservative values, but it's
     * not really worth trying to be more exact.
     */
    lastSaneFrozenXid = ReadNextTransactionId();
    lastSaneMinMulti = ReadNextMultiXactId();
 
    /*
     * We must seqscan pg_class to find the minimum Xid, because there is no
     * index that can help us here.
     */
    relation = table_open(RelationRelationId, AccessShareLock);
 
    scan = systable_beginscan(relation, InvalidOid, false,
                              NULL, 0, NULL);
 
    while ((classTup = systable_getnext(scan)) != NULL)
    {
        Form_pg_class classForm = (Form_pg_class) GETSTRUCT(classTup);
 
        /*
         * Only consider relations able to hold unfrozen XIDs (anything else
         * should have InvalidTransactionId in relfrozenxid anyway).
         */
        if (classForm->relkind != RELKIND_RELATION &&
            classForm->relkind != RELKIND_MATVIEW &&
            classForm->relkind != RELKIND_TOASTVALUE)
        {
            Assert(!TransactionIdIsValid(classForm->relfrozenxid));
            Assert(!MultiXactIdIsValid(classForm->relminmxid));
            continue;
        }
 
        /*
         * Some table AMs might not need per-relation xid / multixid horizons.
         * It therefore seems reasonable to allow relfrozenxid and relminmxid
         * to not be set (i.e. set to their respective Invalid*Id)
         * independently. Thus validate and compute horizon for each only if
         * set.
         *
         * If things are working properly, no relation should have a
         * relfrozenxid or relminmxid that is "in the future".  However, such
         * cases have been known to arise due to bugs in pg_upgrade.  If we
         * see any entries that are "in the future", chicken out and don't do
         * anything.  This ensures we won't truncate clog & multixact SLRUs
         * before those relations have been scanned and cleaned up.
         */
 
        if (TransactionIdIsValid(classForm->relfrozenxid))
        {
            Assert(TransactionIdIsNormal(classForm->relfrozenxid));
 
            /* check for values in the future */
            if (TransactionIdPrecedes(lastSaneFrozenXid, classForm->relfrozenxid))
            {
                bogus = true;
                break;
            }
 
            /* determine new horizon */
            if (TransactionIdPrecedes(classForm->relfrozenxid, newFrozenXid))
                newFrozenXid = classForm->relfrozenxid;
        }
 
        if (MultiXactIdIsValid(classForm->relminmxid))
        {
            /* check for values in the future */
            if (MultiXactIdPrecedes(lastSaneMinMulti, classForm->relminmxid))
            {
                bogus = true;
                break;
            }
 
            /* determine new horizon */
            if (MultiXactIdPrecedes(classForm->relminmxid, newMinMulti))
                newMinMulti = classForm->relminmxid;
        }
    }
 
    /* we're done with pg_class */
    systable_endscan(scan);
    table_close(relation, AccessShareLock);
 
    /* chicken out if bogus data found */
    if (bogus)
        return;
 
    Assert(TransactionIdIsNormal(newFrozenXid));
    Assert(MultiXactIdIsValid(newMinMulti));
 
    /* Now fetch the pg_database tuple we need to update. */
    relation = table_open(DatabaseRelationId, RowExclusiveLock);
 
    /*
     * Get the pg_database tuple to scribble on.  Note that this does not
     * directly rely on the syscache to avoid issues with flattened toast
     * values for the in-place update.
     */
    ScanKeyInit(&key[0],
                Anum_pg_database_oid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(MyDatabaseId));
 
    scan = systable_beginscan(relation, DatabaseOidIndexId, true,
                              NULL, 1, key);
    tuple = systable_getnext(scan);
    tuple = heap_copytuple(tuple);
    systable_endscan(scan);
 
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "could not find tuple for database %u", MyDatabaseId);
 
    dbform = (Form_pg_database) GETSTRUCT(tuple);
 
    /*
     * As in vac_update_relstats(), we ordinarily don't want to let
     * datfrozenxid go backward; but if it's "in the future" then it must be
     * corrupt and it seems best to overwrite it.
     */
    if (dbform->datfrozenxid != newFrozenXid &&
        (TransactionIdPrecedes(dbform->datfrozenxid, newFrozenXid) ||
         TransactionIdPrecedes(lastSaneFrozenXid, dbform->datfrozenxid)))
    {
        dbform->datfrozenxid = newFrozenXid;
        dirty = true;
    }
    else
        newFrozenXid = dbform->datfrozenxid;
 
    /* Ditto for datminmxid */
    if (dbform->datminmxid != newMinMulti &&
        (MultiXactIdPrecedes(dbform->datminmxid, newMinMulti) ||
         MultiXactIdPrecedes(lastSaneMinMulti, dbform->datminmxid)))
    {
        dbform->datminmxid = newMinMulti;
        dirty = true;
    }
    else
        newMinMulti = dbform->datminmxid;
 
    if (dirty)
        heap_inplace_update(relation, tuple);
 
    heap_freetuple(tuple);
    table_close(relation, RowExclusiveLock);
 
    /*
     * If we were able to advance datfrozenxid or datminmxid, see if we can
     * truncate pg_xact and/or pg_multixact.  Also do it if the shared
     * XID-wrap-limit info is stale, since this action will update that too.
     */
    if (dirty || ForceTransactionIdLimitUpdate())
        vac_truncate_clog(newFrozenXid, newMinMulti,
                          lastSaneFrozenXid, lastSaneMinMulti);
}

References AccessShareLock, Assert(), BTEqualStrategyNumber, elog(), ERROR, ExclusiveLock, ForceTransactionIdLimitUpdate(), GetOldestMultiXactId(), GetOldestNonRemovableTransactionId(), GETSTRUCT, heap_copytuple(), heap_freetuple(), heap_inplace_update(), HeapTupleIsValid, InvalidOid, sort-test::key, LockDatabaseFrozenIds(), MultiXactIdIsValid, MultiXactIdPrecedes(), MyDatabaseId, ObjectIdGetDatum(), ReadNextMultiXactId(), ReadNextTransactionId(), RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), table_open(), TransactionIdIsNormal, TransactionIdIsValid, TransactionIdPrecedes(), and vac_truncate_clog().

Referenced by do_autovacuum(), and vacuum().

vac_update_relstats()

void vac_update_relstats	(	Relation	relation,
		BlockNumber	num_pages,
		double	num_tuples,
		BlockNumber	num_all_visible_pages,
		bool	hasindex,
		TransactionId	frozenxid,
		MultiXactId	minmulti,
		bool *	frozenxid_updated,
		bool *	minmulti_updated,
		bool	in_outer_xact
	)

Definition at line 1401 of file vacuum.c.

{
    Oid         relid = RelationGetRelid(relation);
    Relation    rd;
    HeapTuple   ctup;
    Form_pg_class pgcform;
    bool        dirty,
                futurexid,
                futuremxid;
    TransactionId oldfrozenxid;
    MultiXactId oldminmulti;
 
    rd = table_open(RelationRelationId, RowExclusiveLock);
 
    /* Fetch a copy of the tuple to scribble on */
    ctup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
    if (!HeapTupleIsValid(ctup))
        elog(ERROR, "pg_class entry for relid %u vanished during vacuuming",
             relid);
    pgcform = (Form_pg_class) GETSTRUCT(ctup);
 
    /* Apply statistical updates, if any, to copied tuple */
 
    dirty = false;
    if (pgcform->relpages != (int32) num_pages)
    {
        pgcform->relpages = (int32) num_pages;
        dirty = true;
    }
    if (pgcform->reltuples != (float4) num_tuples)
    {
        pgcform->reltuples = (float4) num_tuples;
        dirty = true;
    }
    if (pgcform->relallvisible != (int32) num_all_visible_pages)
    {
        pgcform->relallvisible = (int32) num_all_visible_pages;
        dirty = true;
    }
 
    /* Apply DDL updates, but not inside an outer transaction (see above) */
 
    if (!in_outer_xact)
    {
        /*
         * If we didn't find any indexes, reset relhasindex.
         */
        if (pgcform->relhasindex && !hasindex)
        {
            pgcform->relhasindex = false;
            dirty = true;
        }
 
        /* We also clear relhasrules and relhastriggers if needed */
        if (pgcform->relhasrules && relation->rd_rules == NULL)
        {
            pgcform->relhasrules = false;
            dirty = true;
        }
        if (pgcform->relhastriggers && relation->trigdesc == NULL)
        {
            pgcform->relhastriggers = false;
            dirty = true;
        }
    }
 
    /*
     * Update relfrozenxid, unless caller passed InvalidTransactionId
     * indicating it has no new data.
     *
     * Ordinarily, we don't let relfrozenxid go backwards.  However, if the
     * stored relfrozenxid is "in the future" then it seems best to assume
     * it's corrupt, and overwrite with the oldest remaining XID in the table.
     * This should match vac_update_datfrozenxid() concerning what we consider
     * to be "in the future".
     */
    oldfrozenxid = pgcform->relfrozenxid;
    futurexid = false;
    if (frozenxid_updated)
        *frozenxid_updated = false;
    if (TransactionIdIsNormal(frozenxid) && oldfrozenxid != frozenxid)
    {
        bool        update = false;
 
        if (TransactionIdPrecedes(oldfrozenxid, frozenxid))
            update = true;
        else if (TransactionIdPrecedes(ReadNextTransactionId(), oldfrozenxid))
            futurexid = update = true;
 
        if (update)
        {
            pgcform->relfrozenxid = frozenxid;
            dirty = true;
            if (frozenxid_updated)
                *frozenxid_updated = true;
        }
    }
 
    /* Similarly for relminmxid */
    oldminmulti = pgcform->relminmxid;
    futuremxid = false;
    if (minmulti_updated)
        *minmulti_updated = false;
    if (MultiXactIdIsValid(minmulti) && oldminmulti != minmulti)
    {
        bool        update = false;
 
        if (MultiXactIdPrecedes(oldminmulti, minmulti))
            update = true;
        else if (MultiXactIdPrecedes(ReadNextMultiXactId(), oldminmulti))
            futuremxid = update = true;
 
        if (update)
        {
            pgcform->relminmxid = minmulti;
            dirty = true;
            if (minmulti_updated)
                *minmulti_updated = true;
        }
    }
 
    /* If anything changed, write out the tuple. */
    if (dirty)
        heap_inplace_update(rd, ctup);
 
    table_close(rd, RowExclusiveLock);
 
    if (futurexid)
        ereport(WARNING,
                (errcode(ERRCODE_DATA_CORRUPTED),
                 errmsg_internal("overwrote invalid relfrozenxid value %u with new value %u for table \"%s\"",
                                 oldfrozenxid, frozenxid,
                                 RelationGetRelationName(relation))));
    if (futuremxid)
        ereport(WARNING,
                (errcode(ERRCODE_DATA_CORRUPTED),
                 errmsg_internal("overwrote invalid relminmxid value %u with new value %u for table \"%s\"",
                                 oldminmulti, minmulti,
                                 RelationGetRelationName(relation))));
}

References elog(), ereport, errcode(), ERRCODE_DATA_CORRUPTED, errmsg_internal(), ERROR, GETSTRUCT, heap_inplace_update(), HeapTupleIsValid, MultiXactIdIsValid, MultiXactIdPrecedes(), ObjectIdGetDatum(), RelationData::rd_rules, ReadNextMultiXactId(), ReadNextTransactionId(), RelationGetRelationName, RelationGetRelid, RELOID, RowExclusiveLock, SearchSysCacheCopy1, table_close(), table_open(), TransactionIdIsNormal, TransactionIdPrecedes(), RelationData::trigdesc, and WARNING.

Referenced by do_analyze_rel(), heap_vacuum_rel(), and update_relstats_all_indexes().

vacuum()

void vacuum	(	List *	relations,
		VacuumParams *	params,
		BufferAccessStrategy	bstrategy,
		MemoryContext	vac_context,
		bool	isTopLevel
	)

Definition at line 478 of file vacuum.c.

{
    static bool in_vacuum = false;
 
    const char *stmttype;
    volatile bool in_outer_xact,
                use_own_xacts;
 
    Assert(params != NULL);
 
    stmttype = (params->options & VACOPT_VACUUM) ? "VACUUM" : "ANALYZE";
 
    /*
     * We cannot run VACUUM inside a user transaction block; if we were inside
     * a transaction, then our commit- and start-transaction-command calls
     * would not have the intended effect!  There are numerous other subtle
     * dependencies on this, too.
     *
     * ANALYZE (without VACUUM) can run either way.
     */
    if (params->options & VACOPT_VACUUM)
    {
        PreventInTransactionBlock(isTopLevel, stmttype);
        in_outer_xact = false;
    }
    else
        in_outer_xact = IsInTransactionBlock(isTopLevel);
 
    /*
     * Check for and disallow recursive calls.  This could happen when VACUUM
     * FULL or ANALYZE calls a hostile index expression that itself calls
     * ANALYZE.
     */
    if (in_vacuum)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("%s cannot be executed from VACUUM or ANALYZE",
                        stmttype)));
 
    /*
     * Build list of relation(s) to process, putting any new data in
     * vac_context for safekeeping.
     */
    if (params->options & VACOPT_ONLY_DATABASE_STATS)
    {
        /* We don't process any tables in this case */
        Assert(relations == NIL);
    }
    else if (relations != NIL)
    {
        List       *newrels = NIL;
        ListCell   *lc;
 
        foreach(lc, relations)
        {
            VacuumRelation *vrel = lfirst_node(VacuumRelation, lc);
            List       *sublist;
            MemoryContext old_context;
 
            sublist = expand_vacuum_rel(vrel, vac_context, params->options);
            old_context = MemoryContextSwitchTo(vac_context);
            newrels = list_concat(newrels, sublist);
            MemoryContextSwitchTo(old_context);
        }
        relations = newrels;
    }
    else
        relations = get_all_vacuum_rels(vac_context, params->options);
 
    /*
     * Decide whether we need to start/commit our own transactions.
     *
     * For VACUUM (with or without ANALYZE): always do so, so that we can
     * release locks as soon as possible.  (We could possibly use the outer
     * transaction for a one-table VACUUM, but handling TOAST tables would be
     * problematic.)
     *
     * For ANALYZE (no VACUUM): if inside a transaction block, we cannot
     * start/commit our own transactions.  Also, there's no need to do so if
     * only processing one relation.  For multiple relations when not within a
     * transaction block, and also in an autovacuum worker, use own
     * transactions so we can release locks sooner.
     */
    if (params->options & VACOPT_VACUUM)
        use_own_xacts = true;
    else
    {
        Assert(params->options & VACOPT_ANALYZE);
        if (IsAutoVacuumWorkerProcess())
            use_own_xacts = true;
        else if (in_outer_xact)
            use_own_xacts = false;
        else if (list_length(relations) > 1)
            use_own_xacts = true;
        else
            use_own_xacts = false;
    }
 
    /*
     * vacuum_rel expects to be entered with no transaction active; it will
     * start and commit its own transaction.  But we are called by an SQL
     * command, and so we are executing inside a transaction already. We
     * commit the transaction started in PostgresMain() here, and start
     * another one before exiting to match the commit waiting for us back in
     * PostgresMain().
     */
    if (use_own_xacts)
    {
        Assert(!in_outer_xact);
 
        /* ActiveSnapshot is not set by autovacuum */
        if (ActiveSnapshotSet())
            PopActiveSnapshot();
 
        /* matches the StartTransaction in PostgresMain() */
        CommitTransactionCommand();
    }
 
    /* Turn vacuum cost accounting on or off, and set/clear in_vacuum */
    PG_TRY();
    {
        ListCell   *cur;
 
        in_vacuum = true;
        VacuumFailsafeActive = false;
        VacuumUpdateCosts();
        VacuumCostBalance = 0;
        VacuumPageHit = 0;
        VacuumPageMiss = 0;
        VacuumPageDirty = 0;
        VacuumCostBalanceLocal = 0;
        VacuumSharedCostBalance = NULL;
        VacuumActiveNWorkers = NULL;
 
        /*
         * Loop to process each selected relation.
         */
        foreach(cur, relations)
        {
            VacuumRelation *vrel = lfirst_node(VacuumRelation, cur);
 
            if (params->options & VACOPT_VACUUM)
            {
                if (!vacuum_rel(vrel->oid, vrel->relation, params, bstrategy))
                    continue;
            }
 
            if (params->options & VACOPT_ANALYZE)
            {
                /*
                 * If using separate xacts, start one for analyze. Otherwise,
                 * we can use the outer transaction.
                 */
                if (use_own_xacts)
                {
                    StartTransactionCommand();
                    /* functions in indexes may want a snapshot set */
                    PushActiveSnapshot(GetTransactionSnapshot());
                }
 
                analyze_rel(vrel->oid, vrel->relation, params,
                            vrel->va_cols, in_outer_xact, bstrategy);
 
                if (use_own_xacts)
                {
                    PopActiveSnapshot();
                    CommitTransactionCommand();
                }
                else
                {
                    /*
                     * If we're not using separate xacts, better separate the
                     * ANALYZE actions with CCIs.  This avoids trouble if user
                     * says "ANALYZE t, t".
                     */
                    CommandCounterIncrement();
                }
            }
 
            /*
             * Ensure VacuumFailsafeActive has been reset before vacuuming the
             * next relation.
             */
            VacuumFailsafeActive = false;
        }
    }
    PG_FINALLY();
    {
        in_vacuum = false;
        VacuumCostActive = false;
        VacuumFailsafeActive = false;
        VacuumCostBalance = 0;
    }
    PG_END_TRY();
 
    /*
     * Finish up processing.
     */
    if (use_own_xacts)
    {
        /* here, we are not in a transaction */
 
        /*
         * This matches the CommitTransaction waiting for us in
         * PostgresMain().
         */
        StartTransactionCommand();
    }
 
    if ((params->options & VACOPT_VACUUM) &&
        !(params->options & VACOPT_SKIP_DATABASE_STATS))
    {
        /*
         * Update pg_database.datfrozenxid, and truncate pg_xact if possible.
         */
        vac_update_datfrozenxid();
    }
 
}

References ActiveSnapshotSet(), analyze_rel(), Assert(), CommandCounterIncrement(), CommitTransactionCommand(), cur, ereport, errcode(), errmsg(), ERROR, expand_vacuum_rel(), get_all_vacuum_rels(), GetTransactionSnapshot(), IsAutoVacuumWorkerProcess(), IsInTransactionBlock(), lfirst_node, list_concat(), list_length(), MemoryContextSwitchTo(), NIL, VacuumRelation::oid, VacuumParams::options, PG_END_TRY, PG_FINALLY, PG_TRY, PopActiveSnapshot(), PreventInTransactionBlock(), PushActiveSnapshot(), VacuumRelation::relation, StartTransactionCommand(), VacuumRelation::va_cols, vac_update_datfrozenxid(), VACOPT_ANALYZE, VACOPT_ONLY_DATABASE_STATS, VACOPT_SKIP_DATABASE_STATS, VACOPT_VACUUM, vacuum_rel(), VacuumActiveNWorkers, VacuumCostActive, VacuumCostBalance, VacuumCostBalanceLocal, VacuumFailsafeActive, VacuumPageDirty, VacuumPageHit, VacuumPageMiss, VacuumSharedCostBalance, and VacuumUpdateCosts().

Referenced by autovacuum_do_vac_analyze(), ExecVacuum(), parallel_vacuum_index_is_parallel_safe(), and parallel_vacuum_process_all_indexes().

vacuum_delay_point()

void vacuum_delay_point

(

void

)

Definition at line 2322 of file vacuum.c.

{
    double      msec = 0;
 
    /* Always check for interrupts */
    CHECK_FOR_INTERRUPTS();
 
    if (InterruptPending ||
        (!VacuumCostActive && !ConfigReloadPending))
        return;
 
    /*
     * Autovacuum workers should reload the configuration file if requested.
     * This allows changes to [autovacuum_]vacuum_cost_limit and
     * [autovacuum_]vacuum_cost_delay to take effect while a table is being
     * vacuumed or analyzed.
     */
    if (ConfigReloadPending && IsAutoVacuumWorkerProcess())
    {
        ConfigReloadPending = false;
        ProcessConfigFile(PGC_SIGHUP);
        VacuumUpdateCosts();
    }
 
    /*
     * If we disabled cost-based delays after reloading the config file,
     * return.
     */
    if (!VacuumCostActive)
        return;
 
    /*
     * For parallel vacuum, the delay is computed based on the shared cost
     * balance.  See compute_parallel_delay.
     */
    if (VacuumSharedCostBalance != NULL)
        msec = compute_parallel_delay();
    else if (VacuumCostBalance >= vacuum_cost_limit)
        msec = vacuum_cost_delay * VacuumCostBalance / vacuum_cost_limit;
 
    /* Nap if appropriate */
    if (msec > 0)
    {
        if (msec > vacuum_cost_delay * 4)
            msec = vacuum_cost_delay * 4;
 
        pgstat_report_wait_start(WAIT_EVENT_VACUUM_DELAY);
        pg_usleep(msec * 1000);
        pgstat_report_wait_end();
 
        /*
         * We don't want to ignore postmaster death during very long vacuums
         * with vacuum_cost_delay configured.  We can't use the usual
         * WaitLatch() approach here because we want microsecond-based sleep
         * durations above.
         */
        if (IsUnderPostmaster && !PostmasterIsAlive())
            exit(1);
 
        VacuumCostBalance = 0;
 
        /*
         * Balance and update limit values for autovacuum workers. We must do
         * this periodically, as the number of workers across which we are
         * balancing the limit may have changed.
         *
         * TODO: There may be better criteria for determining when to do this
         * besides "check after napping".
         */
        AutoVacuumUpdateCostLimit();
 
        /* Might have gotten an interrupt while sleeping */
        CHECK_FOR_INTERRUPTS();
    }
}

References AutoVacuumUpdateCostLimit(), CHECK_FOR_INTERRUPTS, compute_parallel_delay(), ConfigReloadPending, exit(), InterruptPending, IsAutoVacuumWorkerProcess(), IsUnderPostmaster, pg_usleep(), PGC_SIGHUP, pgstat_report_wait_end(), pgstat_report_wait_start(), PostmasterIsAlive, ProcessConfigFile(), vacuum_cost_delay, vacuum_cost_limit, VacuumCostActive, VacuumCostBalance, VacuumSharedCostBalance, and VacuumUpdateCosts().

Referenced by acquire_sample_rows(), blbulkdelete(), blvacuumcleanup(), btvacuumpage(), compute_array_stats(), compute_distinct_stats(), compute_index_stats(), compute_range_stats(), compute_scalar_stats(), compute_trivial_stats(), compute_tsvector_stats(), file_acquire_sample_rows(), ginbulkdelete(), ginInsertCleanup(), ginvacuumcleanup(), gistvacuumpage(), hashbucketcleanup(), lazy_scan_heap(), lazy_scan_skip(), lazy_vacuum_heap_rel(), spgprocesspending(), and spgvacuumpage().

vacuum_get_cutoffs()

bool vacuum_get_cutoffs	(	Relation	rel,
		const VacuumParams *	params,
		struct VacuumCutoffs *	cutoffs
	)

Definition at line 1075 of file vacuum.c.

{
    int         freeze_min_age,
                multixact_freeze_min_age,
                freeze_table_age,
                multixact_freeze_table_age,
                effective_multixact_freeze_max_age;
    TransactionId nextXID,
                safeOldestXmin,
                aggressiveXIDCutoff;
    MultiXactId nextMXID,
                safeOldestMxact,
                aggressiveMXIDCutoff;
 
    /* Use mutable copies of freeze age parameters */
    freeze_min_age = params->freeze_min_age;
    multixact_freeze_min_age = params->multixact_freeze_min_age;
    freeze_table_age = params->freeze_table_age;
    multixact_freeze_table_age = params->multixact_freeze_table_age;
 
    /* Set pg_class fields in cutoffs */
    cutoffs->relfrozenxid = rel->rd_rel->relfrozenxid;
    cutoffs->relminmxid = rel->rd_rel->relminmxid;
 
    /*
     * Acquire OldestXmin.
     *
     * We can always ignore processes running lazy vacuum.  This is because we
     * use these values only for deciding which tuples we must keep in the
     * tables.  Since lazy vacuum doesn't write its XID anywhere (usually no
     * XID assigned), it's safe to ignore it.  In theory it could be
     * problematic to ignore lazy vacuums in a full vacuum, but keep in mind
     * that only one vacuum process can be working on a particular table at
     * any time, and that each vacuum is always an independent transaction.
     */
    cutoffs->OldestXmin = GetOldestNonRemovableTransactionId(rel);
 
    Assert(TransactionIdIsNormal(cutoffs->OldestXmin));
 
    /* Acquire OldestMxact */
    cutoffs->OldestMxact = GetOldestMultiXactId();
    Assert(MultiXactIdIsValid(cutoffs->OldestMxact));
 
    /* Acquire next XID/next MXID values used to apply age-based settings */
    nextXID = ReadNextTransactionId();
    nextMXID = ReadNextMultiXactId();
 
    /*
     * Also compute the multixact age for which freezing is urgent.  This is
     * normally autovacuum_multixact_freeze_max_age, but may be less if we are
     * short of multixact member space.
     */
    effective_multixact_freeze_max_age = MultiXactMemberFreezeThreshold();
 
    /*
     * Almost ready to set freeze output parameters; check if OldestXmin or
     * OldestMxact are held back to an unsafe degree before we start on that
     */
    safeOldestXmin = nextXID - autovacuum_freeze_max_age;
    if (!TransactionIdIsNormal(safeOldestXmin))
        safeOldestXmin = FirstNormalTransactionId;
    safeOldestMxact = nextMXID - effective_multixact_freeze_max_age;
    if (safeOldestMxact < FirstMultiXactId)
        safeOldestMxact = FirstMultiXactId;
    if (TransactionIdPrecedes(cutoffs->OldestXmin, safeOldestXmin))
        ereport(WARNING,
                (errmsg("cutoff for removing and freezing tuples is far in the past"),
                 errhint("Close open transactions soon to avoid wraparound problems.\n"
                         "You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
    if (MultiXactIdPrecedes(cutoffs->OldestMxact, safeOldestMxact))
        ereport(WARNING,
                (errmsg("cutoff for freezing multixacts is far in the past"),
                 errhint("Close open transactions soon to avoid wraparound problems.\n"
                         "You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
 
    /*
     * Determine the minimum freeze age to use: as specified by the caller, or
     * vacuum_freeze_min_age, but in any case not more than half
     * autovacuum_freeze_max_age, so that autovacuums to prevent XID
     * wraparound won't occur too frequently.
     */
    if (freeze_min_age < 0)
        freeze_min_age = vacuum_freeze_min_age;
    freeze_min_age = Min(freeze_min_age, autovacuum_freeze_max_age / 2);
    Assert(freeze_min_age >= 0);
 
    /* Compute FreezeLimit, being careful to generate a normal XID */
    cutoffs->FreezeLimit = nextXID - freeze_min_age;
    if (!TransactionIdIsNormal(cutoffs->FreezeLimit))
        cutoffs->FreezeLimit = FirstNormalTransactionId;
    /* FreezeLimit must always be <= OldestXmin */
    if (TransactionIdPrecedes(cutoffs->OldestXmin, cutoffs->FreezeLimit))
        cutoffs->FreezeLimit = cutoffs->OldestXmin;
 
    /*
     * Determine the minimum multixact freeze age to use: as specified by
     * caller, or vacuum_multixact_freeze_min_age, but in any case not more
     * than half effective_multixact_freeze_max_age, so that autovacuums to
     * prevent MultiXact wraparound won't occur too frequently.
     */
    if (multixact_freeze_min_age < 0)
        multixact_freeze_min_age = vacuum_multixact_freeze_min_age;
    multixact_freeze_min_age = Min(multixact_freeze_min_age,
                                   effective_multixact_freeze_max_age / 2);
    Assert(multixact_freeze_min_age >= 0);
 
    /* Compute MultiXactCutoff, being careful to generate a valid value */
    cutoffs->MultiXactCutoff = nextMXID - multixact_freeze_min_age;
    if (cutoffs->MultiXactCutoff < FirstMultiXactId)
        cutoffs->MultiXactCutoff = FirstMultiXactId;
    /* MultiXactCutoff must always be <= OldestMxact */
    if (MultiXactIdPrecedes(cutoffs->OldestMxact, cutoffs->MultiXactCutoff))
        cutoffs->MultiXactCutoff = cutoffs->OldestMxact;
 
    /*
     * Finally, figure out if caller needs to do an aggressive VACUUM or not.
     *
     * Determine the table freeze age to use: as specified by the caller, or
     * the value of the vacuum_freeze_table_age GUC, but in any case not more
     * than autovacuum_freeze_max_age * 0.95, so that if you have e.g nightly
     * VACUUM schedule, the nightly VACUUM gets a chance to freeze XIDs before
     * anti-wraparound autovacuum is launched.
     */
    if (freeze_table_age < 0)
        freeze_table_age = vacuum_freeze_table_age;
    freeze_table_age = Min(freeze_table_age, autovacuum_freeze_max_age * 0.95);
    Assert(freeze_table_age >= 0);
    aggressiveXIDCutoff = nextXID - freeze_table_age;
    if (!TransactionIdIsNormal(aggressiveXIDCutoff))
        aggressiveXIDCutoff = FirstNormalTransactionId;
    if (TransactionIdPrecedesOrEquals(rel->rd_rel->relfrozenxid,
                                      aggressiveXIDCutoff))
        return true;
 
    /*
     * Similar to the above, determine the table freeze age to use for
     * multixacts: as specified by the caller, or the value of the
     * vacuum_multixact_freeze_table_age GUC, but in any case not more than
     * effective_multixact_freeze_max_age * 0.95, so that if you have e.g.
     * nightly VACUUM schedule, the nightly VACUUM gets a chance to freeze
     * multixacts before anti-wraparound autovacuum is launched.
     */
    if (multixact_freeze_table_age < 0)
        multixact_freeze_table_age = vacuum_multixact_freeze_table_age;
    multixact_freeze_table_age =
        Min(multixact_freeze_table_age,
            effective_multixact_freeze_max_age * 0.95);
    Assert(multixact_freeze_table_age >= 0);
    aggressiveMXIDCutoff = nextMXID - multixact_freeze_table_age;
    if (aggressiveMXIDCutoff < FirstMultiXactId)
        aggressiveMXIDCutoff = FirstMultiXactId;
    if (MultiXactIdPrecedesOrEquals(rel->rd_rel->relminmxid,
                                    aggressiveMXIDCutoff))
        return true;
 
    /* Non-aggressive VACUUM */
    return false;
}

References Assert(), autovacuum_freeze_max_age, ereport, errhint(), errmsg(), FirstMultiXactId, FirstNormalTransactionId, VacuumParams::freeze_min_age, VacuumParams::freeze_table_age, VacuumCutoffs::FreezeLimit, GetOldestMultiXactId(), GetOldestNonRemovableTransactionId(), Min, VacuumParams::multixact_freeze_min_age, VacuumParams::multixact_freeze_table_age, VacuumCutoffs::MultiXactCutoff, MultiXactIdIsValid, MultiXactIdPrecedes(), MultiXactIdPrecedesOrEquals(), MultiXactMemberFreezeThreshold(), VacuumCutoffs::OldestMxact, VacuumCutoffs::OldestXmin, RelationData::rd_rel, ReadNextMultiXactId(), ReadNextTransactionId(), VacuumCutoffs::relfrozenxid, VacuumCutoffs::relminmxid, TransactionIdIsNormal, TransactionIdPrecedes(), TransactionIdPrecedesOrEquals(), vacuum_freeze_min_age, vacuum_freeze_table_age, vacuum_multixact_freeze_min_age, vacuum_multixact_freeze_table_age, and WARNING.

Referenced by copy_table_data(), and heap_vacuum_rel().

vacuum_is_relation_owner()

bool vacuum_is_relation_owner	(	Oid	relid,
		Form_pg_class	reltuple,
		bits32	options
	)

Definition at line 707 of file vacuum.c.

{
    char       *relname;
 
    Assert((options & (VACOPT_VACUUM | VACOPT_ANALYZE)) != 0);
 
    /*
     * Check permissions.
     *
     * We allow the user to vacuum or analyze a table if he is superuser, the
     * table owner, or the database owner (but in the latter case, only if
     * it's not a shared relation).  object_ownercheck includes the superuser
     * case.
     *
     * Note we choose to treat permissions failure as a WARNING and keep
     * trying to vacuum or analyze the rest of the DB --- is this appropriate?
     */
    if (object_ownercheck(RelationRelationId, relid, GetUserId()) ||
        (object_ownercheck(DatabaseRelationId, MyDatabaseId, GetUserId()) && !reltuple->relisshared))
        return true;
 
    relname = NameStr(reltuple->relname);
 
    if ((options & VACOPT_VACUUM) != 0)
    {
        ereport(WARNING,
                (errmsg("permission denied to vacuum \"%s\", skipping it",
                        relname)));
 
        /*
         * For VACUUM ANALYZE, both logs could show up, but just generate
         * information for VACUUM as that would be the first one to be
         * processed.
         */
        return false;
    }
 
    if ((options & VACOPT_ANALYZE) != 0)
        ereport(WARNING,
                (errmsg("permission denied to analyze \"%s\", skipping it",
                        relname)));
 
    return false;
}

References Assert(), ereport, errmsg(), GetUserId(), MyDatabaseId, NameStr, object_ownercheck(), relname, VACOPT_ANALYZE, VACOPT_VACUUM, and WARNING.

Referenced by analyze_rel(), expand_vacuum_rel(), get_all_vacuum_rels(), and vacuum_rel().

vacuum_open_relation()

Relation vacuum_open_relation	(	Oid	relid,
		RangeVar *	relation,
		bits32	options,
		bool	verbose,
		LOCKMODE	lmode
	)

Definition at line 761 of file vacuum.c.

{
    Relation    rel;
    bool        rel_lock = true;
    int         elevel;
 
    Assert((options & (VACOPT_VACUUM | VACOPT_ANALYZE)) != 0);
 
    /*
     * Open the relation and get the appropriate lock on it.
     *
     * There's a race condition here: the relation may have gone away since
     * the last time we saw it.  If so, we don't need to vacuum or analyze it.
     *
     * If we've been asked not to wait for the relation lock, acquire it first
     * in non-blocking mode, before calling try_relation_open().
     */
    if (!(options & VACOPT_SKIP_LOCKED))
        rel = try_relation_open(relid, lmode);
    else if (ConditionalLockRelationOid(relid, lmode))
        rel = try_relation_open(relid, NoLock);
    else
    {
        rel = NULL;
        rel_lock = false;
    }
 
    /* if relation is opened, leave */
    if (rel)
        return rel;
 
    /*
     * Relation could not be opened, hence generate if possible a log
     * informing on the situation.
     *
     * If the RangeVar is not defined, we do not have enough information to
     * provide a meaningful log statement.  Chances are that the caller has
     * intentionally not provided this information so that this logging is
     * skipped, anyway.
     */
    if (relation == NULL)
        return NULL;
 
    /*
     * Determine the log level.
     *
     * For manual VACUUM or ANALYZE, we emit a WARNING to match the log
     * statements in the permission checks; otherwise, only log if the caller
     * so requested.
     */
    if (!IsAutoVacuumWorkerProcess())
        elevel = WARNING;
    else if (verbose)
        elevel = LOG;
    else
        return NULL;
 
    if ((options & VACOPT_VACUUM) != 0)
    {
        if (!rel_lock)
            ereport(elevel,
                    (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
                     errmsg("skipping vacuum of \"%s\" --- lock not available",
                            relation->relname)));
        else
            ereport(elevel,
                    (errcode(ERRCODE_UNDEFINED_TABLE),
                     errmsg("skipping vacuum of \"%s\" --- relation no longer exists",
                            relation->relname)));
 
        /*
         * For VACUUM ANALYZE, both logs could show up, but just generate
         * information for VACUUM as that would be the first one to be
         * processed.
         */
        return NULL;
    }
 
    if ((options & VACOPT_ANALYZE) != 0)
    {
        if (!rel_lock)
            ereport(elevel,
                    (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
                     errmsg("skipping analyze of \"%s\" --- lock not available",
                            relation->relname)));
        else
            ereport(elevel,
                    (errcode(ERRCODE_UNDEFINED_TABLE),
                     errmsg("skipping analyze of \"%s\" --- relation no longer exists",
                            relation->relname)));
    }
 
    return NULL;
}

References Assert(), ConditionalLockRelationOid(), ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errmsg(), IsAutoVacuumWorkerProcess(), LOG, NoLock, RangeVar::relname, try_relation_open(), VACOPT_ANALYZE, VACOPT_SKIP_LOCKED, VACOPT_VACUUM, verbose, and WARNING.

Referenced by analyze_rel(), and vacuum_rel().

vacuum_xid_failsafe_check()

bool vacuum_xid_failsafe_check

(

const struct VacuumCutoffs *

cutoffs

)

Definition at line 1243 of file vacuum.c.

{
    TransactionId relfrozenxid = cutoffs->relfrozenxid;
    MultiXactId relminmxid = cutoffs->relminmxid;
    TransactionId xid_skip_limit;
    MultiXactId multi_skip_limit;
    int         skip_index_vacuum;
 
    Assert(TransactionIdIsNormal(relfrozenxid));
    Assert(MultiXactIdIsValid(relminmxid));
 
    /*
     * Determine the index skipping age to use. In any case no less than
     * autovacuum_freeze_max_age * 1.05.
     */
    skip_index_vacuum = Max(vacuum_failsafe_age, autovacuum_freeze_max_age * 1.05);
 
    xid_skip_limit = ReadNextTransactionId() - skip_index_vacuum;
    if (!TransactionIdIsNormal(xid_skip_limit))
        xid_skip_limit = FirstNormalTransactionId;
 
    if (TransactionIdPrecedes(relfrozenxid, xid_skip_limit))
    {
        /* The table's relfrozenxid is too old */
        return true;
    }
 
    /*
     * Similar to above, determine the index skipping age to use for
     * multixact. In any case no less than autovacuum_multixact_freeze_max_age *
     * 1.05.
     */
    skip_index_vacuum = Max(vacuum_multixact_failsafe_age,
                            autovacuum_multixact_freeze_max_age * 1.05);
 
    multi_skip_limit = ReadNextMultiXactId() - skip_index_vacuum;
    if (multi_skip_limit < FirstMultiXactId)
        multi_skip_limit = FirstMultiXactId;
 
    if (MultiXactIdPrecedes(relminmxid, multi_skip_limit))
    {
        /* The table's relminmxid is too old */
        return true;
    }
 
    return false;
}

References Assert(), autovacuum_freeze_max_age, autovacuum_multixact_freeze_max_age, FirstMultiXactId, FirstNormalTransactionId, Max, MultiXactIdIsValid, MultiXactIdPrecedes(), ReadNextMultiXactId(), ReadNextTransactionId(), VacuumCutoffs::relfrozenxid, VacuumCutoffs::relminmxid, TransactionIdIsNormal, TransactionIdPrecedes(), vacuum_failsafe_age, and vacuum_multixact_failsafe_age.

Referenced by lazy_check_wraparound_failsafe().

VacuumUpdateCosts()

void VacuumUpdateCosts

(

void

)

Definition at line 1786 of file autovacuum.c.

{
    if (MyWorkerInfo)
    {
        if (av_storage_param_cost_delay >= 0)
            vacuum_cost_delay = av_storage_param_cost_delay;
        else if (autovacuum_vac_cost_delay >= 0)
            vacuum_cost_delay = autovacuum_vac_cost_delay;
        else
            /* fall back to VacuumCostDelay */
            vacuum_cost_delay = VacuumCostDelay;
 
        AutoVacuumUpdateCostLimit();
    }
    else
    {
        /* Must be explicit VACUUM or ANALYZE */
        vacuum_cost_delay = VacuumCostDelay;
        vacuum_cost_limit = VacuumCostLimit;
    }
 
    /*
     * If configuration changes are allowed to impact VacuumCostActive, make
     * sure it is updated.
     */
    if (VacuumFailsafeActive)
        Assert(!VacuumCostActive);
    else if (vacuum_cost_delay > 0)
        VacuumCostActive = true;
    else
    {
        VacuumCostActive = false;
        VacuumCostBalance = 0;
    }
 
    /*
     * Since the cost logging requires a lock, avoid rendering the log message
     * in case we are using a message level where the log wouldn't be emitted.
     */
    if (MyWorkerInfo && message_level_is_interesting(DEBUG2))
    {
        Oid         dboid,
                    tableoid;
 
        Assert(!LWLockHeldByMe(AutovacuumLock));
 
        LWLockAcquire(AutovacuumLock, LW_SHARED);
        dboid = MyWorkerInfo->wi_dboid;
        tableoid = MyWorkerInfo->wi_tableoid;
        LWLockRelease(AutovacuumLock);
 
        elog(DEBUG2,
             "Autovacuum VacuumUpdateCosts(db=%u, rel=%u, dobalance=%s, cost_limit=%d, cost_delay=%g active=%s failsafe=%s)",
             dboid, tableoid, pg_atomic_unlocked_test_flag(&MyWorkerInfo->wi_dobalance) ? "no" : "yes",
             vacuum_cost_limit, vacuum_cost_delay,
             vacuum_cost_delay > 0 ? "yes" : "no",
             VacuumFailsafeActive ? "yes" : "no");
    }
}

References Assert(), autovacuum_vac_cost_delay, AutoVacuumUpdateCostLimit(), av_storage_param_cost_delay, DEBUG2, elog(), LW_SHARED, LWLockAcquire(), LWLockHeldByMe(), LWLockRelease(), message_level_is_interesting(), MyWorkerInfo, pg_atomic_unlocked_test_flag(), vacuum_cost_delay, vacuum_cost_limit, VacuumCostActive, VacuumCostBalance, VacuumCostDelay, VacuumCostLimit, VacuumFailsafeActive, WorkerInfoData::wi_dboid, WorkerInfoData::wi_dobalance, and WorkerInfoData::wi_tableoid.

Referenced by do_autovacuum(), parallel_vacuum_main(), vacuum(), and vacuum_delay_point().

Variable Documentation

default_statistics_target

PGDLLIMPORT int default_statistics_target

extern

Definition at line 83 of file analyze.c.

Referenced by multirange_typanalyze(), range_typanalyze(), statext_compute_stattarget(), std_typanalyze(), and ts_typanalyze().

vacuum_cost_delay

PGDLLIMPORT double vacuum_cost_delay

extern

Definition at line 82 of file vacuum.c.

Referenced by compute_parallel_delay(), default_reloptions(), vacuum_delay_point(), and VacuumUpdateCosts().

vacuum_cost_limit

PGDLLIMPORT int vacuum_cost_limit

extern

Definition at line 83 of file vacuum.c.

Referenced by AutoVacuumUpdateCostLimit(), compute_parallel_delay(), default_reloptions(), vacuum_delay_point(), and VacuumUpdateCosts().

vacuum_failsafe_age

PGDLLIMPORT int vacuum_failsafe_age

extern

Definition at line 73 of file vacuum.c.

Referenced by vacuum_xid_failsafe_check().

vacuum_freeze_min_age

PGDLLIMPORT int vacuum_freeze_min_age

extern

Definition at line 69 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_freeze_table_age

PGDLLIMPORT int vacuum_freeze_table_age

extern

Definition at line 70 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_multixact_failsafe_age

PGDLLIMPORT int vacuum_multixact_failsafe_age

extern

Definition at line 74 of file vacuum.c.

Referenced by vacuum_xid_failsafe_check().

vacuum_multixact_freeze_min_age

PGDLLIMPORT int vacuum_multixact_freeze_min_age

extern

Definition at line 71 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_multixact_freeze_table_age

PGDLLIMPORT int vacuum_multixact_freeze_table_age

extern

Definition at line 72 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

VacuumActiveNWorkers

PGDLLIMPORT pg_atomic_uint32* VacuumActiveNWorkers

extern

Definition at line 105 of file vacuum.c.

Referenced by compute_parallel_delay(), parallel_vacuum_main(), parallel_vacuum_process_all_indexes(), parallel_vacuum_process_safe_indexes(), parallel_vacuum_process_unsafe_indexes(), and vacuum().

VacuumCostBalanceLocal

PGDLLIMPORT int VacuumCostBalanceLocal

extern

Definition at line 106 of file vacuum.c.

Referenced by compute_parallel_delay(), parallel_vacuum_main(), parallel_vacuum_process_all_indexes(), and vacuum().

VacuumFailsafeActive

PGDLLIMPORT bool VacuumFailsafeActive

extern

Definition at line 98 of file vacuum.c.

Referenced by heap_vacuum_rel(), lazy_check_wraparound_failsafe(), lazy_vacuum(), lazy_vacuum_all_indexes(), should_attempt_truncation(), vacuum(), and VacuumUpdateCosts().

VacuumSharedCostBalance

PGDLLIMPORT pg_atomic_uint32* VacuumSharedCostBalance

extern

Definition at line 104 of file vacuum.c.

Referenced by compute_parallel_delay(), parallel_vacuum_main(), parallel_vacuum_process_all_indexes(), vacuum(), and vacuum_delay_point().