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	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_TOAST   0x40 /* process the TOAST table, if any */
#define	VACOPT_DISABLE_PAGE_SKIPPING   0x80 /* don't skip any pages */
#define	MAXDEADITEMS(avail_mem)    (((avail_mem) - offsetof(VacDeadItems, items)) / sizeof(ItemPointerData))

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, 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_set_xid_limits (Relation rel, int freeze_min_age, int freeze_table_age, int multixact_freeze_min_age, int multixact_freeze_table_age, TransactionId *oldestXmin, MultiXactId *oldestMxact, TransactionId *freezeLimit, MultiXactId *multiXactCutoff)
bool	vacuum_xid_failsafe_check (TransactionId relfrozenxid, MultiXactId relminmxid)
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)
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

Macro Definition Documentation

MAXDEADITEMS

#define MAXDEADITEMS

(

avail_mem

)

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

Definition at line 250 of file vacuum.h.

VACOPT_ANALYZE

#define VACOPT_ANALYZE   0x02 /* do ANALYZE */

Definition at line 184 of file vacuum.h.

VACOPT_DISABLE_PAGE_SKIPPING

#define VACOPT_DISABLE_PAGE_SKIPPING   0x80 /* don't skip any pages */

Definition at line 190 of file vacuum.h.

VACOPT_FREEZE

#define VACOPT_FREEZE   0x08 /* FREEZE option */

Definition at line 186 of file vacuum.h.

VACOPT_FULL

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

Definition at line 187 of file vacuum.h.

VACOPT_PROCESS_TOAST

#define VACOPT_PROCESS_TOAST   0x40 /* process the TOAST table, if any */

Definition at line 189 of file vacuum.h.

VACOPT_SKIP_LOCKED

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

Definition at line 188 of file vacuum.h.

VACOPT_VACUUM

#define VACOPT_VACUUM   0x01 /* do VACUUM */

Definition at line 183 of file vacuum.h.

VACOPT_VERBOSE

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

Definition at line 185 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 200 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);
}

ExecVacuum()

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

Definition at line 107 of file vacuum.c.

{
    VacuumParams params;
    bool        verbose = false;
    bool        skip_locked = false;
    bool        analyze = false;
    bool        freeze = false;
    bool        full = false;
    bool        disable_page_skipping = false;
    bool        process_toast = true;
    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;
 
    /* 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 (!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_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
            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_toast ? VACOPT_PROCESS_TOAST : 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")));
 
    /*
     * Make sure VACOPT_ANALYZE is specified if any column lists are present.
     */
    if (!(params.options & VACOPT_ANALYZE))
    {
        ListCell   *lc;
 
        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")));
        }
    }
 
    /*
     * 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;
 
    /* Now go through the common routine */
    vacuum(vacstmt->rels, &params, NULL, isTopLevel);
}

References analyze(), DefElem::arg, Assert(), defGetBoolean(), defGetInt32(), defGetString(), DefElem::defname, ereport, errcode(), errmsg(), ERROR, VacuumParams::freeze_min_age, VacuumParams::freeze_table_age, get_vacoptval_from_boolean(), VacuumParams::index_cleanup, VacuumStmt::is_vacuumcmd, VacuumParams::is_wraparound, lfirst, lfirst_node, DefElem::location, VacuumParams::log_min_duration, MAX_PARALLEL_WORKER_LIMIT, VacuumParams::multixact_freeze_min_age, VacuumParams::multixact_freeze_table_age, NIL, VacuumParams::nworkers, VacuumParams::options, VacuumStmt::options, parser_errposition(), pg_strcasecmp(), VacuumStmt::rels, VacuumParams::truncate, VacuumRelation::va_cols, VACOPT_ANALYZE, VACOPT_DISABLE_PAGE_SKIPPING, VACOPT_FREEZE, VACOPT_FULL, VACOPT_PROCESS_TOAST, VACOPT_SKIP_LOCKED, VACOPT_VACUUM, VACOPT_VERBOSE, VACOPTVALUE_AUTO, VACOPTVALUE_UNSPECIFIED, vacuum(), 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 454 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 473 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 418 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 445 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 224 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;
 
    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);
    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;
 
    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, 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, 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 935 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 */
    VacuumCostActive = (VacuumCostDelay > 0);
    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));
 
    /* 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 = GetAccessStrategy(BAS_VACUUM);
 
    /* 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(), GetAccessStrategy(), 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, RowExclusiveLock, ParallelVacuumState::shared, ShareUpdateExclusiveLock, shm_toc_lookup(), STATE_RUNNING, ParallelVacuumState::status, PGPROC::statusFlags, table_close(), table_open(), vac_close_indexes(), vac_open_indexes(), VacuumActiveNWorkers, VacuumCostActive, VacuumCostBalance, VacuumCostBalanceLocal, VacuumCostDelay, VacuumPageDirty, VacuumPageHit, VacuumPageMiss, and VacuumSharedCostBalance.

std_typanalyze()

bool std_typanalyze

(

VacAttrStats *

stats

)

Definition at line 1855 of file analyze.c.

{
    Form_pg_attribute attr = stats->attr;
    Oid         ltopr;
    Oid         eqopr;
    StdAnalyzeData *mystats;
 
    /* If the attstattarget column is negative, use the default value */
    /* NB: it is okay to scribble on stats->attr since it's a copy */
    if (attr->attstattarget < 0)
        attr->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 * attr->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 * attr->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 * attr->attstattarget;
    }
 
    return true;
}

References VacAttrStats::attr, VacAttrStats::attrtypid, 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 2326 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 2347 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 2186 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 1222 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;
 
    /*
     * If scanned_pages is zero but total_pages isn't, keep the existing value
     * of reltuples.  (Note: we might be returning -1 in this case.)
     */
    if (scanned_pages == 0)
        return old_rel_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.
     * It's particularly important to avoid becoming confused in this way due
     * to vacuumlazy.c implementation details.  For example, the tendency for
     * our caller to always scan the last heap page should not ever cause us
     * to believe that every page in the table must be just like the last
     * page.
     *
     * We apply a heuristic to avoid these problems: if the relation is
     * exactly the same size as it was at the end of the last VACUUM, and only
     * a few of its pages (less than a quasi-arbitrary threshold of 2%) were
     * scanned by this VACUUM, assume that reltuples has not changed at all.
     */
    if (old_rel_pages == total_pages &&
        scanned_pages < (double) total_pages * 0.02)
        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 2372 of file vacuum.c.

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

References Assert(), MaxAllocSize, MAXDEADITEMS, and offsetof.

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 2143 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 1491 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 1324 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,
		bool	isTopLevel
	)

Definition at line 298 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);
 
    /*
     * Due to static variables vac_context, anl_context and vac_strategy,
     * vacuum() is not reentrant.  This matters 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)));
 
    /*
     * 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")));
 
    /*
     * 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);
 
    /*
     * If caller didn't give us a buffer strategy object, make one in the
     * cross-transaction memory context.
     */
    if (bstrategy == NULL)
    {
        MemoryContext old_context = MemoryContextSwitchTo(vac_context);
 
        bstrategy = GetAccessStrategy(BAS_VACUUM);
        MemoryContextSwitchTo(old_context);
    }
    vac_strategy = bstrategy;
 
    /*
     * Build list of relation(s) to process, putting any new data in
     * vac_context for safekeeping.
     */
    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, params->options);
            old_context = MemoryContextSwitchTo(vac_context);
            newrels = list_concat(newrels, sublist);
            MemoryContextSwitchTo(old_context);
        }
        relations = newrels;
    }
    else
        relations = get_all_vacuum_rels(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;
        VacuumCostActive = (VacuumCostDelay > 0);
        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))
                    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, vac_strategy);
 
                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();
                }
            }
        }
    }
    PG_FINALLY();
    {
        in_vacuum = false;
        VacuumCostActive = false;
    }
    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) && !IsAutoVacuumWorkerProcess())
    {
        /*
         * Update pg_database.datfrozenxid, and truncate pg_xact if possible.
         * (autovacuum.c does this for itself.)
         */
        vac_update_datfrozenxid();
    }
 
    /*
     * Clean up working storage --- note we must do this after
     * StartTransactionCommand, else we might be trying to delete the active
     * context!
     */
    MemoryContextDelete(vac_context);
    vac_context = NULL;
}

References ActiveSnapshotSet(), ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, analyze_rel(), Assert(), BAS_VACUUM, CommandCounterIncrement(), CommitTransactionCommand(), cur, ereport, errcode(), errmsg(), ERROR, expand_vacuum_rel(), get_all_vacuum_rels(), GetAccessStrategy(), GetTransactionSnapshot(), IsAutoVacuumWorkerProcess(), IsInTransactionBlock(), lfirst_node, list_concat(), list_length(), MemoryContextDelete(), MemoryContextSwitchTo(), NIL, VacuumRelation::oid, VacuumParams::options, PG_END_TRY, PG_FINALLY, PG_TRY, PopActiveSnapshot(), PortalContext, PreventInTransactionBlock(), PushActiveSnapshot(), VacuumRelation::relation, StartTransactionCommand(), VacuumRelation::va_cols, vac_context, vac_strategy, vac_update_datfrozenxid(), VACOPT_ANALYZE, VACOPT_DISABLE_PAGE_SKIPPING, VACOPT_FULL, VACOPT_PROCESS_TOAST, VACOPT_VACUUM, vacuum_rel(), VacuumActiveNWorkers, VacuumCostActive, VacuumCostBalance, VacuumCostBalanceLocal, VacuumCostDelay, VacuumPageDirty, VacuumPageHit, VacuumPageMiss, and VacuumSharedCostBalance.

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 2207 of file vacuum.c.

{
    double      msec = 0;
 
    /* Always check for interrupts */
    CHECK_FOR_INTERRUPTS();
 
    if (!VacuumCostActive || InterruptPending)
        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 >= VacuumCostLimit)
        msec = VacuumCostDelay * VacuumCostBalance / VacuumCostLimit;
 
    /* Nap if appropriate */
    if (msec > 0)
    {
        if (msec > VacuumCostDelay * 4)
            msec = VacuumCostDelay * 4;
 
        (void) WaitLatch(MyLatch,
                         WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
                         msec,
                         WAIT_EVENT_VACUUM_DELAY);
        ResetLatch(MyLatch);
 
        VacuumCostBalance = 0;
 
        /* update balance values for workers */
        AutoVacuumUpdateDelay();
 
        /* Might have gotten an interrupt while sleeping */
        CHECK_FOR_INTERRUPTS();
    }
}

References AutoVacuumUpdateDelay(), CHECK_FOR_INTERRUPTS, compute_parallel_delay(), InterruptPending, MyLatch, ResetLatch(), VacuumCostActive, VacuumCostBalance, VacuumCostDelay, VacuumCostLimit, VacuumSharedCostBalance, WAIT_EVENT_VACUUM_DELAY, WaitLatch(), WL_EXIT_ON_PM_DEATH, WL_LATCH_SET, and WL_TIMEOUT.

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_is_relation_owner()

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

Definition at line 559 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).  pg_class_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 (pg_class_ownercheck(relid, GetUserId()) ||
        (pg_database_ownercheck(MyDatabaseId, GetUserId()) && !reltuple->relisshared))
        return true;
 
    relname = NameStr(reltuple->relname);
 
    if ((options & VACOPT_VACUUM) != 0)
    {
        if (reltuple->relisshared)
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only superuser can vacuum it",
                            relname)));
        else if (reltuple->relnamespace == PG_CATALOG_NAMESPACE)
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only superuser or database owner can vacuum it",
                            relname)));
        else
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only table or database owner can vacuum 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)
    {
        if (reltuple->relisshared)
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only superuser can analyze it",
                            relname)));
        else if (reltuple->relnamespace == PG_CATALOG_NAMESPACE)
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only superuser or database owner can analyze it",
                            relname)));
        else
            ereport(WARNING,
                    (errmsg("skipping \"%s\" --- only table or database owner can analyze it",
                            relname)));
    }
 
    return false;
}

References Assert(), ereport, errmsg(), GetUserId(), MyDatabaseId, NameStr, pg_class_ownercheck(), pg_database_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 633 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_set_xid_limits()

bool vacuum_set_xid_limits	(	Relation	rel,
		int	freeze_min_age,
		int	freeze_table_age,
		int	multixact_freeze_min_age,
		int	multixact_freeze_table_age,
		TransactionId *	oldestXmin,
		MultiXactId *	oldestMxact,
		TransactionId *	freezeLimit,
		MultiXactId *	multiXactCutoff
	)

Definition at line 959 of file vacuum.c.

{
    int         freezemin;
    int         mxid_freezemin;
    int         effective_multixact_freeze_max_age;
    TransactionId limit;
    TransactionId safeLimit;
    MultiXactId mxactLimit;
    MultiXactId safeMxactLimit;
    int         freezetable;
 
    /*
     * 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.
     */
    *oldestXmin = GetOldestNonRemovableTransactionId(rel);
 
    if (OldSnapshotThresholdActive())
    {
        TransactionId limit_xmin;
        TimestampTz limit_ts;
 
        if (TransactionIdLimitedForOldSnapshots(*oldestXmin, rel,
                                                &limit_xmin, &limit_ts))
        {
            /*
             * TODO: We should only set the threshold if we are pruning on the
             * basis of the increased limits.  Not as crucial here as it is
             * for opportunistic pruning (which often happens at a much higher
             * frequency), but would still be a significant improvement.
             */
            SetOldSnapshotThresholdTimestamp(limit_ts, limit_xmin);
            *oldestXmin = limit_xmin;
        }
    }
 
    Assert(TransactionIdIsNormal(*oldestXmin));
 
    /*
     * 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.
     */
    freezemin = freeze_min_age;
    if (freezemin < 0)
        freezemin = vacuum_freeze_min_age;
    freezemin = Min(freezemin, autovacuum_freeze_max_age / 2);
    Assert(freezemin >= 0);
 
    /*
     * Compute the cutoff XID, being careful not to generate a "permanent" XID
     */
    limit = *oldestXmin - freezemin;
    if (!TransactionIdIsNormal(limit))
        limit = FirstNormalTransactionId;
 
    /*
     * If oldestXmin is very far back (in practice, more than
     * autovacuum_freeze_max_age / 2 XIDs old), complain and force a minimum
     * freeze age of zero.
     */
    safeLimit = ReadNextTransactionId() - autovacuum_freeze_max_age;
    if (!TransactionIdIsNormal(safeLimit))
        safeLimit = FirstNormalTransactionId;
 
    if (TransactionIdPrecedes(limit, safeLimit))
    {
        ereport(WARNING,
                (errmsg("oldest xmin 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.")));
        limit = *oldestXmin;
    }
 
    *freezeLimit = limit;
 
    /*
     * 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();
 
    /*
     * 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.
     */
    mxid_freezemin = multixact_freeze_min_age;
    if (mxid_freezemin < 0)
        mxid_freezemin = vacuum_multixact_freeze_min_age;
    mxid_freezemin = Min(mxid_freezemin,
                         effective_multixact_freeze_max_age / 2);
    Assert(mxid_freezemin >= 0);
 
    /* Remember for caller */
    *oldestMxact = GetOldestMultiXactId();
 
    /* compute the cutoff multi, being careful to generate a valid value */
    mxactLimit = *oldestMxact - mxid_freezemin;
    if (mxactLimit < FirstMultiXactId)
        mxactLimit = FirstMultiXactId;
 
    safeMxactLimit =
        ReadNextMultiXactId() - effective_multixact_freeze_max_age;
    if (safeMxactLimit < FirstMultiXactId)
        safeMxactLimit = FirstMultiXactId;
 
    if (MultiXactIdPrecedes(mxactLimit, safeMxactLimit))
    {
        ereport(WARNING,
                (errmsg("oldest multixact is far in the past"),
                 errhint("Close open transactions with multixacts soon to avoid wraparound problems.")));
        /* Use the safe limit, unless an older mxact is still running */
        if (MultiXactIdPrecedes(*oldestMxact, safeMxactLimit))
            mxactLimit = *oldestMxact;
        else
            mxactLimit = safeMxactLimit;
    }
 
    *multiXactCutoff = mxactLimit;
 
    /*
     * Done setting output parameters; just need to 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
     * vacuum_freeze_table_age, 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 tuples
     * before anti-wraparound autovacuum is launched.
     */
    freezetable = freeze_table_age;
    if (freezetable < 0)
        freezetable = vacuum_freeze_table_age;
    freezetable = Min(freezetable, autovacuum_freeze_max_age * 0.95);
    Assert(freezetable >= 0);
 
    /*
     * Compute XID limit causing an aggressive vacuum, being careful not to
     * generate a "permanent" XID
     */
    limit = ReadNextTransactionId() - freezetable;
    if (!TransactionIdIsNormal(limit))
        limit = FirstNormalTransactionId;
    if (TransactionIdPrecedesOrEquals(rel->rd_rel->relfrozenxid,
                                      limit))
        return true;
 
    /*
     * Similar to the above, determine the table freeze age to use for
     * multixacts: as specified by the caller, or
     * vacuum_multixact_freeze_table_age, but in any case not more than
     * autovacuum_multixact_freeze_table_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.
     */
    freezetable = multixact_freeze_table_age;
    if (freezetable < 0)
        freezetable = vacuum_multixact_freeze_table_age;
    freezetable = Min(freezetable,
                      effective_multixact_freeze_max_age * 0.95);
    Assert(freezetable >= 0);
 
    /*
     * Compute MultiXact limit causing an aggressive vacuum, being careful to
     * generate a valid MultiXact value
     */
    mxactLimit = ReadNextMultiXactId() - freezetable;
    if (mxactLimit < FirstMultiXactId)
        mxactLimit = FirstMultiXactId;
    if (MultiXactIdPrecedesOrEquals(rel->rd_rel->relminmxid,
                                    mxactLimit))
        return true;
 
    return false;
}

References Assert(), autovacuum_freeze_max_age, ereport, errhint(), errmsg(), FirstMultiXactId, FirstNormalTransactionId, GetOldestMultiXactId(), GetOldestNonRemovableTransactionId(), Min, MultiXactIdPrecedes(), MultiXactIdPrecedesOrEquals(), MultiXactMemberFreezeThreshold(), OldSnapshotThresholdActive(), RelationData::rd_rel, ReadNextMultiXactId(), ReadNextTransactionId(), SetOldSnapshotThresholdTimestamp(), TransactionIdIsNormal, TransactionIdLimitedForOldSnapshots(), 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_xid_failsafe_check()

bool vacuum_xid_failsafe_check	(	TransactionId	relfrozenxid,
		MultiXactId	relminmxid
	)

Definition at line 1162 of file vacuum.c.

{
    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(), TransactionIdIsNormal, TransactionIdPrecedes(), vacuum_failsafe_age, and vacuum_multixact_failsafe_age.

Referenced by lazy_check_wraparound_failsafe().

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_failsafe_age

PGDLLIMPORT int vacuum_failsafe_age

extern

Definition at line 70 of file vacuum.c.

Referenced by vacuum_xid_failsafe_check().

vacuum_freeze_min_age

PGDLLIMPORT int vacuum_freeze_min_age

extern

Definition at line 66 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_set_xid_limits().

vacuum_freeze_table_age

PGDLLIMPORT int vacuum_freeze_table_age

extern

Definition at line 67 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_set_xid_limits().

vacuum_multixact_failsafe_age

PGDLLIMPORT int vacuum_multixact_failsafe_age

extern

Definition at line 71 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 68 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_set_xid_limits().

vacuum_multixact_freeze_table_age

PGDLLIMPORT int vacuum_multixact_freeze_table_age

extern

Definition at line 69 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_set_xid_limits().

VacuumActiveNWorkers

PGDLLIMPORT pg_atomic_uint32* VacuumActiveNWorkers

extern

Definition at line 84 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 85 of file vacuum.c.

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

VacuumSharedCostBalance

PGDLLIMPORT pg_atomic_uint32* VacuumSharedCostBalance

extern

Definition at line 83 of file vacuum.c.

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