vacuum.c File Reference

#include "postgres.h"
#include <math.h>
#include "access/clog.h"
#include "access/commit_ts.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/multixact.h"
#include "access/tableam.h"
#include "access/transam.h"
#include "access/xact.h"
#include "catalog/namespace.h"
#include "catalog/pg_database.h"
#include "catalog/pg_inherits.h"
#include "commands/cluster.h"
#include "commands/defrem.h"
#include "commands/progress.h"
#include "commands/vacuum.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/bgworker_internals.h"
#include "postmaster/interrupt.h"
#include "storage/bufmgr.h"
#include "storage/lmgr.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "utils/acl.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/guc_hooks.h"
#include "utils/memutils.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"

Include dependency graph for vacuum.c:

Go to the source code of this file.

Macros
#define	PARALLEL_VACUUM_DELAY_REPORT_INTERVAL_NS   (NS_PER_S)

Functions
static List *	expand_vacuum_rel (VacuumRelation *vrel, MemoryContext vac_context, int options)
static List *	get_all_vacuum_rels (MemoryContext vac_context, int options)
static void	vac_truncate_clog (TransactionId frozenXID, MultiXactId minMulti, TransactionId lastSaneFrozenXid, MultiXactId lastSaneMinMulti)
static bool	vacuum_rel (Oid relid, RangeVar *relation, VacuumParams *params, BufferAccessStrategy bstrategy)
static double	compute_parallel_delay (void)
static VacOptValue	get_vacoptval_from_boolean (DefElem *def)
static bool	vac_tid_reaped (ItemPointer itemptr, void *state)
bool	check_vacuum_buffer_usage_limit (int *newval, void **extra, GucSource source)
void	ExecVacuum (ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
void	vacuum (List *relations, VacuumParams *params, BufferAccessStrategy bstrategy, MemoryContext vac_context, bool isTopLevel)
bool	vacuum_is_permitted_for_relation (Oid relid, Form_pg_class reltuple, bits32 options)
Relation	vacuum_open_relation (Oid relid, RangeVar *relation, bits32 options, bool verbose, LOCKMODE lmode)
bool	vacuum_get_cutoffs (Relation rel, const VacuumParams *params, struct VacuumCutoffs *cutoffs)
bool	vacuum_xid_failsafe_check (const struct VacuumCutoffs *cutoffs)
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, BlockNumber num_all_frozen_pages, bool hasindex, TransactionId frozenxid, MultiXactId minmulti, bool *frozenxid_updated, bool *minmulti_updated, bool in_outer_xact)
void	vac_update_datfrozenxid (void)
void	vac_open_indexes (Relation relation, LOCKMODE lockmode, int *nindexes, Relation **Irel)
void	vac_close_indexes (int nindexes, Relation *Irel, LOCKMODE lockmode)
void	vacuum_delay_point (bool is_analyze)
IndexBulkDeleteResult *	vac_bulkdel_one_index (IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat, TidStore *dead_items, VacDeadItemsInfo *dead_items_info)
IndexBulkDeleteResult *	vac_cleanup_one_index (IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)

Variables
int	vacuum_freeze_min_age
int	vacuum_freeze_table_age
int	vacuum_multixact_freeze_min_age
int	vacuum_multixact_freeze_table_age
int	vacuum_failsafe_age
int	vacuum_multixact_failsafe_age
double	vacuum_max_eager_freeze_failure_rate
bool	track_cost_delay_timing
bool	vacuum_truncate
double	vacuum_cost_delay = 0
int	vacuum_cost_limit = 200
int64	parallel_vacuum_worker_delay_ns = 0
bool	VacuumFailsafeActive = false
pg_atomic_uint32 *	VacuumSharedCostBalance = NULL
pg_atomic_uint32 *	VacuumActiveNWorkers = NULL
int	VacuumCostBalanceLocal = 0

Macro Definition Documentation

PARALLEL_VACUUM_DELAY_REPORT_INTERVAL_NS

#define PARALLEL_VACUUM_DELAY_REPORT_INTERVAL_NS   (NS_PER_S)

Definition at line 68 of file vacuum.c.

Function Documentation

check_vacuum_buffer_usage_limit()

bool check_vacuum_buffer_usage_limit	(	int *	newval,
		void **	extra,
		GucSource	source
	)

Definition at line 137 of file vacuum.c.

{
    /* Value upper and lower hard limits are inclusive */
    if (*newval == 0 || (*newval >= MIN_BAS_VAC_RING_SIZE_KB &&
                         *newval <= MAX_BAS_VAC_RING_SIZE_KB))
        return true;
 
    /* Value does not fall within any allowable range */
    GUC_check_errdetail("\"%s\" must be 0 or between %d kB and %d kB.",
                        "vacuum_buffer_usage_limit",
                        MIN_BAS_VAC_RING_SIZE_KB, MAX_BAS_VAC_RING_SIZE_KB);
 
    return false;
}

References GUC_check_errdetail, MAX_BAS_VAC_RING_SIZE_KB, MIN_BAS_VAC_RING_SIZE_KB, and newval.

compute_parallel_delay()

static double compute_parallel_delay ( void  )

static

Definition at line 2554 of file vacuum.c.

{
    double      msec = 0;
    uint32      shared_balance;
    int         nworkers;
 
    /* Parallel vacuum must be active */
    Assert(VacuumSharedCostBalance);
 
    nworkers = pg_atomic_read_u32(VacuumActiveNWorkers);
 
    /* At least count itself */
    Assert(nworkers >= 1);
 
    /* Update the shared cost balance value atomically */
    shared_balance = pg_atomic_add_fetch_u32(VacuumSharedCostBalance, VacuumCostBalance);
 
    /* Compute the total local balance for the current worker */
    VacuumCostBalanceLocal += VacuumCostBalance;
 
    if ((shared_balance >= vacuum_cost_limit) &&
        (VacuumCostBalanceLocal > 0.5 * ((double) vacuum_cost_limit / nworkers)))
    {
        /* Compute sleep time based on the local cost balance */
        msec = vacuum_cost_delay * VacuumCostBalanceLocal / vacuum_cost_limit;
        pg_atomic_sub_fetch_u32(VacuumSharedCostBalance, VacuumCostBalanceLocal);
        VacuumCostBalanceLocal = 0;
    }
 
    /*
     * Reset the local balance as we accumulated it into the shared value.
     */
    VacuumCostBalance = 0;
 
    return msec;
}

References Assert(), pg_atomic_add_fetch_u32(), pg_atomic_read_u32(), pg_atomic_sub_fetch_u32(), vacuum_cost_delay, vacuum_cost_limit, VacuumActiveNWorkers, VacuumCostBalance, VacuumCostBalanceLocal, and VacuumSharedCostBalance.

Referenced by vacuum_delay_point().

ExecVacuum()

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

Definition at line 160 of file vacuum.c.

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

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

Referenced by standard_ProcessUtility().

expand_vacuum_rel()

static List * expand_vacuum_rel ( VacuumRelation *  vrel, MemoryContext  vac_context, int  options  )

static

Definition at line 885 of file vacuum.c.

{
    List       *vacrels = NIL;
    MemoryContext oldcontext;
 
    /* If caller supplied OID, there's nothing we need do here. */
    if (OidIsValid(vrel->oid))
    {
        oldcontext = MemoryContextSwitchTo(vac_context);
        vacrels = lappend(vacrels, vrel);
        MemoryContextSwitchTo(oldcontext);
    }
    else
    {
        /*
         * Process a specific relation, and possibly partitions or child
         * tables thereof.
         */
        Oid         relid;
        HeapTuple   tuple;
        Form_pg_class classForm;
        bool        include_children;
        bool        is_partitioned_table;
        int         rvr_opts;
 
        /*
         * Since autovacuum workers supply OIDs when calling vacuum(), no
         * autovacuum worker should reach this code.
         */
        Assert(!AmAutoVacuumWorkerProcess());
 
        /*
         * We transiently take AccessShareLock to protect the syscache lookup
         * below, as well as find_all_inheritors's expectation that the caller
         * holds some lock on the starting relation.
         */
        rvr_opts = (options & VACOPT_SKIP_LOCKED) ? RVR_SKIP_LOCKED : 0;
        relid = RangeVarGetRelidExtended(vrel->relation,
                                         AccessShareLock,
                                         rvr_opts,
                                         NULL, NULL);
 
        /*
         * If the lock is unavailable, emit the same log statement that
         * vacuum_rel() and analyze_rel() would.
         */
        if (!OidIsValid(relid))
        {
            if (options & VACOPT_VACUUM)
                ereport(WARNING,
                        (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
                         errmsg("skipping vacuum of \"%s\" --- lock not available",
                                vrel->relation->relname)));
            else
                ereport(WARNING,
                        (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
                         errmsg("skipping analyze of \"%s\" --- lock not available",
                                vrel->relation->relname)));
            return vacrels;
        }
 
        /*
         * To check whether the relation is a partitioned table and its
         * ownership, fetch its syscache entry.
         */
        tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
        if (!HeapTupleIsValid(tuple))
            elog(ERROR, "cache lookup failed for relation %u", relid);
        classForm = (Form_pg_class) GETSTRUCT(tuple);
 
        /*
         * Make a returnable VacuumRelation for this rel if the user has the
         * required privileges.
         */
        if (vacuum_is_permitted_for_relation(relid, classForm, options))
        {
            oldcontext = MemoryContextSwitchTo(vac_context);
            vacrels = lappend(vacrels, makeVacuumRelation(vrel->relation,
                                                          relid,
                                                          vrel->va_cols));
            MemoryContextSwitchTo(oldcontext);
        }
 
        /*
         * Vacuuming a partitioned table with ONLY will not do anything since
         * the partitioned table itself is empty.  Issue a warning if the user
         * requests this.
         */
        include_children = vrel->relation->inh;
        is_partitioned_table = (classForm->relkind == RELKIND_PARTITIONED_TABLE);
        if ((options & VACOPT_VACUUM) && is_partitioned_table && !include_children)
            ereport(WARNING,
                    (errmsg("VACUUM ONLY of partitioned table \"%s\" has no effect",
                            vrel->relation->relname)));
 
        ReleaseSysCache(tuple);
 
        /*
         * Unless the user has specified ONLY, make relation list entries for
         * its partitions or inheritance child tables.  Note that the list
         * returned by find_all_inheritors() includes the passed-in OID, so we
         * have to skip that.  There's no point in taking locks on the
         * individual partitions or child tables yet, and doing so would just
         * add unnecessary deadlock risk.  For this last reason, we do not yet
         * check the ownership of the partitions/tables, which get added to
         * the list to process.  Ownership will be checked later on anyway.
         */
        if (include_children)
        {
            List       *part_oids = find_all_inheritors(relid, NoLock, NULL);
            ListCell   *part_lc;
 
            foreach(part_lc, part_oids)
            {
                Oid         part_oid = lfirst_oid(part_lc);
 
                if (part_oid == relid)
                    continue;   /* ignore original table */
 
                /*
                 * We omit a RangeVar since it wouldn't be appropriate to
                 * complain about failure to open one of these relations
                 * later.
                 */
                oldcontext = MemoryContextSwitchTo(vac_context);
                vacrels = lappend(vacrels, makeVacuumRelation(NULL,
                                                              part_oid,
                                                              vrel->va_cols));
                MemoryContextSwitchTo(oldcontext);
            }
        }
 
        /*
         * Release lock again.  This means that by the time we actually try to
         * process the table, it might be gone or renamed.  In the former case
         * we'll silently ignore it; in the latter case we'll process it
         * anyway, but we must beware that the RangeVar doesn't necessarily
         * identify it anymore.  This isn't ideal, perhaps, but there's little
         * practical alternative, since we're typically going to commit this
         * transaction and begin a new one between now and then.  Moreover,
         * holding locks on multiple relations would create significant risk
         * of deadlock.
         */
        UnlockRelationOid(relid, AccessShareLock);
    }
 
    return vacrels;
}

References AccessShareLock, AmAutoVacuumWorkerProcess, Assert(), elog, ereport, errcode(), errmsg(), ERROR, find_all_inheritors(), GETSTRUCT(), HeapTupleIsValid, RangeVar::inh, lappend(), lfirst_oid, makeVacuumRelation(), MemoryContextSwitchTo(), NIL, NoLock, ObjectIdGetDatum(), VacuumRelation::oid, OidIsValid, RangeVarGetRelidExtended(), VacuumRelation::relation, ReleaseSysCache(), RangeVar::relname, RVR_SKIP_LOCKED, SearchSysCache1(), UnlockRelationOid(), VacuumRelation::va_cols, VACOPT_SKIP_LOCKED, VACOPT_VACUUM, vacuum_is_permitted_for_relation(), and WARNING.

Referenced by vacuum().

get_all_vacuum_rels()

static List * get_all_vacuum_rels ( MemoryContext  vac_context, int  options  )

static

Definition at line 1040 of file vacuum.c.

{
    List       *vacrels = NIL;
    Relation    pgclass;
    TableScanDesc scan;
    HeapTuple   tuple;
 
    pgclass = table_open(RelationRelationId, AccessShareLock);
 
    scan = table_beginscan_catalog(pgclass, 0, NULL);
 
    while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
    {
        Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
        MemoryContext oldcontext;
        Oid         relid = classForm->oid;
 
        /*
         * We include partitioned tables here; depending on which operation is
         * to be performed, caller will decide whether to process or ignore
         * them.
         */
        if (classForm->relkind != RELKIND_RELATION &&
            classForm->relkind != RELKIND_MATVIEW &&
            classForm->relkind != RELKIND_PARTITIONED_TABLE)
            continue;
 
        /* check permissions of relation */
        if (!vacuum_is_permitted_for_relation(relid, classForm, options))
            continue;
 
        /*
         * Build VacuumRelation(s) specifying the table OIDs to be processed.
         * We omit a RangeVar since it wouldn't be appropriate to complain
         * about failure to open one of these relations later.
         */
        oldcontext = MemoryContextSwitchTo(vac_context);
        vacrels = lappend(vacrels, makeVacuumRelation(NULL,
                                                      relid,
                                                      NIL));
        MemoryContextSwitchTo(oldcontext);
    }
 
    table_endscan(scan);
    table_close(pgclass, AccessShareLock);
 
    return vacrels;
}

References AccessShareLock, ForwardScanDirection, GETSTRUCT(), heap_getnext(), lappend(), makeVacuumRelation(), MemoryContextSwitchTo(), NIL, table_beginscan_catalog(), table_close(), table_endscan(), table_open(), and vacuum_is_permitted_for_relation().

Referenced by vacuum().

get_vacoptval_from_boolean()

static VacOptValue get_vacoptval_from_boolean ( DefElem *  def )

static

Definition at line 2598 of file vacuum.c.

{
    return defGetBoolean(def) ? VACOPTVALUE_ENABLED : VACOPTVALUE_DISABLED;
}

References defGetBoolean(), VACOPTVALUE_DISABLED, and VACOPTVALUE_ENABLED.

Referenced by ExecVacuum().

vac_bulkdel_one_index()

IndexBulkDeleteResult * vac_bulkdel_one_index	(	IndexVacuumInfo *	ivinfo,
		IndexBulkDeleteResult *	istat,
		TidStore *	dead_items,
		VacDeadItemsInfo *	dead_items_info
	)

Definition at line 2609 of file vacuum.c.

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

References ereport, errmsg(), IndexVacuumInfo::index, index_bulk_delete(), IndexVacuumInfo::message_level, VacDeadItemsInfo::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 2630 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 2381 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 1332 of file vacuum.c.

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

References RelationData::rd_rel.

Referenced by lazy_scan_heap(), and statapprox_heap().

vac_open_indexes()

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

Definition at line 2338 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_tid_reaped()

static bool vac_tid_reaped ( ItemPointer  itemptr, void *  state  )

static

Definition at line 2656 of file vacuum.c.

{
    TidStore   *dead_items = (TidStore *) state;
 
    return TidStoreIsMember(dead_items, itemptr);
}

References TidStoreIsMember().

Referenced by vac_bulkdel_one_index().

vac_truncate_clog()

static void vac_truncate_clog ( TransactionId  frozenXID, MultiXactId  minMulti, TransactionId  lastSaneFrozenXid, MultiXactId  lastSaneMinMulti  )

static

Definition at line 1829 of file vacuum.c.

{
    TransactionId nextXID = ReadNextTransactionId();
    Relation    relation;
    TableScanDesc scan;
    HeapTuple   tuple;
    Oid         oldestxid_datoid;
    Oid         minmulti_datoid;
    bool        bogus = false;
    bool        frozenAlreadyWrapped = false;
 
    /* Restrict task to one backend per cluster; see SimpleLruTruncate(). */
    LWLockAcquire(WrapLimitsVacuumLock, LW_EXCLUSIVE);
 
    /* init oldest datoids to sync with my frozenXID/minMulti values */
    oldestxid_datoid = MyDatabaseId;
    minmulti_datoid = MyDatabaseId;
 
    /*
     * Scan pg_database to compute the minimum datfrozenxid/datminmxid
     *
     * Since vac_update_datfrozenxid updates datfrozenxid/datminmxid in-place,
     * the values could change while we look at them.  Fetch each one just
     * once to ensure sane behavior of the comparison logic.  (Here, as in
     * many other places, we assume that fetching or updating an XID in shared
     * storage is atomic.)
     *
     * Note: we need not worry about a race condition with new entries being
     * inserted by CREATE DATABASE.  Any such entry will have a copy of some
     * existing DB's datfrozenxid, and that source DB cannot be ours because
     * of the interlock against copying a DB containing an active backend.
     * Hence the new entry will not reduce the minimum.  Also, if two VACUUMs
     * concurrently modify the datfrozenxid's of different databases, the
     * worst possible outcome is that pg_xact is not truncated as aggressively
     * as it could be.
     */
    relation = table_open(DatabaseRelationId, AccessShareLock);
 
    scan = table_beginscan_catalog(relation, 0, NULL);
 
    while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
    {
        volatile FormData_pg_database *dbform = (Form_pg_database) GETSTRUCT(tuple);
        TransactionId datfrozenxid = dbform->datfrozenxid;
        TransactionId datminmxid = dbform->datminmxid;
 
        Assert(TransactionIdIsNormal(datfrozenxid));
        Assert(MultiXactIdIsValid(datminmxid));
 
        /*
         * If database is in the process of getting dropped, or has been
         * interrupted while doing so, no connections to it are possible
         * anymore. Therefore we don't need to take it into account here.
         * Which is good, because it can't be processed by autovacuum either.
         */
        if (database_is_invalid_form((Form_pg_database) dbform))
        {
            elog(DEBUG2,
                 "skipping invalid database \"%s\" while computing relfrozenxid",
                 NameStr(dbform->datname));
            continue;
        }
 
        /*
         * If things are working properly, no database should have a
         * datfrozenxid or datminmxid 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 before those
         * databases have been scanned and cleaned up.  (We will issue the
         * "already wrapped" warning if appropriate, though.)
         */
        if (TransactionIdPrecedes(lastSaneFrozenXid, datfrozenxid) ||
            MultiXactIdPrecedes(lastSaneMinMulti, datminmxid))
            bogus = true;
 
        if (TransactionIdPrecedes(nextXID, datfrozenxid))
            frozenAlreadyWrapped = true;
        else if (TransactionIdPrecedes(datfrozenxid, frozenXID))
        {
            frozenXID = datfrozenxid;
            oldestxid_datoid = dbform->oid;
        }
 
        if (MultiXactIdPrecedes(datminmxid, minMulti))
        {
            minMulti = datminmxid;
            minmulti_datoid = dbform->oid;
        }
    }
 
    table_endscan(scan);
 
    table_close(relation, AccessShareLock);
 
    /*
     * Do not truncate CLOG if we seem to have suffered wraparound already;
     * the computed minimum XID might be bogus.  This case should now be
     * impossible due to the defenses in GetNewTransactionId, but we keep the
     * test anyway.
     */
    if (frozenAlreadyWrapped)
    {
        ereport(WARNING,
                (errmsg("some databases have not been vacuumed in over 2 billion transactions"),
                 errdetail("You might have already suffered transaction-wraparound data loss.")));
        LWLockRelease(WrapLimitsVacuumLock);
        return;
    }
 
    /* chicken out if data is bogus in any other way */
    if (bogus)
    {
        LWLockRelease(WrapLimitsVacuumLock);
        return;
    }
 
    /*
     * Advance the oldest value for commit timestamps before truncating, so
     * that if a user requests a timestamp for a transaction we're truncating
     * away right after this point, they get NULL instead of an ugly "file not
     * found" error from slru.c.  This doesn't matter for xact/multixact
     * because they are not subject to arbitrary lookups from users.
     */
    AdvanceOldestCommitTsXid(frozenXID);
 
    /*
     * Truncate CLOG, multixact and CommitTs to the oldest computed value.
     */
    TruncateCLOG(frozenXID, oldestxid_datoid);
    TruncateCommitTs(frozenXID);
    TruncateMultiXact(minMulti, minmulti_datoid);
 
    /*
     * Update the wrap limit for GetNewTransactionId and creation of new
     * MultiXactIds.  Note: these functions will also signal the postmaster
     * for an(other) autovac cycle if needed.   XXX should we avoid possibly
     * signaling twice?
     */
    SetTransactionIdLimit(frozenXID, oldestxid_datoid);
    SetMultiXactIdLimit(minMulti, minmulti_datoid, false);
 
    LWLockRelease(WrapLimitsVacuumLock);
}

References AccessShareLock, AdvanceOldestCommitTsXid(), Assert(), database_is_invalid_form(), datfrozenxid, datminmxid, DEBUG2, elog, ereport, errdetail(), errmsg(), FormData_pg_database, ForwardScanDirection, GETSTRUCT(), heap_getnext(), LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MultiXactIdIsValid, MultiXactIdPrecedes(), MyDatabaseId, NameStr, ReadNextTransactionId(), SetMultiXactIdLimit(), SetTransactionIdLimit(), table_beginscan_catalog(), table_close(), table_endscan(), table_open(), TransactionIdIsNormal, TransactionIdPrecedes(), TruncateCLOG(), TruncateCommitTs(), TruncateMultiXact(), and WARNING.

Referenced by vac_update_datfrozenxid().

vac_update_datfrozenxid()

void vac_update_datfrozenxid

(

void

)

Definition at line 1610 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];
    void       *inplace_state;
 
    /*
     * 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.
     *
     * See vac_truncate_clog() for the race condition to prevent.
     */
    relation = table_open(RelationRelationId, AccessShareLock);
 
    scan = systable_beginscan(relation, InvalidOid, false,
                              NULL, 0, NULL);
 
    while ((classTup = systable_getnext(scan)) != NULL)
    {
        volatile FormData_pg_class *classForm = (Form_pg_class) GETSTRUCT(classTup);
        TransactionId relfrozenxid = classForm->relfrozenxid;
        TransactionId relminmxid = classForm->relminmxid;
 
        /*
         * 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(relfrozenxid));
            Assert(!MultiXactIdIsValid(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(relfrozenxid))
        {
            Assert(TransactionIdIsNormal(relfrozenxid));
 
            /* check for values in the future */
            if (TransactionIdPrecedes(lastSaneFrozenXid, relfrozenxid))
            {
                bogus = true;
                break;
            }
 
            /* determine new horizon */
            if (TransactionIdPrecedes(relfrozenxid, newFrozenXid))
                newFrozenXid = relfrozenxid;
        }
 
        if (MultiXactIdIsValid(relminmxid))
        {
            /* check for values in the future */
            if (MultiXactIdPrecedes(lastSaneMinMulti, relminmxid))
            {
                bogus = true;
                break;
            }
 
            /* determine new horizon */
            if (MultiXactIdPrecedes(relminmxid, newMinMulti))
                newMinMulti = 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);
 
    /*
     * Fetch a copy of the tuple to scribble on.  We could check the syscache
     * tuple first.  If that concluded !dirty, we'd avoid waiting on
     * concurrent heap_update() and would avoid exclusive-locking the buffer.
     * For now, don't optimize that.
     */
    ScanKeyInit(&key[0],
                Anum_pg_database_oid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(MyDatabaseId));
 
    systable_inplace_update_begin(relation, DatabaseOidIndexId, true,
                                  NULL, 1, key, &tuple, &inplace_state);
 
    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)
        systable_inplace_update_finish(inplace_state, tuple);
    else
        systable_inplace_update_cancel(inplace_state);
 
    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(), FormData_pg_class, GetOldestMultiXactId(), GetOldestNonRemovableTransactionId(), GETSTRUCT(), heap_freetuple(), HeapTupleIsValid, InvalidOid, sort-test::key, LockDatabaseFrozenIds(), MultiXactIdIsValid, MultiXactIdPrecedes(), MyDatabaseId, ObjectIdGetDatum(), ReadNextMultiXactId(), ReadNextTransactionId(), RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), systable_inplace_update_begin(), systable_inplace_update_cancel(), systable_inplace_update_finish(), 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,
		BlockNumber	num_all_frozen_pages,
		bool	hasindex,
		TransactionId	frozenxid,
		MultiXactId	minmulti,
		bool *	frozenxid_updated,
		bool *	minmulti_updated,
		bool	in_outer_xact
	)

Definition at line 1428 of file vacuum.c.

{
    Oid         relid = RelationGetRelid(relation);
    Relation    rd;
    ScanKeyData key[1];
    HeapTuple   ctup;
    void       *inplace_state;
    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 */
    ScanKeyInit(&key[0],
                Anum_pg_class_oid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));
    systable_inplace_update_begin(rd, ClassOidIndexId, true,
                                  NULL, 1, key, &ctup, &inplace_state);
    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;
    }
    if (pgcform->relallfrozen != (int32) num_all_frozen_pages)
    {
        pgcform->relallfrozen = (int32) num_all_frozen_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)
        systable_inplace_update_finish(inplace_state, ctup);
    else
        systable_inplace_update_cancel(inplace_state);
 
    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 BTEqualStrategyNumber, elog, ereport, errcode(), ERRCODE_DATA_CORRUPTED, errmsg_internal(), ERROR, GETSTRUCT(), HeapTupleIsValid, sort-test::key, MultiXactIdIsValid, MultiXactIdPrecedes(), ObjectIdGetDatum(), RelationData::rd_rules, ReadNextMultiXactId(), ReadNextTransactionId(), RelationGetRelationName, RelationGetRelid, RowExclusiveLock, ScanKeyInit(), systable_inplace_update_begin(), systable_inplace_update_cancel(), systable_inplace_update_finish(), table_close(), table_open(), TransactionIdIsNormal, TransactionIdPrecedes(), RelationData::trigdesc, and WARNING.

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

vacuum()

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

Definition at line 496 of file vacuum.c.

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

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

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

vacuum_delay_point()

void vacuum_delay_point

(

bool

is_analyze

)

Definition at line 2402 of file vacuum.c.

{
    double      msec = 0;
 
    /* Always check for interrupts */
    CHECK_FOR_INTERRUPTS();
 
    if (InterruptPending ||
        (!VacuumCostActive && !ConfigReloadPending))
        return;
 
    /*
     * Autovacuum workers should reload the configuration file if requested.
     * This allows changes to [autovacuum_]vacuum_cost_limit and
     * [autovacuum_]vacuum_cost_delay to take effect while a table is being
     * vacuumed or analyzed.
     */
    if (ConfigReloadPending && AmAutoVacuumWorkerProcess())
    {
        ConfigReloadPending = false;
        ProcessConfigFile(PGC_SIGHUP);
        VacuumUpdateCosts();
    }
 
    /*
     * If we disabled cost-based delays after reloading the config file,
     * return.
     */
    if (!VacuumCostActive)
        return;
 
    /*
     * For parallel vacuum, the delay is computed based on the shared cost
     * balance.  See compute_parallel_delay.
     */
    if (VacuumSharedCostBalance != NULL)
        msec = compute_parallel_delay();
    else if (VacuumCostBalance >= vacuum_cost_limit)
        msec = vacuum_cost_delay * VacuumCostBalance / vacuum_cost_limit;
 
    /* Nap if appropriate */
    if (msec > 0)
    {
        instr_time  delay_start;
 
        if (msec > vacuum_cost_delay * 4)
            msec = vacuum_cost_delay * 4;
 
        if (track_cost_delay_timing)
            INSTR_TIME_SET_CURRENT(delay_start);
 
        pgstat_report_wait_start(WAIT_EVENT_VACUUM_DELAY);
        pg_usleep(msec * 1000);
        pgstat_report_wait_end();
 
        if (track_cost_delay_timing)
        {
            instr_time  delay_end;
            instr_time  delay;
 
            INSTR_TIME_SET_CURRENT(delay_end);
            INSTR_TIME_SET_ZERO(delay);
            INSTR_TIME_ACCUM_DIFF(delay, delay_end, delay_start);
 
            /*
             * For parallel workers, we only report the delay time every once
             * in a while to avoid overloading the leader with messages and
             * interrupts.
             */
            if (IsParallelWorker())
            {
                static instr_time last_report_time;
                instr_time  time_since_last_report;
 
                Assert(!is_analyze);
 
                /* Accumulate the delay time */
                parallel_vacuum_worker_delay_ns += INSTR_TIME_GET_NANOSEC(delay);
 
                /* Calculate interval since last report */
                INSTR_TIME_SET_ZERO(time_since_last_report);
                INSTR_TIME_ACCUM_DIFF(time_since_last_report, delay_end, last_report_time);
 
                /* If we haven't reported in a while, do so now */
                if (INSTR_TIME_GET_NANOSEC(time_since_last_report) >=
                    PARALLEL_VACUUM_DELAY_REPORT_INTERVAL_NS)
                {
                    pgstat_progress_parallel_incr_param(PROGRESS_VACUUM_DELAY_TIME,
                                                        parallel_vacuum_worker_delay_ns);
 
                    /* Reset variables */
                    last_report_time = delay_end;
                    parallel_vacuum_worker_delay_ns = 0;
                }
            }
            else if (is_analyze)
                pgstat_progress_incr_param(PROGRESS_ANALYZE_DELAY_TIME,
                                           INSTR_TIME_GET_NANOSEC(delay));
            else
                pgstat_progress_incr_param(PROGRESS_VACUUM_DELAY_TIME,
                                           INSTR_TIME_GET_NANOSEC(delay));
        }
 
        /*
         * We don't want to ignore postmaster death during very long vacuums
         * with vacuum_cost_delay configured.  We can't use the usual
         * WaitLatch() approach here because we want microsecond-based sleep
         * durations above.
         */
        if (IsUnderPostmaster && !PostmasterIsAlive())
            exit(1);
 
        VacuumCostBalance = 0;
 
        /*
         * Balance and update limit values for autovacuum workers. We must do
         * this periodically, as the number of workers across which we are
         * balancing the limit may have changed.
         *
         * TODO: There may be better criteria for determining when to do this
         * besides "check after napping".
         */
        AutoVacuumUpdateCostLimit();
 
        /* Might have gotten an interrupt while sleeping */
        CHECK_FOR_INTERRUPTS();
    }
}

References AmAutoVacuumWorkerProcess, Assert(), AutoVacuumUpdateCostLimit(), CHECK_FOR_INTERRUPTS, compute_parallel_delay(), ConfigReloadPending, INSTR_TIME_ACCUM_DIFF, INSTR_TIME_GET_NANOSEC, INSTR_TIME_SET_CURRENT, INSTR_TIME_SET_ZERO, InterruptPending, IsParallelWorker, IsUnderPostmaster, PARALLEL_VACUUM_DELAY_REPORT_INTERVAL_NS, parallel_vacuum_worker_delay_ns, pg_usleep(), PGC_SIGHUP, pgstat_progress_incr_param(), pgstat_progress_parallel_incr_param(), pgstat_report_wait_end(), pgstat_report_wait_start(), PostmasterIsAlive, ProcessConfigFile(), PROGRESS_ANALYZE_DELAY_TIME, PROGRESS_VACUUM_DELAY_TIME, track_cost_delay_timing, vacuum_cost_delay, vacuum_cost_limit, VacuumCostActive, VacuumCostBalance, VacuumSharedCostBalance, and VacuumUpdateCosts().

Referenced by acquire_sample_rows(), blbulkdelete(), blvacuumcleanup(), btvacuumpage(), btvacuumscan(), 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(), gistvacuumscan(), hashbucketcleanup(), lazy_scan_heap(), lazy_vacuum_heap_rel(), spgprocesspending(), and spgvacuumscan().

vacuum_get_cutoffs()

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

Definition at line 1102 of file vacuum.c.

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

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

Referenced by copy_table_data(), and heap_vacuum_rel().

vacuum_is_permitted_for_relation()

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

Definition at line 721 of file vacuum.c.

{
    char       *relname;
 
    Assert((options & (VACOPT_VACUUM | VACOPT_ANALYZE)) != 0);
 
    /*----------
     * A role has privileges to vacuum or analyze the relation if any of the
     * following are true:
     *   - the role owns the current database and the relation is not shared
     *   - the role has the MAINTAIN privilege on the relation
     *----------
     */
    if ((object_ownercheck(DatabaseRelationId, MyDatabaseId, GetUserId()) &&
         !reltuple->relisshared) ||
        pg_class_aclcheck(relid, GetUserId(), ACL_MAINTAIN) == ACLCHECK_OK)
        return true;
 
    relname = NameStr(reltuple->relname);
 
    if ((options & VACOPT_VACUUM) != 0)
    {
        ereport(WARNING,
                (errmsg("permission denied to vacuum \"%s\", skipping it",
                        relname)));
 
        /*
         * For VACUUM ANALYZE, both logs could show up, but just generate
         * information for VACUUM as that would be the first one to be
         * processed.
         */
        return false;
    }
 
    if ((options & VACOPT_ANALYZE) != 0)
        ereport(WARNING,
                (errmsg("permission denied to analyze \"%s\", skipping it",
                        relname)));
 
    return false;
}

References ACL_MAINTAIN, ACLCHECK_OK, Assert(), ereport, errmsg(), GetUserId(), MyDatabaseId, NameStr, object_ownercheck(), pg_class_aclcheck(), 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 773 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 (!AmAutoVacuumWorkerProcess())
        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 AmAutoVacuumWorkerProcess, Assert(), ConditionalLockRelationOid(), ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errmsg(), 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_rel()

static bool vacuum_rel ( Oid  relid, RangeVar *  relation, VacuumParams *  params, BufferAccessStrategy  bstrategy  )

static

Definition at line 1998 of file vacuum.c.

{
    LOCKMODE    lmode;
    Relation    rel;
    LockRelId   lockrelid;
    Oid         priv_relid;
    Oid         toast_relid;
    Oid         save_userid;
    int         save_sec_context;
    int         save_nestlevel;
 
    Assert(params != NULL);
 
    /* Begin a transaction for vacuuming this relation */
    StartTransactionCommand();
 
    if (!(params->options & VACOPT_FULL))
    {
        /*
         * In lazy vacuum, we can set the PROC_IN_VACUUM flag, which lets
         * other concurrent VACUUMs know that they can ignore this one while
         * determining their OldestXmin.  (The reason we don't set it during a
         * full VACUUM is exactly that we may have to run user-defined
         * functions for functional indexes, and we want to make sure that if
         * they use the snapshot set above, any tuples it requires can't get
         * removed from other tables.  An index function that depends on the
         * contents of other tables is arguably broken, but we won't break it
         * here by violating transaction semantics.)
         *
         * We also set the VACUUM_FOR_WRAPAROUND flag, which is passed down by
         * autovacuum; it's used to avoid canceling a vacuum that was invoked
         * in an emergency.
         *
         * Note: these flags remain set until CommitTransaction or
         * AbortTransaction.  We don't want to clear them until we reset
         * MyProc->xid/xmin, otherwise GetOldestNonRemovableTransactionId()
         * might appear to go backwards, which is probably Not Good.  (We also
         * set PROC_IN_VACUUM *before* taking our own snapshot, so that our
         * xmin doesn't become visible ahead of setting the flag.)
         */
        LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
        MyProc->statusFlags |= PROC_IN_VACUUM;
        if (params->is_wraparound)
            MyProc->statusFlags |= PROC_VACUUM_FOR_WRAPAROUND;
        ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
        LWLockRelease(ProcArrayLock);
    }
 
    /*
     * Need to acquire a snapshot to prevent pg_subtrans from being truncated,
     * cutoff xids in local memory wrapping around, and to have updated xmin
     * horizons.
     */
    PushActiveSnapshot(GetTransactionSnapshot());
 
    /*
     * Check for user-requested abort.  Note we want this to be inside a
     * transaction, so xact.c doesn't issue useless WARNING.
     */
    CHECK_FOR_INTERRUPTS();
 
    /*
     * Determine the type of lock we want --- hard exclusive lock for a FULL
     * vacuum, but just ShareUpdateExclusiveLock for concurrent vacuum. Either
     * way, we can be sure that no other backend is vacuuming the same table.
     */
    lmode = (params->options & VACOPT_FULL) ?
        AccessExclusiveLock : ShareUpdateExclusiveLock;
 
    /* open the relation and get the appropriate lock on it */
    rel = vacuum_open_relation(relid, relation, params->options,
                               params->log_min_duration >= 0, lmode);
 
    /* leave if relation could not be opened or locked */
    if (!rel)
    {
        PopActiveSnapshot();
        CommitTransactionCommand();
        return false;
    }
 
    /*
     * When recursing to a TOAST table, check privileges on the parent.  NB:
     * This is only safe to do because we hold a session lock on the main
     * relation that prevents concurrent deletion.
     */
    if (OidIsValid(params->toast_parent))
        priv_relid = params->toast_parent;
    else
        priv_relid = RelationGetRelid(rel);
 
    /*
     * Check if relation needs to be skipped based on privileges.  This check
     * happens also when building the relation list to vacuum for a manual
     * operation, and needs to be done additionally here as VACUUM could
     * happen across multiple transactions where privileges could have changed
     * in-between.  Make sure to only generate logs for VACUUM in this case.
     */
    if (!vacuum_is_permitted_for_relation(priv_relid,
                                          rel->rd_rel,
                                          params->options & ~VACOPT_ANALYZE))
    {
        relation_close(rel, lmode);
        PopActiveSnapshot();
        CommitTransactionCommand();
        return false;
    }
 
    /*
     * Check that it's of a vacuumable relkind.
     */
    if (rel->rd_rel->relkind != RELKIND_RELATION &&
        rel->rd_rel->relkind != RELKIND_MATVIEW &&
        rel->rd_rel->relkind != RELKIND_TOASTVALUE &&
        rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
    {
        ereport(WARNING,
                (errmsg("skipping \"%s\" --- cannot vacuum non-tables or special system tables",
                        RelationGetRelationName(rel))));
        relation_close(rel, lmode);
        PopActiveSnapshot();
        CommitTransactionCommand();
        return false;
    }
 
    /*
     * Silently ignore tables that are temp tables of other backends ---
     * trying to vacuum these will lead to great unhappiness, 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
     * VACUUM.)
     */
    if (RELATION_IS_OTHER_TEMP(rel))
    {
        relation_close(rel, lmode);
        PopActiveSnapshot();
        CommitTransactionCommand();
        return false;
    }
 
    /*
     * Silently ignore partitioned tables as there is no work to be done.  The
     * useful work is on their child partitions, which have been queued up for
     * us separately.
     */
    if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
    {
        relation_close(rel, lmode);
        PopActiveSnapshot();
        CommitTransactionCommand();
        /* It's OK to proceed with ANALYZE on this table */
        return true;
    }
 
    /*
     * Get a session-level lock too. This will protect our access to the
     * relation across multiple transactions, so that we can vacuum the
     * relation's TOAST table (if any) secure in the knowledge that no one is
     * deleting the parent relation.
     *
     * NOTE: this cannot block, even if someone else is waiting for access,
     * because the lock manager knows that both lock requests are from the
     * same process.
     */
    lockrelid = rel->rd_lockInfo.lockRelId;
    LockRelationIdForSession(&lockrelid, lmode);
 
    /*
     * Set index_cleanup option based on index_cleanup reloption if it wasn't
     * specified in VACUUM command, or when running in an autovacuum worker
     */
    if (params->index_cleanup == VACOPTVALUE_UNSPECIFIED)
    {
        StdRdOptIndexCleanup vacuum_index_cleanup;
 
        if (rel->rd_options == NULL)
            vacuum_index_cleanup = STDRD_OPTION_VACUUM_INDEX_CLEANUP_AUTO;
        else
            vacuum_index_cleanup =
                ((StdRdOptions *) rel->rd_options)->vacuum_index_cleanup;
 
        if (vacuum_index_cleanup == STDRD_OPTION_VACUUM_INDEX_CLEANUP_AUTO)
            params->index_cleanup = VACOPTVALUE_AUTO;
        else if (vacuum_index_cleanup == STDRD_OPTION_VACUUM_INDEX_CLEANUP_ON)
            params->index_cleanup = VACOPTVALUE_ENABLED;
        else
        {
            Assert(vacuum_index_cleanup ==
                   STDRD_OPTION_VACUUM_INDEX_CLEANUP_OFF);
            params->index_cleanup = VACOPTVALUE_DISABLED;
        }
    }
 
    /*
     * Check if the vacuum_max_eager_freeze_failure_rate table storage
     * parameter was specified. This overrides the GUC value.
     */
    if (rel->rd_options != NULL &&
        ((StdRdOptions *) rel->rd_options)->vacuum_max_eager_freeze_failure_rate >= 0)
        params->max_eager_freeze_failure_rate =
            ((StdRdOptions *) rel->rd_options)->vacuum_max_eager_freeze_failure_rate;
 
    /*
     * Set truncate option based on truncate reloption or GUC if it wasn't
     * specified in VACUUM command, or when running in an autovacuum worker
     */
    if (params->truncate == VACOPTVALUE_UNSPECIFIED)
    {
        StdRdOptions *opts = (StdRdOptions *) rel->rd_options;
 
        if (opts && opts->vacuum_truncate_set)
        {
            if (opts->vacuum_truncate)
                params->truncate = VACOPTVALUE_ENABLED;
            else
                params->truncate = VACOPTVALUE_DISABLED;
        }
        else if (vacuum_truncate)
            params->truncate = VACOPTVALUE_ENABLED;
        else
            params->truncate = VACOPTVALUE_DISABLED;
    }
 
    /*
     * Remember the relation's TOAST relation for later, if the caller asked
     * us to process it.  In VACUUM FULL, though, the toast table is
     * automatically rebuilt by cluster_rel so we shouldn't recurse to it,
     * unless PROCESS_MAIN is disabled.
     */
    if ((params->options & VACOPT_PROCESS_TOAST) != 0 &&
        ((params->options & VACOPT_FULL) == 0 ||
         (params->options & VACOPT_PROCESS_MAIN) == 0))
        toast_relid = rel->rd_rel->reltoastrelid;
    else
        toast_relid = InvalidOid;
 
    /*
     * Switch to the table owner's userid, so that any index functions are run
     * as that user.  Also lock down security-restricted operations and
     * arrange to make GUC variable changes local to this command. (This is
     * unnecessary, but harmless, for lazy VACUUM.)
     */
    GetUserIdAndSecContext(&save_userid, &save_sec_context);
    SetUserIdAndSecContext(rel->rd_rel->relowner,
                           save_sec_context | SECURITY_RESTRICTED_OPERATION);
    save_nestlevel = NewGUCNestLevel();
    RestrictSearchPath();
 
    /*
     * If PROCESS_MAIN is set (the default), it's time to vacuum the main
     * relation.  Otherwise, we can skip this part.  If processing the TOAST
     * table is required (e.g., PROCESS_TOAST is set), we force PROCESS_MAIN
     * to be set when we recurse to the TOAST table.
     */
    if (params->options & VACOPT_PROCESS_MAIN)
    {
        /*
         * Do the actual work --- either FULL or "lazy" vacuum
         */
        if (params->options & VACOPT_FULL)
        {
            ClusterParams cluster_params = {0};
 
            if ((params->options & VACOPT_VERBOSE) != 0)
                cluster_params.options |= CLUOPT_VERBOSE;
 
            /* VACUUM FULL is now a variant of CLUSTER; see cluster.c */
            cluster_rel(rel, InvalidOid, &cluster_params);
            /* cluster_rel closes the relation, but keeps lock */
 
            rel = NULL;
        }
        else
            table_relation_vacuum(rel, params, bstrategy);
    }
 
    /* Roll back any GUC changes executed by index functions */
    AtEOXact_GUC(false, save_nestlevel);
 
    /* Restore userid and security context */
    SetUserIdAndSecContext(save_userid, save_sec_context);
 
    /* all done with this class, but hold lock until commit */
    if (rel)
        relation_close(rel, NoLock);
 
    /*
     * Complete the transaction and free all temporary memory used.
     */
    PopActiveSnapshot();
    CommitTransactionCommand();
 
    /*
     * If the relation has a secondary toast rel, vacuum that too while we
     * still hold the session lock on the main table.  Note however that
     * "analyze" will not get done on the toast table.  This is good, because
     * the toaster always uses hardcoded index access and statistics are
     * totally unimportant for toast relations.
     */
    if (toast_relid != InvalidOid)
    {
        VacuumParams toast_vacuum_params;
 
        /*
         * Force VACOPT_PROCESS_MAIN so vacuum_rel() processes it.  Likewise,
         * set toast_parent so that the privilege checks are done on the main
         * relation.  NB: This is only safe to do because we hold a session
         * lock on the main relation that prevents concurrent deletion.
         */
        memcpy(&toast_vacuum_params, params, sizeof(VacuumParams));
        toast_vacuum_params.options |= VACOPT_PROCESS_MAIN;
        toast_vacuum_params.toast_parent = relid;
 
        vacuum_rel(toast_relid, NULL, &toast_vacuum_params, bstrategy);
    }
 
    /*
     * Now release the session-level lock on the main table.
     */
    UnlockRelationIdForSession(&lockrelid, lmode);
 
    /* Report that we really did it. */
    return true;
}

References AccessExclusiveLock, Assert(), AtEOXact_GUC(), CHECK_FOR_INTERRUPTS, CLUOPT_VERBOSE, cluster_rel(), CommitTransactionCommand(), ereport, errmsg(), GetTransactionSnapshot(), GetUserIdAndSecContext(), if(), VacuumParams::index_cleanup, InvalidOid, VacuumParams::is_wraparound, LockRelationIdForSession(), LockInfoData::lockRelId, VacuumParams::log_min_duration, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), VacuumParams::max_eager_freeze_failure_rate, MyProc, NewGUCNestLevel(), NoLock, OidIsValid, ClusterParams::options, VacuumParams::options, opts, PGPROC::pgxactoff, PopActiveSnapshot(), PROC_IN_VACUUM, PROC_VACUUM_FOR_WRAPAROUND, ProcGlobal, PushActiveSnapshot(), RelationData::rd_lockInfo, RelationData::rd_options, RelationData::rd_rel, relation_close(), RELATION_IS_OTHER_TEMP, RelationGetRelationName, RelationGetRelid, RestrictSearchPath(), SECURITY_RESTRICTED_OPERATION, SetUserIdAndSecContext(), ShareUpdateExclusiveLock, StartTransactionCommand(), PGPROC::statusFlags, PROC_HDR::statusFlags, STDRD_OPTION_VACUUM_INDEX_CLEANUP_AUTO, STDRD_OPTION_VACUUM_INDEX_CLEANUP_OFF, STDRD_OPTION_VACUUM_INDEX_CLEANUP_ON, table_relation_vacuum(), VacuumParams::toast_parent, VacuumParams::truncate, UnlockRelationIdForSession(), VACOPT_ANALYZE, VACOPT_FULL, VACOPT_PROCESS_MAIN, VACOPT_PROCESS_TOAST, VACOPT_VERBOSE, VACOPTVALUE_AUTO, VACOPTVALUE_DISABLED, VACOPTVALUE_ENABLED, VACOPTVALUE_UNSPECIFIED, vacuum_is_permitted_for_relation(), vacuum_open_relation(), vacuum_rel(), vacuum_truncate, and WARNING.

Referenced by vacuum(), and vacuum_rel().

vacuum_xid_failsafe_check()

bool vacuum_xid_failsafe_check

(

const struct VacuumCutoffs *

cutoffs

)

Definition at line 1270 of file vacuum.c.

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

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

Referenced by lazy_check_wraparound_failsafe().

Variable Documentation

parallel_vacuum_worker_delay_ns

int64 parallel_vacuum_worker_delay_ns = 0

Definition at line 93 of file vacuum.c.

Referenced by parallel_vacuum_main(), and vacuum_delay_point().

track_cost_delay_timing

bool track_cost_delay_timing

Definition at line 80 of file vacuum.c.

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

vacuum_cost_delay

double vacuum_cost_delay = 0

Definition at line 89 of file vacuum.c.

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

vacuum_cost_limit

int vacuum_cost_limit = 200

Definition at line 90 of file vacuum.c.

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

vacuum_failsafe_age

int vacuum_failsafe_age

Definition at line 77 of file vacuum.c.

Referenced by vacuum_xid_failsafe_check().

vacuum_freeze_min_age

int vacuum_freeze_min_age

Definition at line 73 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_freeze_table_age

int vacuum_freeze_table_age

Definition at line 74 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_max_eager_freeze_failure_rate

double vacuum_max_eager_freeze_failure_rate

Definition at line 79 of file vacuum.c.

Referenced by default_reloptions(), ExecVacuum(), and table_recheck_autovac().

vacuum_multixact_failsafe_age

int vacuum_multixact_failsafe_age

Definition at line 78 of file vacuum.c.

Referenced by vacuum_xid_failsafe_check().

vacuum_multixact_freeze_min_age

int vacuum_multixact_freeze_min_age

Definition at line 75 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_multixact_freeze_table_age

int vacuum_multixact_freeze_table_age

Definition at line 76 of file vacuum.c.

Referenced by do_autovacuum(), and vacuum_get_cutoffs().

vacuum_truncate

bool vacuum_truncate

Definition at line 81 of file vacuum.c.

Referenced by default_reloptions(), and vacuum_rel().

VacuumActiveNWorkers

pg_atomic_uint32* VacuumActiveNWorkers = NULL

Definition at line 115 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

int VacuumCostBalanceLocal = 0

Definition at line 116 of file vacuum.c.

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

VacuumFailsafeActive

bool VacuumFailsafeActive = false

Definition at line 108 of file vacuum.c.

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

VacuumSharedCostBalance

pg_atomic_uint32* VacuumSharedCostBalance = NULL

Definition at line 114 of file vacuum.c.

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