*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.38 2007/03/23 21:57:10 alvherre Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.39 2007/03/27 20:36:03 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
/* struct to keep list of candidate databases for vacuum */
typedef struct autovac_dbase
{
- Oid oid;
- char *name;
- TransactionId frozenxid;
- PgStat_StatDBEntry *entry;
+ Oid ad_datid;
+ char *ad_name;
+ TransactionId ad_frozenxid;
+ PgStat_StatDBEntry *ad_entry;
} autovac_dbase;
-/* struct to keep track of tables to vacuum and/or analyze */
+/* struct to keep track of tables to vacuum and/or analyze, after rechecking */
typedef struct autovac_table
{
- Oid relid;
- Oid toastrelid;
- bool dovacuum;
- bool doanalyze;
- int freeze_min_age;
- int vacuum_cost_delay;
- int vacuum_cost_limit;
+ Oid at_relid;
+ Oid at_toastrelid;
+ bool at_dovacuum;
+ bool at_doanalyze;
+ int at_freeze_min_age;
+ int at_vacuum_cost_delay;
+ int at_vacuum_cost_limit;
} autovac_table;
typedef struct
NON_EXEC_STATIC void AutoVacLauncherMain(int argc, char *argv[]);
static void do_start_worker(void);
-static void do_autovacuum(PgStat_StatDBEntry *dbentry);
+static void do_autovacuum(Oid dbid);
static List *autovac_get_database_list(void);
static void test_rel_for_autovac(Oid relid, PgStat_StatTabEntry *tabentry,
Form_pg_class classForm,
static void autovacuum_do_vac_analyze(Oid relid, bool dovacuum,
bool doanalyze, int freeze_min_age);
static HeapTuple get_pg_autovacuum_tuple_relid(Relation avRel, Oid relid);
+static PgStat_StatTabEntry *get_pgstat_tabentry_relid(Oid relid, bool isshared,
+ PgStat_StatDBEntry *shared,
+ PgStat_StatDBEntry *dbentry);
static void autovac_report_activity(VacuumStmt *vacstmt, Oid relid);
static void avl_sighup_handler(SIGNAL_ARGS);
static void avlauncher_shutdown(SIGNAL_ARGS);
autovac_dbase *tmp = lfirst(cell);
/* Find pgstat entry if any */
- tmp->entry = pgstat_fetch_stat_dbentry(tmp->oid);
+ tmp->ad_entry = pgstat_fetch_stat_dbentry(tmp->ad_datid);
/* Check to see if this one is at risk of wraparound */
- if (TransactionIdPrecedes(tmp->frozenxid, xidForceLimit))
+ if (TransactionIdPrecedes(tmp->ad_frozenxid, xidForceLimit))
{
if (db == NULL ||
- TransactionIdPrecedes(tmp->frozenxid, db->frozenxid))
+ TransactionIdPrecedes(tmp->ad_frozenxid, db->ad_frozenxid))
db = tmp;
for_xid_wrap = true;
continue;
* Otherwise, skip a database with no pgstat entry; it means it
* hasn't seen any activity.
*/
- if (!tmp->entry)
+ if (!tmp->ad_entry)
continue;
/*
* both tmp->entry and db->entry must be non-null.)
*/
if (db == NULL ||
- tmp->entry->last_autovac_time < db->entry->last_autovac_time)
+ tmp->ad_entry->last_autovac_time < db->ad_entry->last_autovac_time)
db = tmp;
}
if (db != NULL)
{
LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
- AutoVacuumShmem->process_db = db->oid;
+ AutoVacuumShmem->process_db = db->ad_datid;
LWLockRelease(AutovacuumLock);
SendPostmasterSignal(PMSIGNAL_START_AUTOVAC_WORKER);
if (OidIsValid(dbid))
{
char *dbname;
- PgStat_StatDBEntry *dbentry;
/*
* Report autovac startup to the stats collector. We deliberately do
/* And do an appropriate amount of work */
recentXid = ReadNewTransactionId();
- dbentry = pgstat_fetch_stat_dbentry(dbid);
- do_autovacuum(dbentry);
+ do_autovacuum(dbid);
}
/*
while (read_pg_database_line(db_file, thisname, &db_id,
&db_tablespace, &db_frozenxid))
{
- autovac_dbase *db;
+ autovac_dbase *avdb;
- db = (autovac_dbase *) palloc(sizeof(autovac_dbase));
+ avdb = (autovac_dbase *) palloc(sizeof(autovac_dbase));
- db->oid = db_id;
- db->name = pstrdup(thisname);
- db->frozenxid = db_frozenxid;
+ avdb->ad_datid = db_id;
+ avdb->ad_name = pstrdup(thisname);
+ avdb->ad_frozenxid = db_frozenxid;
/* this gets set later: */
- db->entry = NULL;
+ avdb->ad_entry = NULL;
- dblist = lappend(dblist, db);
+ dblist = lappend(dblist, avdb);
}
FreeFile(db_file);
/*
* Process a database table-by-table
*
- * dbentry is either a pointer to the database entry in the stats databases
- * hash table, or NULL if we couldn't find any entry (the latter case occurs
- * only if we are forcing a vacuum for anti-wrap purposes).
- *
* Note that CHECK_FOR_INTERRUPTS is supposed to be used in certain spots in
* order not to ignore shutdown commands for too long.
*/
static void
-do_autovacuum(PgStat_StatDBEntry *dbentry)
+do_autovacuum(Oid dbid)
{
Relation classRel,
avRel;
List *toast_table_ids = NIL;
ListCell *cell;
PgStat_StatDBEntry *shared;
+ PgStat_StatDBEntry *dbentry;
+
+ /*
+ * may be NULL if we couldn't find an entry (only happens if we
+ * are forcing a vacuum for anti-wrap purposes).
+ */
+ dbentry = pgstat_fetch_stat_dbentry(dbid);
/* Start a transaction so our commands have one to play into. */
StartTransactionCommand();
/* Fetch the pg_autovacuum tuple for the relation, if any */
avTup = get_pg_autovacuum_tuple_relid(avRel, relid);
-
if (HeapTupleIsValid(avTup))
avForm = (Form_pg_autovacuum) GETSTRUCT(avTup);
- if (classForm->relisshared && PointerIsValid(shared))
- tabentry = hash_search(shared->tables, &relid,
- HASH_FIND, NULL);
- else if (PointerIsValid(dbentry))
- tabentry = hash_search(dbentry->tables, &relid,
- HASH_FIND, NULL);
- else
- tabentry = NULL;
+ /* Fetch the pgstat entry for this table */
+ tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
+ shared, dbentry);
test_rel_for_autovac(relid, tabentry, classForm, avForm,
&vacuum_tables, &toast_table_ids);
* Check to see if we need to force vacuuming of this table because
* its toast table needs it.
*/
- if (OidIsValid(tab->toastrelid) && !tab->dovacuum &&
- list_member_oid(toast_table_ids, tab->toastrelid))
+ if (OidIsValid(tab->at_toastrelid) && !tab->at_dovacuum &&
+ list_member_oid(toast_table_ids, tab->at_toastrelid))
{
- tab->dovacuum = true;
+ tab->at_dovacuum = true;
elog(DEBUG2, "autovac: VACUUM %u because of TOAST table",
- tab->relid);
+ tab->at_relid);
}
/* Otherwise, ignore table if it needs no work */
- if (!tab->dovacuum && !tab->doanalyze)
+ if (!tab->at_dovacuum && !tab->at_doanalyze)
continue;
/* Set the vacuum cost parameters for this table */
- VacuumCostDelay = tab->vacuum_cost_delay;
- VacuumCostLimit = tab->vacuum_cost_limit;
+ VacuumCostDelay = tab->at_vacuum_cost_delay;
+ VacuumCostLimit = tab->at_vacuum_cost_limit;
- autovacuum_do_vac_analyze(tab->relid,
- tab->dovacuum,
- tab->doanalyze,
- tab->freeze_min_age);
+ autovacuum_do_vac_analyze(tab->at_relid,
+ tab->at_dovacuum,
+ tab->at_doanalyze,
+ tab->at_freeze_min_age);
}
/*
return avTup;
}
+/*
+ * get_pgstat_tabentry_relid
+ *
+ * Fetch the pgstat entry of a table, either local to a database or shared.
+ */
+static PgStat_StatTabEntry *
+get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared,
+ PgStat_StatDBEntry *dbentry)
+{
+ PgStat_StatTabEntry *tabentry = NULL;
+
+ if (isshared)
+ {
+ if (PointerIsValid(shared))
+ tabentry = hash_search(shared->tables, &relid,
+ HASH_FIND, NULL);
+ }
+ else if (PointerIsValid(dbentry))
+ tabentry = hash_search(dbentry->tables, &relid,
+ HASH_FIND, NULL);
+
+ return tabentry;
+}
+
/*
* test_rel_for_autovac
*
autovac_table *tab;
tab = (autovac_table *) palloc(sizeof(autovac_table));
- tab->relid = relid;
- tab->toastrelid = classForm->reltoastrelid;
- tab->dovacuum = dovacuum;
- tab->doanalyze = doanalyze;
- tab->freeze_min_age = freeze_min_age;
- tab->vacuum_cost_limit = vac_cost_limit;
- tab->vacuum_cost_delay = vac_cost_delay;
+ tab->at_relid = relid;
+ tab->at_toastrelid = classForm->reltoastrelid;
+ tab->at_dovacuum = dovacuum;
+ tab->at_doanalyze = doanalyze;
+ tab->at_freeze_min_age = freeze_min_age;
+ tab->at_vacuum_cost_limit = vac_cost_limit;
+ tab->at_vacuum_cost_delay = vac_cost_delay;
*vacuum_tables = lappend(*vacuum_tables, tab);
}
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