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Take the statistics collector out of the loop for monitoring backends'
current commands; instead, store current-status information in shared memory. This substantially reduces the overhead of stats_command_string and also ensures that pg_stat_activity is fully up to date at all times. Per my recent proposal.
This commit is contained in:
Tom Lane
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.29 2006/05/19 19:08:26 alvherre Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.30 2006/06/19 01:51:21 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -61,11 +61,9 @@ extern Datum pg_stat_get_db_blocks_hit(PG_FUNCTION_ARGS);
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Datum
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pg_stat_get_numscans(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -79,11 +77,9 @@ pg_stat_get_numscans(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_tuples_returned(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -97,11 +93,9 @@ pg_stat_get_tuples_returned(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_tuples_fetched(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -115,11 +109,9 @@ pg_stat_get_tuples_fetched(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_tuples_inserted(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -133,11 +125,9 @@ pg_stat_get_tuples_inserted(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_tuples_updated(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -151,11 +141,9 @@ pg_stat_get_tuples_updated(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_tuples_deleted(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -169,11 +157,9 @@ pg_stat_get_tuples_deleted(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_blocks_fetched(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -187,11 +173,9 @@ pg_stat_get_blocks_fetched(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_blocks_hit(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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int64 result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -204,11 +188,9 @@ pg_stat_get_blocks_hit(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_last_vacuum_time(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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TimestampTz result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -224,11 +206,9 @@ pg_stat_get_last_vacuum_time(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_last_autovacuum_time(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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TimestampTz result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -244,11 +224,9 @@ pg_stat_get_last_autovacuum_time(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_last_analyze_time(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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TimestampTz result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -264,11 +242,9 @@ pg_stat_get_last_analyze_time(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_last_autoanalyze_time(PG_FUNCTION_ARGS)
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{
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PgStat_StatTabEntry *tabentry;
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Oid relid;
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Oid relid = PG_GETARG_OID(0);
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TimestampTz result;
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relid = PG_GETARG_OID(0);
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PgStat_StatTabEntry *tabentry;
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if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
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result = 0;
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@ -342,75 +318,59 @@ pg_stat_reset(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_backend_pid(PG_FUNCTION_ARGS)
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{
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PgStat_StatBeEntry *beentry;
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int32 beid;
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beid = PG_GETARG_INT32(0);
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int32 beid = PG_GETARG_INT32(0);
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PgBackendStatus *beentry;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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PG_RETURN_INT32(beentry->procpid);
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PG_RETURN_INT32(beentry->st_procpid);
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}
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Datum
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pg_stat_get_backend_dbid(PG_FUNCTION_ARGS)
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{
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PgStat_StatBeEntry *beentry;
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int32 beid;
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beid = PG_GETARG_INT32(0);
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int32 beid = PG_GETARG_INT32(0);
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PgBackendStatus *beentry;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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/* Not initialized yet? */
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if (!OidIsValid(beentry->databaseid))
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PG_RETURN_NULL();
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PG_RETURN_OID(beentry->databaseid);
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PG_RETURN_OID(beentry->st_databaseid);
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}
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Datum
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pg_stat_get_backend_userid(PG_FUNCTION_ARGS)
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{
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PgStat_StatBeEntry *beentry;
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int32 beid;
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beid = PG_GETARG_INT32(0);
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int32 beid = PG_GETARG_INT32(0);
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PgBackendStatus *beentry;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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/* Not initialized yet? */
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if (!OidIsValid(beentry->userid))
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PG_RETURN_NULL();
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PG_RETURN_OID(beentry->userid);
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PG_RETURN_OID(beentry->st_userid);
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}
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Datum
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pg_stat_get_backend_activity(PG_FUNCTION_ARGS)
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{
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PgStat_StatBeEntry *beentry;
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int32 beid;
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int len;
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char *activity;
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int32 beid = PG_GETARG_INT32(0);
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text *result;
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beid = PG_GETARG_INT32(0);
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PgBackendStatus *beentry;
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int len;
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const char *activity;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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activity = "<backend information not available>";
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else if (!superuser() && beentry->userid != GetUserId())
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else if (!superuser() && beentry->st_userid != GetUserId())
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activity = "<insufficient privilege>";
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else if (*(beentry->activity) == '\0')
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else if (*(beentry->st_activity) == '\0')
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activity = "<command string not enabled>";
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else
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activity = beentry->activity;
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activity = beentry->st_activity;
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len = strlen(activity);
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result = palloc(VARHDRSZ + len);
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@ -426,15 +386,15 @@ pg_stat_get_backend_activity_start(PG_FUNCTION_ARGS)
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{
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int32 beid = PG_GETARG_INT32(0);
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TimestampTz result;
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PgStat_StatBeEntry *beentry;
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PgBackendStatus *beentry;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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if (!superuser() && beentry->userid != GetUserId())
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if (!superuser() && beentry->st_userid != GetUserId())
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PG_RETURN_NULL();
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result = beentry->activity_start_timestamp;
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result = beentry->st_activity_start_timestamp;
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/*
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* No time recorded for start of current query -- this is the case if the
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@ -451,15 +411,15 @@ pg_stat_get_backend_start(PG_FUNCTION_ARGS)
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{
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int32 beid = PG_GETARG_INT32(0);
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TimestampTz result;
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PgStat_StatBeEntry *beentry;
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PgBackendStatus *beentry;
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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if (!superuser() && beentry->userid != GetUserId())
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if (!superuser() && beentry->st_userid != GetUserId())
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PG_RETURN_NULL();
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result = beentry->start_timestamp;
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result = beentry->st_proc_start_timestamp;
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if (result == 0) /* probably can't happen? */
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PG_RETURN_NULL();
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@ -471,31 +431,25 @@ pg_stat_get_backend_start(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_backend_client_addr(PG_FUNCTION_ARGS)
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{
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PgStat_StatBeEntry *beentry;
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int32 beid = PG_GETARG_INT32(0);
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PgBackendStatus *beentry;
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SockAddr zero_clientaddr;
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int32 beid;
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char remote_host[NI_MAXHOST];
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int ret;
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beid = PG_GETARG_INT32(0);
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
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PG_RETURN_NULL();
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/* Not initialized yet? */
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if (!OidIsValid(beentry->userid))
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PG_RETURN_NULL();
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if (!superuser() && beentry->userid != GetUserId())
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if (!superuser() && beentry->st_userid != GetUserId())
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PG_RETURN_NULL();
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/* A zeroed client addr means we don't know */
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memset(&zero_clientaddr, 0, sizeof(zero_clientaddr));
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if (memcmp(&(beentry->clientaddr), &zero_clientaddr,
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if (memcmp(&(beentry->st_clientaddr), &zero_clientaddr,
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sizeof(zero_clientaddr) == 0))
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PG_RETURN_NULL();
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switch (beentry->clientaddr.addr.ss_family)
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switch (beentry->st_clientaddr.addr.ss_family)
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{
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case AF_INET:
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#ifdef HAVE_IPV6
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@ -507,7 +461,8 @@ pg_stat_get_backend_client_addr(PG_FUNCTION_ARGS)
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}
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remote_host[0] = '\0';
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ret = pg_getnameinfo_all(&beentry->clientaddr.addr, beentry->clientaddr.salen,
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ret = pg_getnameinfo_all(&beentry->st_clientaddr.addr,
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beentry->st_clientaddr.salen,
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remote_host, sizeof(remote_host),
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NULL, 0,
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NI_NUMERICHOST | NI_NUMERICSERV);
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@ -521,31 +476,25 @@ pg_stat_get_backend_client_addr(PG_FUNCTION_ARGS)
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Datum
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pg_stat_get_backend_client_port(PG_FUNCTION_ARGS)
|
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{
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PgStat_StatBeEntry *beentry;
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int32 beid = PG_GETARG_INT32(0);
|
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PgBackendStatus *beentry;
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SockAddr zero_clientaddr;
|
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int32 beid;
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char remote_port[NI_MAXSERV];
|
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int ret;
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beid = PG_GETARG_INT32(0);
|
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|
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if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
|
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PG_RETURN_NULL();
|
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|
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/* Not initialized yet? */
|
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if (!OidIsValid(beentry->userid))
|
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PG_RETURN_NULL();
|
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|
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if (!superuser() && beentry->userid != GetUserId())
|
||||
if (!superuser() && beentry->st_userid != GetUserId())
|
||||
PG_RETURN_NULL();
|
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|
||||
/* A zeroed client addr means we don't know */
|
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memset(&zero_clientaddr, 0, sizeof(zero_clientaddr));
|
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if (memcmp(&(beentry->clientaddr), &zero_clientaddr,
|
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if (memcmp(&(beentry->st_clientaddr), &zero_clientaddr,
|
||||
sizeof(zero_clientaddr) == 0))
|
||||
PG_RETURN_NULL();
|
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switch (beentry->clientaddr.addr.ss_family)
|
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switch (beentry->st_clientaddr.addr.ss_family)
|
||||
{
|
||||
case AF_INET:
|
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#ifdef HAVE_IPV6
|
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@ -559,31 +508,35 @@ pg_stat_get_backend_client_port(PG_FUNCTION_ARGS)
|
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}
|
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remote_port[0] = '\0';
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ret = pg_getnameinfo_all(&beentry->clientaddr.addr,
|
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beentry->clientaddr.salen,
|
||||
ret = pg_getnameinfo_all(&beentry->st_clientaddr.addr,
|
||||
beentry->st_clientaddr.salen,
|
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NULL, 0,
|
||||
remote_port, sizeof(remote_port),
|
||||
NI_NUMERICHOST | NI_NUMERICSERV);
|
||||
if (ret)
|
||||
PG_RETURN_NULL();
|
||||
|
||||
PG_RETURN_DATUM(DirectFunctionCall1(int4in, CStringGetDatum(remote_port)));
|
||||
PG_RETURN_DATUM(DirectFunctionCall1(int4in,
|
||||
CStringGetDatum(remote_port)));
|
||||
}
|
||||
|
||||
|
||||
Datum
|
||||
pg_stat_get_db_numbackends(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
Oid dbid;
|
||||
Oid dbid = PG_GETARG_OID(0);
|
||||
int32 result;
|
||||
int tot_backends = pgstat_fetch_stat_numbackends();
|
||||
int beid;
|
||||
|
||||
dbid = PG_GETARG_OID(0);
|
||||
result = 0;
|
||||
for (beid = 1; beid <= tot_backends; beid++)
|
||||
{
|
||||
PgBackendStatus *beentry = pgstat_fetch_stat_beentry(beid);
|
||||
|
||||
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
|
||||
result = 0;
|
||||
else
|
||||
result = (int32) (dbentry->n_backends);
|
||||
if (beentry && beentry->st_databaseid == dbid)
|
||||
result++;
|
||||
}
|
||||
|
||||
PG_RETURN_INT32(result);
|
||||
}
|
||||
@ -592,11 +545,9 @@ pg_stat_get_db_numbackends(PG_FUNCTION_ARGS)
|
||||
Datum
|
||||
pg_stat_get_db_xact_commit(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
Oid dbid;
|
||||
Oid dbid = PG_GETARG_OID(0);
|
||||
int64 result;
|
||||
|
||||
dbid = PG_GETARG_OID(0);
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
|
||||
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
|
||||
result = 0;
|
||||
@ -610,11 +561,9 @@ pg_stat_get_db_xact_commit(PG_FUNCTION_ARGS)
|
||||
Datum
|
||||
pg_stat_get_db_xact_rollback(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
Oid dbid;
|
||||
Oid dbid = PG_GETARG_OID(0);
|
||||
int64 result;
|
||||
|
||||
dbid = PG_GETARG_OID(0);
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
|
||||
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
|
||||
result = 0;
|
||||
@ -628,11 +577,9 @@ pg_stat_get_db_xact_rollback(PG_FUNCTION_ARGS)
|
||||
Datum
|
||||
pg_stat_get_db_blocks_fetched(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
Oid dbid;
|
||||
Oid dbid = PG_GETARG_OID(0);
|
||||
int64 result;
|
||||
|
||||
dbid = PG_GETARG_OID(0);
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
|
||||
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
|
||||
result = 0;
|
||||
@ -646,11 +593,9 @@ pg_stat_get_db_blocks_fetched(PG_FUNCTION_ARGS)
|
||||
Datum
|
||||
pg_stat_get_db_blocks_hit(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
Oid dbid;
|
||||
Oid dbid = PG_GETARG_OID(0);
|
||||
int64 result;
|
||||
|
||||
dbid = PG_GETARG_OID(0);
|
||||
PgStat_StatDBEntry *dbentry;
|
||||
|
||||
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
|
||||
result = 0;
|
||||
|
||||
Reference in New Issue
Block a user