Add last-vacuum/analyze-time columns to the stats collector, both manual and

issued by autovacuum.  Add accessor functions to them, and use those in the
pg_stat_*_tables system views.

Catalog version bumped due to changes in the pgstat views and the pgstat file.

Patch from Larry Rosenman, minor improvements by me.

src/backend/catalog/system_views.sql

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 1996-2006, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/catalog/system_views.sql,v 1.26 2006/03/05 15:58:23 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/catalog/system_views.sql,v 1.27 2006/05/19 19:08:26 alvherre Exp $
  */
 
 CREATE VIEW pg_roles AS 
@@ -193,6 +193,10 @@ CREATE VIEW pg_stat_all_tables AS
             C.oid AS relid, 
             N.nspname AS schemaname, 
             C.relname AS relname, 
+            pg_stat_get_last_vacuum_time(C.oid) as last_vacuum,
+            pg_stat_get_last_autovacuum_time(C.oid) as last_autovacuum,
+            pg_stat_get_last_analyze_time(C.oid) as last_analyze,
+            pg_stat_get_last_autoanalyze_time(C.oid) as last_autoanalyze,
             pg_stat_get_numscans(C.oid) AS seq_scan, 
             pg_stat_get_tuples_returned(C.oid) AS seq_tup_read, 
             sum(pg_stat_get_numscans(I.indexrelid))::bigint AS idx_scan, 

src/backend/postmaster/pgstat.c

@@ -13,7 +13,7 @@
  *
  *	Copyright (c) 2001-2006, PostgreSQL Global Development Group
  *
- *	$PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.125 2006/05/19 15:15:37 alvherre Exp $
+ *	$PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.126 2006/05/19 19:08:26 alvherre Exp $
  * ----------
  */
 #include "postgres.h"
@@ -739,6 +739,8 @@ pgstat_report_vacuum(Oid tableoid, bool shared,
 	msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
 	msg.m_tableoid = tableoid;
 	msg.m_analyze = analyze;
+	msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
+	msg.m_vacuumtime = GetCurrentTimestamp();
 	msg.m_tuples = tuples;
 	pgstat_send(&msg, sizeof(msg));
 }
@@ -762,6 +764,8 @@ pgstat_report_analyze(Oid tableoid, bool shared, PgStat_Counter livetuples,
 	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
 	msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
 	msg.m_tableoid = tableoid;
+	msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
+	msg.m_analyzetime = GetCurrentTimestamp();
 	msg.m_live_tuples = livetuples;
 	msg.m_dead_tuples = deadtuples;
 	pgstat_send(&msg, sizeof(msg));
@@ -2887,10 +2891,20 @@ pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
 	if (tabentry == NULL)
 		return;
 
+	if (msg->m_autovacuum) 
+		tabentry->autovac_vacuum_timestamp = msg->m_vacuumtime;
+	else 
+		tabentry->vacuum_timestamp = msg->m_vacuumtime; 
 	tabentry->n_live_tuples = msg->m_tuples;
 	tabentry->n_dead_tuples = 0;
 	if (msg->m_analyze)
+	{
 		tabentry->last_anl_tuples = msg->m_tuples;
+		if (msg->m_autovacuum)
+			tabentry->autovac_analyze_timestamp = msg->m_vacuumtime;
+		else
+			tabentry->analyze_timestamp = msg->m_vacuumtime;
+	}
 }
 
 /* ----------
@@ -2919,6 +2933,10 @@ pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
 	if (tabentry == NULL)
 		return;
 
+	if (msg->m_autovacuum) 
+		tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
+	else 
+		tabentry->analyze_timestamp = msg->m_analyzetime;
 	tabentry->n_live_tuples = msg->m_live_tuples;
 	tabentry->n_dead_tuples = msg->m_dead_tuples;
 	tabentry->last_anl_tuples = msg->m_live_tuples + msg->m_dead_tuples;
@@ -3005,6 +3023,10 @@ pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
 			tabentry->n_dead_tuples = tabmsg[i].t_tuples_updated +
 				tabmsg[i].t_tuples_deleted;
 			tabentry->last_anl_tuples = 0;
+			tabentry->vacuum_timestamp = 0;
+			tabentry->autovac_vacuum_timestamp = 0;
+			tabentry->analyze_timestamp = 0;
+			tabentry->autovac_analyze_timestamp = 0;
 
 			tabentry->blocks_fetched = tabmsg[i].t_blocks_fetched;
 			tabentry->blocks_hit = tabmsg[i].t_blocks_hit;

src/backend/utils/adt/pgstatfuncs.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.28 2006/05/19 15:15:37 alvherre Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.29 2006/05/19 19:08:26 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -34,6 +34,10 @@ extern Datum pg_stat_get_tuples_updated(PG_FUNCTION_ARGS);
 extern Datum pg_stat_get_tuples_deleted(PG_FUNCTION_ARGS);
 extern Datum pg_stat_get_blocks_fetched(PG_FUNCTION_ARGS);
 extern Datum pg_stat_get_blocks_hit(PG_FUNCTION_ARGS);
+extern Datum pg_stat_get_last_vacuum_time(PG_FUNCTION_ARGS);
+extern Datum pg_stat_get_last_autovacuum_time(PG_FUNCTION_ARGS);
+extern Datum pg_stat_get_last_analyze_time(PG_FUNCTION_ARGS);
+extern Datum pg_stat_get_last_autoanalyze_time(PG_FUNCTION_ARGS);
 
 extern Datum pg_stat_get_backend_idset(PG_FUNCTION_ARGS);
 extern Datum pg_backend_pid(PG_FUNCTION_ARGS);
@@ -197,6 +201,85 @@ pg_stat_get_blocks_hit(PG_FUNCTION_ARGS)
 	PG_RETURN_INT64(result);
 }
 
+Datum
+pg_stat_get_last_vacuum_time(PG_FUNCTION_ARGS)
+{
+	PgStat_StatTabEntry *tabentry;
+	Oid			relid;
+	TimestampTz	result;
+
+	relid = PG_GETARG_OID(0);
+
+	if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
+		result = 0;
+	else
+		result = tabentry->vacuum_timestamp;
+
+	if (result == 0)
+		PG_RETURN_NULL();
+	else
+		PG_RETURN_TIMESTAMPTZ(result);
+}
+
+Datum
+pg_stat_get_last_autovacuum_time(PG_FUNCTION_ARGS)
+{
+	PgStat_StatTabEntry *tabentry;
+	Oid			relid;
+	TimestampTz	result;
+
+	relid = PG_GETARG_OID(0);
+
+	if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
+		result = 0;
+	else
+		result = tabentry->autovac_vacuum_timestamp;
+
+	if (result == 0)
+		PG_RETURN_NULL();
+	else
+		PG_RETURN_TIMESTAMPTZ(result);
+}
+
+Datum
+pg_stat_get_last_analyze_time(PG_FUNCTION_ARGS)
+{
+	PgStat_StatTabEntry *tabentry;
+	Oid			relid;
+	TimestampTz	result;
+
+	relid = PG_GETARG_OID(0);
+
+	if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
+		result = 0;
+	else
+		result = tabentry->analyze_timestamp;
+
+	if (result == 0)
+		PG_RETURN_NULL();
+	else
+		PG_RETURN_TIMESTAMPTZ(result);
+}
+
+Datum
+pg_stat_get_last_autoanalyze_time(PG_FUNCTION_ARGS)
+{
+	PgStat_StatTabEntry *tabentry;
+	Oid			relid;
+	TimestampTz	result;
+
+	relid = PG_GETARG_OID(0);
+
+	if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
+		result = 0;
+	else
+		result = tabentry->autovac_analyze_timestamp;
+
+	if (result == 0)
+		PG_RETURN_NULL();
+	else
+		PG_RETURN_TIMESTAMPTZ(result);
+}
 
 Datum
 pg_stat_get_backend_idset(PG_FUNCTION_ARGS)