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Track last time for statistics reset on databases and bgwriter

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Tracks one counter for each database, which is reset whenever
the statistics for any individual object inside the database is
reset, and one counter for the background writer.

Tomas Vondra, reviewed by Greg Smith
This commit is contained in:
Magnus Hagander
2011-02-10 15:09:35 +01:00
parent a2e61ec319
commit 4c468b37a2
8 changed files with 79 additions and 9 deletions
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26
src/backend/utils/adt/pgstatfuncs.c
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@ -77,12 +77,14 @@ extern Datum pg_stat_get_db_conflict_snapshot(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_conflict_bufferpin(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_conflict_startup_deadlock(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_conflict_all(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_stat_reset_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_timed_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_requested_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_clean(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_written_backend(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_fsync_backend(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_alloc(PG_FUNCTION_ARGS);
@ -1135,6 +1137,24 @@ pg_stat_get_db_tuples_deleted(PG_FUNCTION_ARGS)
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_db_stat_reset_time(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
TimestampTz result;
PgStat_StatDBEntry *dbentry;
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
result = dbentry->stat_reset_timestamp;
if (result == 0)
PG_RETURN_NULL();
else
PG_RETURN_TIMESTAMPTZ(result);
}
Datum
pg_stat_get_db_conflict_tablespace(PG_FUNCTION_ARGS)
{
@ -1260,6 +1280,12 @@ pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS)
PG_RETURN_INT64(pgstat_fetch_global()->maxwritten_clean);
}
Datum
pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS)
{
PG_RETURN_TIMESTAMPTZ(pgstat_fetch_global()->stat_reset_timestamp);
}
Datum
pg_stat_get_buf_written_backend(PG_FUNCTION_ARGS)
{