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Add pg_stat_get_snapshot_timestamp() to show statistics snapshot timestamp.

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Per discussion, this could be useful for purposes such as programmatically
detecting a nonresponding stats collector.  We already have the timestamp
anyway, it's just a matter of providing a SQL-accessible function to fetch
it.

Matt Kelly, reviewed by Jim Nasby
This commit is contained in:
Tom Lane
2015-02-19 21:36:50 -05:00
parent 634618ecd0
commit 2fb7a75f37
6 changed files with 33 additions and 3 deletions
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8
src/backend/utils/adt/pgstatfuncs.c
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@ -115,6 +115,7 @@ extern Datum pg_stat_get_xact_function_calls(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_xact_function_total_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_xact_function_self_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_snapshot_timestamp(PG_FUNCTION_ARGS);
extern Datum pg_stat_clear_snapshot(PG_FUNCTION_ARGS);
extern Datum pg_stat_reset(PG_FUNCTION_ARGS);
extern Datum pg_stat_reset_shared(PG_FUNCTION_ARGS);
@ -1682,6 +1683,13 @@ pg_stat_get_xact_function_self_time(PG_FUNCTION_ARGS)
}
/* Get the timestamp of the current statistics snapshot */
Datum
pg_stat_get_snapshot_timestamp(PG_FUNCTION_ARGS)
{
PG_RETURN_TIMESTAMPTZ(pgstat_fetch_global()->stats_timestamp);
}
/* Discard the active statistics snapshot */
Datum
pg_stat_clear_snapshot(PG_FUNCTION_ARGS)