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Add a txn_start column to pg_stat_activity. This makes it easier to

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identify long-running transactions. Since we already need to record
the transaction-start time (e.g. for now()), we don't need any
additional system calls to report this information.

Catversion bumped, initdb required.
This commit is contained in:
Neil Conway
2006-12-06 18:06:48 +00:00
parent dd740e1fd0
commit 886a02d1cb
9 changed files with 77 additions and 21 deletions
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26
src/backend/utils/adt/pgstatfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.34 2006/10/04 00:29:59 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.35 2006/12/06 18:06:47 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -44,6 +44,7 @@ extern Datum pg_stat_get_backend_userid(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_activity(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_waiting(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_activity_start(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_txn_start(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_start(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_client_addr(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_backend_client_port(PG_FUNCTION_ARGS);
@ -422,6 +423,29 @@ pg_stat_get_backend_activity_start(PG_FUNCTION_ARGS)
PG_RETURN_TIMESTAMPTZ(result);
}
Datum
pg_stat_get_backend_txn_start(PG_FUNCTION_ARGS)
{
int32 beid = PG_GETARG_INT32(0);
TimestampTz result;
PgBackendStatus *beentry;
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
PG_RETURN_NULL();
result = beentry->st_txn_start_timestamp;
if (result == 0) /* not in a transaction */
PG_RETURN_NULL();
PG_RETURN_TIMESTAMPTZ(result);
}
Datum
pg_stat_get_backend_start(PG_FUNCTION_ARGS)
{