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Add a function pg_stat_clear_snapshot() that discards any statistics snapshot

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already collected in the current transaction; this allows plpgsql functions to
watch for stats updates even though they are confined to a single transaction.
Use this instead of the previous kluge involving pg_stat_file() to wait for
the stats collector to update in the stats regression test.  Internally,
decouple storage of stats snapshots from transaction boundaries; they'll
now stick around until someone calls pgstat_clear_snapshot --- which xact.c
still does at transaction end, to maintain the previous behavior.  This makes
the logic a lot cleaner, at the price of a couple dozen cycles per transaction
exit.
This commit is contained in:
Tom Lane
2007-02-07 23:11:30 +00:00
parent d9ce68872f
commit aec4cf1c8c
9 changed files with 192 additions and 170 deletions
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5
src/backend/access/transam/xact.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.232 2007/02/01 19:10:25 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.233 2007/02/07 23:11:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1628,6 +1628,7 @@ CommitTransaction(void)
AtEOXact_Namespace(true);
/* smgrcommit already done */
AtEOXact_Files();
pgstat_clear_snapshot();
pgstat_count_xact_commit();
pgstat_report_txn_timestamp(0);
@ -1844,6 +1845,7 @@ PrepareTransaction(void)
AtEOXact_Namespace(true);
/* smgrcommit already done */
AtEOXact_Files();
pgstat_clear_snapshot();
CurrentResourceOwner = NULL;
ResourceOwnerDelete(TopTransactionResourceOwner);
@ -1995,6 +1997,7 @@ AbortTransaction(void)
AtEOXact_Namespace(false);
smgrabort();
AtEOXact_Files();
pgstat_clear_snapshot();
pgstat_count_xact_rollback();
pgstat_report_txn_timestamp(0);