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RecentXmin is too recent to use as the cutoff point for accessing

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pg_subtrans --- what we need is the oldest xmin of any snapshot in use
in the current top transaction.  Introduce a new variable TransactionXmin
to play this role.  Fixes intermittent regression failure reported by
Neil Conway.
This commit is contained in:
Tom Lane
2004-09-16 18:35:23 +00:00
parent 8f9f198603
commit 86fff990b2
5 changed files with 41 additions and 27 deletions
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3
src/backend/utils/time/tqual.c
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@@ -16,7 +16,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.78 2004/09/13 20:07:36 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.79 2004/09/16 18:35:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -48,6 +48,7 @@ Snapshot LatestSnapshot = NULL;
Snapshot ActiveSnapshot = NULL;
/* These are updated by GetSnapshotData: */
TransactionId TransactionXmin = InvalidTransactionId;
TransactionId RecentXmin = InvalidTransactionId;
TransactionId RecentGlobalXmin = InvalidTransactionId;