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Truncate subtrans after each restartpoint.

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Issue reported by Harald Kolb, patch by Fujii Masao, review by me.
This commit is contained in:
Simon Riggs 2010-08-30 14:22:05 +00:00
parent e24d1dc069
commit e72f15ed60
1 changed files with 8 additions and 4 deletions
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12
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.432 2010/08/26 19:23:41 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.433 2010/08/30 14:22:05 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -7706,10 +7706,14 @@ CreateRestartPoint(int flags)
}
/*
* Currently, there is no need to truncate pg_subtrans during recovery. If
* we did do that, we will need to have called StartupSUBTRANS() already
* and then TruncateSUBTRANS() would go here.
* Truncate pg_subtrans if possible. We can throw away all data before
* the oldest XMIN of any running transaction. No future transaction will
* attempt to reference any pg_subtrans entry older than that (see Asserts
* in subtrans.c). When hot standby is disabled, though, we mustn't do
* this because StartupSUBTRANS hasn't been called yet.
*/
if (EnableHotStandby)
TruncateSUBTRANS(GetOldestXmin(true, false));
/* All real work is done, but log before releasing lock. */
if (log_checkpoints)