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Modify snapshot definition so that lazy vacuums are ignored by other

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vacuums.  This allows a OLTP-like system with big tables to continue
regular vacuuming on small-but-frequently-updated tables while the
big tables are being vacuumed.

Original patch from Hannu Krossing, rewritten by Tom Lane and updated
by me.
This commit is contained in:
Alvaro Herrera
2006-07-30 02:07:18 +00:00
parent d6603791ea
commit 92c2ecc130
9 changed files with 99 additions and 28 deletions
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4
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.244 2006/07/14 14:52:17 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.245 2006/07/30 02:07:18 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -5413,7 +5413,7 @@ CreateCheckPoint(bool shutdown, bool force)
* StartupSUBTRANS hasn't been called yet.
*/
if (!InRecovery)
TruncateSUBTRANS(GetOldestXmin(true));
TruncateSUBTRANS(GetOldestXmin(true, false));
if (!shutdown)
ereport(DEBUG2,