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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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3
src/backend/access/transam/twophase.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.21 2006/07/14 14:52:17 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.22 2006/07/30 02:07:18 alvherre Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -279,6 +279,7 @@ MarkAsPreparing(TransactionId xid, const char *gid,
gxact->proc.pid = 0;
gxact->proc.databaseId = databaseid;
gxact->proc.roleId = owner;
gxact->proc.inVacuum = false;
gxact->proc.lwWaiting = false;
gxact->proc.lwExclusive = false;
gxact->proc.lwWaitLink = NULL;