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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/storage/lmgr/proc.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.178 2006/07/23 23:08:46 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.179 2006/07/30 02:07:18 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -257,6 +257,7 @@ InitProcess(void)
/* databaseId and roleId will be filled in later */
MyProc->databaseId = InvalidOid;
MyProc->roleId = InvalidOid;
MyProc->inVacuum = false;
MyProc->lwWaiting = false;
MyProc->lwExclusive = false;
MyProc->lwWaitLink = NULL;
@@ -388,6 +389,7 @@ InitDummyProcess(void)
MyProc->xmin = InvalidTransactionId;
MyProc->databaseId = InvalidOid;
MyProc->roleId = InvalidOid;
MyProc->inVacuum = false;
MyProc->lwWaiting = false;
MyProc->lwExclusive = false;
MyProc->lwWaitLink = NULL;