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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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5
src/backend/catalog/index.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.269 2006/07/13 16:49:13 momjian Exp $
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.270 2006/07/30 02:07:18 alvherre Exp $
*
*
* INTERFACE ROUTINES
@@ -1367,7 +1367,8 @@ IndexBuildHeapScan(Relation heapRelation,
else
{
snapshot = SnapshotAny;
OldestXmin = GetOldestXmin(heapRelation->rd_rel->relisshared);
/* okay to ignore lazy VACUUMs here */
OldestXmin = GetOldestXmin(heapRelation->rd_rel->relisshared, true);
}
scan = heap_beginscan(heapRelation, /* relation */