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Allow VACUUM to complete faster by avoiding scanning the indexes when no

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rows were removed from the heap by the VACUUM.

Simon Riggs
This commit is contained in:
Bruce Momjian
2006-02-11 16:59:09 +00:00
parent 85d8ee846b
commit bf324946b3
7 changed files with 65 additions and 29 deletions
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11
src/backend/commands/vacuumlazy.c
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@@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.63 2005/11/22 18:17:09 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.64 2006/02/11 16:59:09 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -639,16 +639,19 @@ lazy_scan_index(Relation indrel, LVRelStats *vacrelstats)
if (!stats)
return;
/* now update statistics in pg_class */
/* now update statistics in pg_class
* we use the number of tuples from the table because we have not
* actually scanned the index, so don't know the number of tuples in index
*/
vac_update_relstats(RelationGetRelid(indrel),
stats->num_pages,
stats->num_index_tuples,
vacrelstats->rel_tuples,
false);
ereport(elevel,
(errmsg("index \"%s\" now contains %.0f row versions in %u pages",
RelationGetRelationName(indrel),
stats->num_index_tuples,
vacrelstats->rel_tuples,
stats->num_pages),
errdetail("%u index pages have been deleted, %u are currently reusable.\n"
"%s.",