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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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14
src/backend/commands/vacuum.c
View File

@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.321 2006/01/18 20:35:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.322 2006/02/11 16:59:09 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -719,7 +719,8 @@ vac_update_relstats(Oid relid, BlockNumber num_pages, double num_tuples,
/* overwrite the existing statistics in the tuple */
pgcform = (Form_pg_class) GETSTRUCT(&rtup);
pgcform->relpages = (int32) num_pages;
pgcform->reltuples = (float4) num_tuples;
if (num_tuples >= 0 )
pgcform->reltuples = (float4) num_tuples;
pgcform->relhasindex = hasindex;
/*
@@ -2961,15 +2962,18 @@ scan_index(Relation indrel, double num_tuples)
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,
stats->num_pages, num_tuples,
false);
ereport(elevel,
(errmsg("index \"%s\" now contains %.0f row versions in %u pages",
RelationGetRelationName(indrel),
stats->num_index_tuples,
num_tuples,
stats->num_pages),
errdetail("%u index pages have been deleted, %u are currently reusable.\n"
"%s.",

11
src/backend/commands/vacuumlazy.c
View File

@@ -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.",