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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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18
src/backend/access/hash/hash.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.83 2006/01/25 23:26:11 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.84 2006/02/11 16:59:09 momjian Exp $
*
* NOTES
* This file contains only the public interface routines.
@@ -496,6 +496,17 @@ hashbulkdelete(PG_FUNCTION_ARGS)
tuples_removed = 0;
num_index_tuples = 0;
/* return statistics */
num_pages = RelationGetNumberOfBlocks(rel);
result = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
result->num_pages = num_pages;
if (!callback_state)
{
PG_RETURN_POINTER(result);
}
/*
* Read the metapage to fetch original bucket and tuple counts. Also, we
* keep a copy of the last-seen metapage so that we can use its
@@ -644,11 +655,6 @@ loop_top:
_hash_wrtbuf(rel, metabuf);
/* return statistics */
num_pages = RelationGetNumberOfBlocks(rel);
result = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
result->num_pages = num_pages;
result->num_index_tuples = num_index_tuples;
result->tuples_removed = tuples_removed;