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Performance improvement for MultiRecordFreeSpace on large relations ---

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avoid O(N^2) behavior.  Problem noted and fixed by Stephen Marshall <smarshall@wsicorp.com>,
with some help from Tom Lane.
This commit is contained in:
Tom Lane
2002-09-20 19:56:01 +00:00
parent de96cd5e3a
commit b2735fcd52
5 changed files with 181 additions and 147 deletions
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6
src/backend/storage/smgr/smgr.c
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.60 2002/09/04 20:31:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.61 2002/09/20 19:56:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -410,9 +410,7 @@ smgrtruncate(int16 which, Relation reln, BlockNumber nblocks)
* for the about-to-be-deleted blocks. We want to be sure it
* won't return bogus block numbers later on.
*/
MultiRecordFreeSpace(&reln->rd_node,
nblocks, MaxBlockNumber,
0, NULL, NULL);
MultiRecordFreeSpace(&reln->rd_node, nblocks, 0, NULL);
newblks = (*(smgrsw[which].smgr_truncate)) (reln, nblocks);
if (newblks == InvalidBlockNumber)