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HOT updates. When we update a tuple without changing any of its indexed

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columns, and the new version can be stored on the same heap page, we no longer
generate extra index entries for the new version.  Instead, index searches
follow the HOT-chain links to ensure they find the correct tuple version.

In addition, this patch introduces the ability to "prune" dead tuples on a
per-page basis, without having to do a complete VACUUM pass to recover space.
VACUUM is still needed to clean up dead index entries, however.

Pavan Deolasee, with help from a bunch of other people.
This commit is contained in:
Tom Lane
2007-09-20 17:56:33 +00:00
parent bbf4fdc253
commit 282d2a03dd
65 changed files with 3517 additions and 514 deletions
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4
src/backend/access/hash/hashinsert.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.46 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.47 2007/09/20 17:56:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -200,7 +200,7 @@ _hash_pgaddtup(Relation rel,
page = BufferGetPage(buf);
itup_off = OffsetNumberNext(PageGetMaxOffsetNumber(page));
if (PageAddItem(page, (Item) itup, itemsize, itup_off, false)
if (PageAddItem(page, (Item) itup, itemsize, itup_off, false, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));

4
src/backend/access/hash/hashovfl.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.59 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.60 2007/09/20 17:56:30 tgl Exp $
*
* NOTES
* Overflow pages look like ordinary relation pages.
@@ -684,7 +684,7 @@ _hash_squeezebucket(Relation rel,
* we have found room so insert on the "write" page.
*/
woffnum = OffsetNumberNext(PageGetMaxOffsetNumber(wpage));
if (PageAddItem(wpage, (Item) itup, itemsz, woffnum, false)
if (PageAddItem(wpage, (Item) itup, itemsz, woffnum, false, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));

4
src/backend/access/hash/hashpage.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.69 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.70 2007/09/20 17:56:30 tgl Exp $
*
* NOTES
* Postgres hash pages look like ordinary relation pages. The opaque
@@ -830,7 +830,7 @@ _hash_splitbucket(Relation rel,
}
noffnum = OffsetNumberNext(PageGetMaxOffsetNumber(npage));
if (PageAddItem(npage, (Item) itup, itemsz, noffnum, false)
if (PageAddItem(npage, (Item) itup, itemsz, noffnum, false, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));