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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/gist/gist.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.146 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.147 2007/09/20 17:56:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -366,7 +366,7 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
data = (char *) (ptr->list);
for (i = 0; i < ptr->block.num; i++)
{
if (PageAddItem(ptr->page, (Item) data, IndexTupleSize((IndexTuple) data), i + FirstOffsetNumber, false) == InvalidOffsetNumber)
if (PageAddItem(ptr->page, (Item) data, IndexTupleSize((IndexTuple) data), i + FirstOffsetNumber, false, false) == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page in \"%s\"", RelationGetRelationName(state->r));
data += IndexTupleSize((IndexTuple) data);
}

4
src/backend/access/gist/gistutil.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistutil.c,v 1.23 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistutil.c,v 1.24 2007/09/20 17:56:30 tgl Exp $
*-------------------------------------------------------------------------
*/
#include "postgres.h"
@ -42,7 +42,7 @@ gistfillbuffer(Relation r, Page page, IndexTuple *itup,
for (i = 0; i < len; i++)
{
l = PageAddItem(page, (Item) itup[i], IndexTupleSize(itup[i]),
off, false);
off, false, false);
if (l == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page in \"%s\"",
RelationGetRelationName(r));

4
src/backend/access/gist/gistvacuum.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.31 2007/09/12 22:10:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.32 2007/09/20 17:56:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -201,7 +201,7 @@ vacuumSplitPage(GistVacuum *gv, Page tempPage, Buffer buffer, IndexTuple *addon,
data = (char *) (ptr->list);
for (i = 0; i < ptr->block.num; i++)
{
if (PageAddItem(ptr->page, (Item) data, IndexTupleSize((IndexTuple) data), i + FirstOffsetNumber, false) == InvalidOffsetNumber)
if (PageAddItem(ptr->page, (Item) data, IndexTupleSize((IndexTuple) data), i + FirstOffsetNumber, false, false) == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page in \"%s\"", RelationGetRelationName(gv->index));
data += IndexTupleSize((IndexTuple) data);
}