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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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10
src/backend/executor/execUtils.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.150 2007/08/15 21:39:50 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.151 2007/09/20 17:56:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -981,6 +981,10 @@ ExecCloseIndices(ResultRelInfo *resultRelInfo)
* stuff as it only exists here because the genam stuff
* doesn't provide the functionality needed by the
* executor.. -cim 9/27/89
*
* CAUTION: this must not be called for a HOT update.
* We can't defend against that here for lack of info.
* Should we change the API to make it safer?
* ----------------------------------------------------------------
*/
void
@ -1029,6 +1033,10 @@ ExecInsertIndexTuples(TupleTableSlot *slot,
indexInfo = indexInfoArray[i];
/* If the index is marked as read-only, ignore it */
if (!indexInfo->ii_ReadyForInserts)
continue;
/* Check for partial index */
if (indexInfo->ii_Predicate != NIL)
{