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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/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.221 2007/05/26 18:23:01 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.222 2007/09/20 17:56:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -134,6 +134,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
glob->subrtables = NIL;
glob->rewindPlanIDs = NULL;
glob->finalrtable = NIL;
glob->transientPlan = false;
/* Determine what fraction of the plan is likely to be scanned */
if (cursorOptions & CURSOR_OPT_FAST_PLAN)
@ -183,6 +184,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
result->commandType = parse->commandType;
result->canSetTag = parse->canSetTag;
result->transientPlan = glob->transientPlan;
result->planTree = top_plan;
result->rtable = glob->finalrtable;
result->resultRelations = root->resultRelations;