diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-09-20 17:56:33 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-09-20 17:56:33 +0000 |
| commit | 282d2a03dd30804b01f8042f640d638c2ee76604 (patch) | |
| tree | 004f08ce31f1bfb03ab55571ad7867babe5b3d7f /src/include/nodes/relation.h | |
| parent | bbf4fdc2538097bb3103806e1419ceef1f289203 (diff) | |
HOT updates. When we update a tuple without changing any of its indexed
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.
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index ab26491a629..32c699b6de6 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.145 2007/08/31 01:44:06 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.146 2007/09/20 17:56:32 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -71,6 +71,8 @@ typedef struct PlannerGlobal Bitmapset *rewindPlanIDs; /* indices of subplans that require REWIND */ List *finalrtable; /* "flat" rangetable for executor */ + + bool transientPlan; /* redo plan when TransactionXmin changes? */ } PlannerGlobal; /* macro for fetching the Plan associated with a SubPlan node */ |