diff options
| author | Tom Lane | 2007-09-20 17:56:33 +0000 |
|---|---|---|
| committer | Tom Lane | 2007-09-20 17:56:33 +0000 |
| commit | 282d2a03dd30804b01f8042f640d638c2ee76604 (patch) | |
| tree | 004f08ce31f1bfb03ab55571ad7867babe5b3d7f /src/include/optimizer/var.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/optimizer/var.h')
| -rw-r--r-- | src/include/optimizer/var.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/optimizer/var.h b/src/include/optimizer/var.h index 34f8c73f3f6..824ba5a1a4b 100644 --- a/src/include/optimizer/var.h +++ b/src/include/optimizer/var.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/optimizer/var.h,v 1.35 2007/01/05 22:19:56 momjian Exp $ + * $PostgreSQL: pgsql/src/include/optimizer/var.h,v 1.36 2007/09/20 17:56:32 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -18,6 +18,7 @@ extern Relids pull_varnos(Node *node); +extern void pull_varattnos(Node *node, Bitmapset **varattnos); extern bool contain_var_reference(Node *node, int varno, int varattno, int levelsup); extern bool contain_var_clause(Node *node); |