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| 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/backend/nodes/tidbitmap.c | |
| parent | bbf4fdc2538097bb3103806e1419ceef1f289203 (diff) | |
| download | postgresql-282d2a03dd30804b01f8042f640d638c2ee76604.tar.gz postgresql-282d2a03dd30804b01f8042f640d638c2ee76604.zip | |
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/backend/nodes/tidbitmap.c')
| -rw-r--r-- | src/backend/nodes/tidbitmap.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/src/backend/nodes/tidbitmap.c b/src/backend/nodes/tidbitmap.c index 2f3e00d6a26..53e35b01acc 100644 --- a/src/backend/nodes/tidbitmap.c +++ b/src/backend/nodes/tidbitmap.c @@ -23,7 +23,7 @@ * Copyright (c) 2003-2007, PostgreSQL Global Development Group * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/nodes/tidbitmap.c,v 1.12 2007/04/26 23:24:44 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/nodes/tidbitmap.c,v 1.13 2007/09/20 17:56:31 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -32,6 +32,7 @@ #include <limits.h> #include "access/htup.h" +#include "nodes/bitmapset.h" #include "nodes/tidbitmap.h" #include "storage/bufpage.h" #include "utils/hsearch.h" @@ -61,9 +62,7 @@ */ #define PAGES_PER_CHUNK (BLCKSZ / 32) -/* The bitmap unit size can be adjusted by changing these declarations: */ -#define BITS_PER_BITMAPWORD 32 -typedef uint32 bitmapword; /* must be an unsigned type */ +/* We use BITS_PER_BITMAPWORD and typedef bitmapword from nodes/bitmapset.h */ #define WORDNUM(x) ((x) / BITS_PER_BITMAPWORD) #define BITNUM(x) ((x) % BITS_PER_BITMAPWORD) |