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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/executor/spi.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/executor/spi.c')
| -rw-r--r-- | src/backend/executor/spi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/backend/executor/spi.c b/src/backend/executor/spi.c index af94ad1a3b8..875e4da2914 100644 --- a/src/backend/executor/spi.c +++ b/src/backend/executor/spi.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.180 2007/08/15 19:15:46 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.181 2007/09/20 17:56:31 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1407,6 +1407,7 @@ _SPI_prepare_plan(const char *src, SPIPlanPtr plan) plansource->num_params = nargs; plansource->fully_planned = true; plansource->fixed_result = false; + /* no need to set search_path, generation or saved_xmin */ plansource->resultDesc = PlanCacheComputeResultDesc(stmt_list); plansource->plan = cplan; @@ -1973,6 +1974,7 @@ _SPI_copy_plan(SPIPlanPtr plan, MemoryContext parentcxt) newsource->num_params = newplan->nargs; newsource->fully_planned = plansource->fully_planned; newsource->fixed_result = plansource->fixed_result; + /* no need to worry about seach_path, generation or saved_xmin */ if (plansource->resultDesc) newsource->resultDesc = CreateTupleDescCopy(plansource->resultDesc); newsource->plan = newcplan; |