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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/commands/sequence.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/commands/sequence.c')
| -rw-r--r-- | src/backend/commands/sequence.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c index 73024a7e703..25d1e2311b6 100644 --- a/src/backend/commands/sequence.c +++ b/src/backend/commands/sequence.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.145 2007/09/12 22:10:26 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.146 2007/09/20 17:56:31 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1281,7 +1281,7 @@ seq_redo(XLogRecPtr lsn, XLogRecord *record) itemsz = record->xl_len - sizeof(xl_seq_rec); itemsz = MAXALIGN(itemsz); if (PageAddItem(page, (Item) item, itemsz, - FirstOffsetNumber, false) == InvalidOffsetNumber) + FirstOffsetNumber, false, false) == InvalidOffsetNumber) elog(PANIC, "seq_redo: failed to add item to page"); PageSetLSN(page, lsn); |