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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2012-11-26 15:55:43 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2012-11-26 15:55:43 -0500 |
| commit | 532994299e2ff208a58376134fab75f5ae471e41 (patch) | |
| tree | 640a22d6172d9dbdccf88ecc1195c6a23a3b0a8c /doc/src | |
| parent | d3237e04ca380d6c08f6133fde97a9d956e3161a (diff) | |
| download | postgresql-532994299e2ff208a58376134fab75f5ae471e41.tar.gz postgresql-532994299e2ff208a58376134fab75f5ae471e41.zip | |
Revert patch for taking fewer snapshots.
This reverts commit d573e239f03506920938bf0be56c868d9c3416da, "Take fewer
snapshots". While that seemed like a good idea at the time, it caused
execution to use a snapshot that had been acquired before locking any of
the tables mentioned in the query. This created user-visible anomalies
that were not present in any prior release of Postgres, as reported by
Tomas Vondra. While this whole area could do with a redesign (since there
are related cases that have anomalies anyway), it doesn't seem likely that
any future patch would be reasonably back-patchable; and we don't want 9.2
to exhibit a behavior that's subtly unlike either past or future releases.
Hence, revert to prior code while we rethink the problem.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/release-9.2.sgml | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/doc/src/sgml/release-9.2.sgml b/doc/src/sgml/release-9.2.sgml index 840e7a7a0d9..c641606fd52 100644 --- a/doc/src/sgml/release-9.2.sgml +++ b/doc/src/sgml/release-9.2.sgml @@ -811,13 +811,6 @@ <listitem> <para> - Take fewer <acronym>MVCC</acronym> snapshots - (Robert Haas) - </para> - </listitem> - - <listitem> - <para> Make the number of CLOG buffers scale based on <link linkend="guc-shared-buffers"><varname>shared_buffers</></link> (Robert Haas, Simon Riggs, Tom Lane) |