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Tom Lane 21b446dd09 Fix CLUSTER/VACUUM FULL for toast values owned by recently-updated rows. In commit `7b0d0e9356`, I made CLUSTER and VACUUM FULL try to preserve toast value OIDs from the original toast table to the new one. However, if we have to copy both live and recently-dead versions of a row that has a toasted column, those versions may well reference the same toast value with the same OID. The patch then led to duplicate-key failures as we tried to insert the toast value twice with the same OID. (The previous behavior was not very desirable either, since it would have silently inserted the same value twice with different OIDs. That wastes space, but what's worse is that the toast values inserted for already-dead heap rows would not be reclaimed by subsequent ordinary VACUUMs, since they go into the new toast table marked live not deleted.) To fix, check if the copied OID already exists in the new toast table, and if so, assume that it stores the desired value. This is reasonably safe since the only case where we will copy an OID from a previous toast pointer is when toast_insert_or_update was given that toast pointer and so we just pulled the data from the old table; if we got two different values that way then we have big problems anyway. We do have to assume that no other backend is inserting items into the new toast table concurrently, but that's surely safe for CLUSTER and VACUUM FULL. Per bug #6393 from Maxim Boguk. Back-patch to 9.0, same as the previous patch.		2012-01-12 16:40:14 -05:00
config	Enable compiling with the mingw-w64 32 bit compiler.	2011-12-10 15:35:41 -05:00
contrib	Fix one-byte buffer overrun in contrib/test_parser.	2012-01-09 19:56:27 -05:00
doc	Support CREATE TABLE (LIKE ...) with foreign tables and views	2012-01-10 21:46:29 +02:00
src	Fix CLUSTER/VACUUM FULL for toast values owned by recently-updated rows.	2012-01-12 16:40:14 -05:00
.gitignore	Add gitignore for mingw/cygwin build outputs	2011-06-09 18:11:47 +02:00
aclocal.m4	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
configure	Use __sync_lock_test_and_set() for spinlocks on ARM, if available.	2012-01-07 15:38:52 -05:00
configure.in	Use __sync_lock_test_and_set() for spinlocks on ARM, if available.	2012-01-07 15:38:52 -05:00
COPYRIGHT	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
GNUmakefile.in	Build src/ before contrib/ in make world	2011-08-24 21:34:49 +03:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Remove useless whitespace at end of lines	2010-11-23 22:34:55 +02:00
README.git	Trivial typo fix.	2010-09-21 14:16:00 -04:00

README

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.