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Tom Lane 4b6106ccfe Prevent incorrect updates of pg_index while reindexing pg_index itself. 
The places that attempt to change pg_index.indcheckxmin during a reindexing
operation cannot be executed safely if pg_index itself is the subject of
the operation.  This is the explanation for a couple of recent reports of
VACUUM FULL failing with
	ERROR:  duplicate key value violates unique constraint "pg_index_indexrelid_index"
	DETAIL:  Key (indexrelid)=(2678) already exists.

However, there isn't any real need to update indcheckxmin in such a
situation, if we assume that pg_index can never contain a truly broken HOT
chain.  This assumption holds if new indexes are never created on it during
concurrent operations, which is something we don't consider safe for any
system catalog, not just pg_index.  Accordingly, modify the code to not
manipulate indcheckxmin when reindexing any system catalog.

Back-patch to 8.3, where HOT was introduced.  The known failure scenarios
involve 9.0-style VACUUM FULL, so there might not be any real risk before
9.0, but let's not assume that.
2011-04-15 20:18:57 -04:00
config Better support for thread-support flag detection with clang 2011-02-16 23:15:54 +02:00
contrib Rename pg_regress option --multibyte to --encoding 2011-04-15 08:42:05 +03:00
doc Note that Bison on GnuWin32 has trouble with paths with spaces 2011-04-15 15:30:21 +02:00
src Prevent incorrect updates of pg_index while reindexing pg_index itself. 2011-04-15 20:18:57 -04:00
.gitignore Ignore files built by coverage builds 2011-03-08 22:10:00 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
configure.in Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Add maintainer-check target 2011-03-28 22:56:52 +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/.