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Heikki Linnakangas ba63799598 Don't update relfrozenxid if any pages were skipped. 
Vacuum recognizes that it can update relfrozenxid by checking whether it has
processed all pages of a relation. Unfortunately it performed that check
after truncating the dead pages at the end of the relation, and used the new
number of pages to decide whether all pages have been scanned. If the new
number of pages happened to be smaller or equal to the number of pages
scanned, it incorrectly decided that all pages were scanned.

This can lead to relfrozenxid being updated, even though some pages were
skipped that still contain old XIDs. That can lead to data loss due to xid
wraparounds with some rows suddenly missing. This likely has escaped notice
so far because it takes a large number (~2^31) of xids being used to see the
effect, while a full-table vacuum before that would fix the issue.

The incorrect logic was introduced by commit
b4b6923e03. Backpatch this fix down to 8.4,
like that commit.

Andres Freund, with some modifications by me.
2013-11-27 13:43:18 +02:00
config Don't reject threaded Python on FreeBSD. 2012-02-20 16:21:41 -05:00
contrib Defend against bad trigger definitions in contrib/lo's lo_manage() trigger. 2013-11-23 22:46:15 -05:00
doc Clarify CREATE FUNCTION documentation about handling of typmods. 2013-11-13 13:26:51 -05:00
src Don't update relfrozenxid if any pages were skipped. 2013-11-27 13:43:18 +02:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:06 +02:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Stamp 9.0.14. 2013-10-07 23:12:23 -04:00
configure.in Stamp 9.0.14. 2013-10-07 23:12:23 -04:00
COPYRIGHT Update copyrights for 2013 2013-01-01 17:14:59 -05:00
GNUmakefile.in Back-patch replacement of README.CVS with README.git. 2010-09-21 14:42:58 -04:00
Makefile Add new make targets "world", "install-world" and "installcheck-world" to build, install and check just about everything. 2010-01-28 23:59:52 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.git Fix doc links in README file to work with new website layout 2013-11-12 12:54:43 +01:00

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/.