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142530ef0e
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Heikki Linnakangas 142530ef0e Fix WAL-logging of FSM and VM truncation. 
When a relation is truncated, it is important that the FSM is truncated as
well. Otherwise, after recovery, the FSM can return a page that has been
truncated away, leading to errors like:

ERROR:  could not read block 28991 in file "base/16390/572026": read only 0
of 8192 bytes

We were using MarkBufferDirtyHint() to dirty the buffer holding the last
remaining page of the FSM, but during recovery, that might in fact not
dirty the page, and the FSM update might be lost.

To fix, use the stronger MarkBufferDirty() function. MarkBufferDirty()
requires us to do WAL-logging ourselves, to protect from a torn page, if
checksumming is enabled.

Also fix an oversight in visibilitymap_truncate: it also needs to WAL-log
when checksumming is enabled.

Analysis by Pavan Deolasee.

Discussion: <CABOikdNr5vKucqyZH9s1Mh0XebLs_jRhKv6eJfNnD2wxTn=_9A@mail.gmail.com>

Backpatch to 9.3, where we got data checksums.
2016-10-19 14:43:34 +03:00
config Update config.guess and config.sub 2016-05-06 14:02:44 -04:00
contrib Correct logical decoding restore behaviour for subtransactions. 2016-10-03 22:12:31 -07:00
doc Remove spurious word. 2016-10-15 06:49:00 +09:00
src Fix WAL-logging of FSM and VM truncation. 2016-10-19 14:43:34 +03:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes
.gitignore
aclocal.m4
configure Stamp 9.6.0. 2016-09-26 16:26:58 -04:00
configure.in Stamp 9.6.0. 2016-09-26 16:26:58 -04:00
COPYRIGHT Update copyright for 2016 2016-01-02 13:33:40 -05:00
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README
README.git

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.  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/.