postgresql

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Tom Lane 52e8fc3e2e Ensure that backends see up-to-date statistics for shared catalogs. Ever since we split the statistics collector's reports into per-database files (commit `187492b6c2`), backends have been seeing stale statistics for shared catalogs. This is because the inquiry message only prompts the collector to write the per-database file for the requesting backend's own database. Stats for shared catalogs are in a separate file for "DB 0", which didn't get updated. In normal operation this was partially masked by the fact that the autovacuum launcher would send an inquiry message at least once per autovacuum_naptime that asked for "DB 0"; so the shared-catalog stats would never be more than a minute out of date. However the problem becomes very obvious with autovacuum disabled, as reported by Peter Eisentraut. To fix, redefine the semantics of inquiry messages so that both the specified DB and DB 0 will be dumped. (This might seem a bit inefficient, but we have no good way to know whether a backend's transaction will look at shared-catalog stats, so we have to read both groups of stats whenever we request stats. Sending two inquiry messages would definitely not be better.) Back-patch to 9.3 where the bug was introduced. Report: <56AD41AC.1030509@gmx.net>		2016-05-25 17:48:15 -04:00
config	Update config.guess and config.sub	2016-05-06 14:02:44 -04:00
contrib	Fix contrib/bloom to work for unlogged indexes.	2016-05-24 21:04:35 -04:00
doc	Update doc text to reflect new column in MVCC phenomena table.	2016-05-25 11:17:08 -05:00
src	Ensure that backends see up-to-date statistics for shared catalogs.	2016-05-25 17:48:15 -04:00
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	2015-04-12 23:53:23 -04:00
.gitattributes	Fix whitespace and remove obsolete gitattributes entry	2016-03-13 16:03:13 -04:00
.gitignore	Add .gitignore entries for AIX-specific intermediate build artifacts.	2015-07-08 20:44:22 -04:00
aclocal.m4	Replace our hacked version of ax_pthread.m4 with latest upstream version.	2015-07-08 20:36:06 +03:00
configure	Stamp 9.6beta1.	2016-05-09 16:47:49 -04:00
configure.in	Stamp 9.6beta1.	2016-05-09 16:47:49 -04:00
COPYRIGHT	Update copyright for 2016	2016-01-02 13:33:40 -05:00
GNUmakefile.in	Fix distclean/maintainer-clean targets to remove top-level tmp_install dir.	2015-05-13 18:48:05 -04:00
HISTORY	Improve text of stub HISTORY file.	2014-02-12 18:16:17 -05:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00

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.  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/.