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Robert Haas b4d4ce1d50 Increase threshold for multixact member emergency autovac to 50%. Analysis by Noah Misch shows that the 25% threshold set by commit `53bb309d2d` is lower than any other, similar autovac threshold. While we don't know exactly what value will be optimal for all users, it is better to err a little on the high side than on the low side. A higher value increases the risk that users might exhaust the available space and start seeing errors before autovacuum can clean things up sufficiently, but a user who hits that problem can compensate for it by reducing autovacuum_multixact_freeze_max_age to a value dependent on their average multixact size. On the flip side, if the emergency cap imposed by that patch kicks in too early, the user will experience excessive wraparound scanning and will be unable to mitigate that problem by configuration. The new value will hopefully reduce the risk of such bad experiences while still providing enough headroom to avoid multixact member exhaustion for most users. Along the way, adjust the documentation to reflect the effects of commit `04e6d3b877`, which taught autovacuum to run for multixact wraparound even when autovacuum is configured off.		2015-05-11 12:15:50 -04:00
config	fix escaping of brackets for m4 broken in `b6b2149e48`	2015-05-03 09:37:15 -04:00
contrib	Code review for foreign/custom join pushdown patch.	2015-05-10 14:36:36 -04:00
doc	Increase threshold for multixact member emergency autovac to 50%.	2015-05-11 12:15:50 -04:00
src	Increase threshold for multixact member emergency autovac to 50%.	2015-05-11 12:15:50 -04:00
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	2015-04-12 23:53:23 -04:00
.gitattributes	Add functions for dealing with PGP armor header lines to pgcrypto.	2014-10-01 16:03:39 +03:00
.gitignore	Improve speed of make check-world	2015-04-23 08:59:52 -04:00
aclocal.m4	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
configure	fix escaping of brackets for m4 broken in `b6b2149e48`	2015-05-03 09:37:15 -04:00
configure.in	Windows also needs an override of the shared libpython detection	2015-05-02 13:23:16 -04:00
COPYRIGHT	Update copyright for 2015	2015-01-06 11:43:47 -05:00
GNUmakefile.in	Fix parallel make risk with new check temp-install setup	2015-04-29 20:34:22 -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/.