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Tom Lane ac8bc3b6e4 Remove unnecessary relcache flushes after changing btree metapages. These flushes were added in my commit `d2896a9ed`, which added the btree logic that keeps a cached copy of the index metapage data in index relcache entries. The idea was to ensure that other backends would promptly update their cached copies after a change. However, this is not really necessary, since _bt_getroot() has adequate defenses against believing a stale root page link, and _bt_getrootheight() doesn't have to be 100% right. Moreover, if it were necessary, a relcache flush would be an unreliable way to do it, since the sinval mechanism believes that relcache flush requests represent transactional updates, and therefore discards them on transaction rollback. Therefore, we might as well drop these flush requests and save the time to rebuild the whole relcache entry after a metapage change. If we ever try to support in-place truncation of btree indexes, it might be necessary to revisit this issue so that _bt_getroot() can't get caught by trying to follow a metapage link to a page that no longer exists. A possible solution to that is to make use of an smgr, rather than relcache, inval request to force other backends to discard their cached metapages. But for the moment this is not worth pursuing.		2014-02-05 13:43:46 -05:00
config	Allow use of "z" flag in our printf calls, and use it where appropriate.	2014-01-23 17:18:33 -05:00
contrib	Improve connection-failure error handling in contrib/postgres_fdw.	2014-02-03 21:30:20 -05:00
doc	Minor improvements to replication slot documentation.	2014-02-05 13:41:25 -05:00
src	Remove unnecessary relcache flushes after changing btree metapages.	2014-02-05 13:43:46 -05:00
.dir-locals.el	Update Emacs configuration	2013-08-13 20:08:44 -04:00
.gitattributes	gitattributes: Make syntax compatible with older Git versions	2013-11-12 21:58:46 -05:00
.gitignore	Add *.pot to .gitignore	2013-10-19 10:56:52 -04:00
COPYRIGHT	Update copyright for 2014	2014-01-07 16:05:30 -05:00
GNUmakefile.in	Add new make targets check-tests and installcheck-tests.	2014-01-28 18:10:00 -05:00
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	Fix doc links in README file to work with new website layout	2013-11-12 12:53:32 +01:00
aclocal.m4	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
configure	Allow use of "z" flag in our printf calls, and use it where appropriate.	2014-01-23 17:18:33 -05:00
configure.in	Allow use of "z" flag in our printf calls, and use it where appropriate.	2014-01-23 17:18:33 -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.  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/.