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Tom Lane 5b562644fe Teach ANALYZE to clear pg_class.relhassubclass when appropriate. 
In the past, relhassubclass always remained true if a relation had ever had
child relations, even if the last subclass was long gone.  While this had
only marginal performance implications in most cases, it was annoying, and
I'm now considering some planner changes that would raise the cost of a
false positive.  It was previously impractical to fix this because of race
condition concerns.  However, given the recent change that made tablecmds.c
take ShareExclusiveLock on relations that are gaining a child (commit
fbcf4b92aa), we can now allow ANALYZE to
clear the flag when it's no longer relevant.  There is no additional
locking cost to do so, since ANALYZE takes ShareExclusiveLock anyway.
2011-09-02 14:29:31 -04:00
config Improve detection of Python 3.2 installations 2011-08-18 14:43:16 +03:00
contrib Remove unnecessary #include references, per pgrminclude script. 2011-09-01 10:04:27 -04:00
doc Userspace access vector cache for contrib/sepgsql. 2011-09-01 08:38:40 -04:00
src Teach ANALYZE to clear pg_class.relhassubclass when appropriate. 2011-09-02 14:29:31 -04:00
.gitignore Add gitignore for mingw/cygwin build outputs 2011-06-09 18:11:47 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Userspace access vector cache for contrib/sepgsql. 2011-09-01 08:38:40 -04:00
configure.in Userspace access vector cache for contrib/sepgsql. 2011-09-01 08:38:40 -04:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Build src/ before contrib/ in make world 2011-08-24 21:34:49 +03:00
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 Trivial typo fix. 2010-09-21 14:16:00 -04:00

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/.