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Tom Lane 3969f2924b Revise GEQO planner to make use of some heuristic knowledge about SQL, namely 
that it's good to join where there are join clauses rather than where there
are not.  Also enable it to generate bushy plans at need, so that it doesn't
fail in the presence of multiple IN clauses containing sub-joins.  These
changes appear to improve the behavior enough that we can substantially reduce
the default pool size and generations count, thereby decreasing the runtime,
and yet get as good or better plans as we were getting in 7.4.  Consequently,
adjust the default GEQO parameters.  I also modified the way geqo_effort is
used so that it affects both population size and number of generations;
it's now useful as a single control to adjust the GEQO runtime-vs-plan-quality
tradeoff.  Bump geqo_threshold to 12, since even with these changes GEQO
seems to be slower than the regular planner at 11 relations.
 		2004-01-23 23:54:21 +00:00
config Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00
contrib Correct type for isalnum 2004-01-19 18:39:45 +00:00
doc Revise GEQO planner to make use of some heuristic knowledge about SQL, namely 2004-01-23 23:54:21 +00:00
src Revise GEQO planner to make use of some heuristic knowledge about SQL, namely 2004-01-23 23:54:21 +00:00
COPYRIGHT Fix some copyright notices that weren't updated. Improve copyright tool 2003-08-04 23:59:41 +00:00
GNUmakefile.in Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00
HISTORY Regenerate HISTORY for release. 2003-12-22 07:28:29 +00:00
INSTALL Correct gettext URL. 2004-01-04 16:43:52 +00:00
Makefile Restructure the key include files per recent pghackers discussion: there 2001-02-10 02:31:31 +00:00
README Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00
aclocal.m4 Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00
configure Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00
configure.in Remove JDBC from the build system and documentation, too. 2004-01-19 21:20:06 +00:00

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 several language
bindings, including C and Tcl.

The JDBC, ODBC, C++, and Python interfaces have been moved to the PostgreSQL
Projects Web Site at http://gborg.postgresql.org for separate maintenance.
A Perl DBI/DBD driver is available from CPAN.

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
ftp://ftp.postgresql.org/pub/.  For more information look at our web
site located at http://www.postgresql.org/.