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Tom Lane 7868590c61 While making the seq_page_cost changes, I was struck by the fact that cost_nonsequential_access() is really totally inappropriate for its only remaining use, namely estimating I/O costs in cost_sort(). The routine was designed on the assumption that disk caching might eliminate the need for some re-reads on a random basis, but there's nothing very random in that sense about sort's access pattern --- it'll always be picking up the oldest outputs. If we had a good fix on the effective cache size we might consider charging zero for I/O unless the sort temp file size exceeds it, but that's probably putting much too much faith in the parameter. Instead just drop the logic in favor of a fixed compromise between seq_page_cost and random_page_cost per page of sort I/O.		2006-06-05 20:56:33 +00:00
config	Emit warnings for unknown configure options.	2006-05-30 13:52:25 +00:00
contrib	Fix wrong NOTICE/ERROR levels	2006-06-02 18:03:06 +00:00
doc	Increase the default value of cpu_index_tuple_cost from 0.001 to 0.005.	2006-06-05 03:03:42 +00:00
src	While making the seq_page_cost changes, I was struck by the fact that	2006-06-05 20:56:33 +00:00
COPYRIGHT	Update copyright for 2006. Update scripts.	2006-03-05 15:59:11 +00:00
GNUmakefile.in	Build src/test/regress/README during tarball making like the other	2006-04-06 18:54:37 +00:00
Makefile	please find attached an alternate submission which addresses open item	2004-10-06 08:50:02 +00:00
README	Update README file.	2006-02-12 19:24:24 +00:00
README.CVS	Some further editorializing on README.CVS.	2004-03-28 06:09:08 +00:00
aclocal.m4	Add new auto-detection of thread flags.	2004-04-23 18:15:55 +00:00
configure	Emit warnings for unknown configure options.	2006-05-30 13:52:25 +00:00
configure.in	Emit warnings for unknown configure options.	2006-05-30 13:52:25 +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 C language bindings.

PostgreSQL has many language interfaces including some of the more
common listed below:

C++ - http://thaiopensource.org/development/libpqxx/
JDBC - http://jdbc.postgresql.org
ODBC - http://odbc.postgresql.org
Perl - http://search.cpan.org/~dbdpg/
PHP - http://www.php.net
Python - http://www.initd.org/
Ruby - http://ruby.scripting.ca/postgres/

Other language binding are available from a variety of contributing
parties.

PostgreSQL also has a great number of procedural languages available,
a short but not complete list is below:

pl/c - Included in PostgreSQL core 
plPgsql - Included in PostgreSQL core - Similar to Oracle PL/sql
plPerl - Included in PostgreSQL core
plPHP - http://projects.commandprompt.com/projects/public/plphp
plPython - Included in PostgreSQL core
plJava - http://gborg.postgresql.org/project/pljava/projdisplay.php
plTcl - Included in PostgreSQL core

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/.