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Tom Lane 52667d56a3 Rethink the locking mechanisms used for CREATE/DROP/RENAME DATABASE. The former approach used ExclusiveLock on pg_database, which being a cluster-wide lock meant only one of these operations could proceed at a time; worse, it also blocked all incoming connections in ReverifyMyDatabase. Now that we have LockSharedObject(), we can use locks of different types applied to databases considered as objects. This allows much more flexible management of the interlocking: two CREATE DATABASEs need not block each other, and need not block connections except to the template database being used. Similarly DROP DATABASE doesn't block unrelated operations. The locking used in flatfiles.c is also much narrower in scope than before. Per recent proposal.		2006-05-04 16:07:29 +00:00
config	Add CVS tag lines to files that were lacking them.	2006-03-11 04:38:42 +00:00
contrib	Make GIN opclass worked with intarray extensions	2006-05-03 16:31:07 +00:00
doc	Rethink the locking mechanisms used for CREATE/DROP/RENAME DATABASE.	2006-05-04 16:07:29 +00:00
src	Rethink the locking mechanisms used for CREATE/DROP/RENAME DATABASE.	2006-05-04 16:07:29 +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	Rearrange some configure.in comments for better readability.	2006-04-29 20:47:31 +00:00
configure.in	Rearrange some configure.in comments for better readability.	2006-04-29 20:47:31 +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/.