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Tom Lane 46e3a16b05 When FOR UPDATE/SHARE is used with LIMIT, put the LockRows plan node 
underneath the Limit node, not atop it.  This fixes the old problem that such
a query might unexpectedly return fewer rows than the LIMIT says, due to
LockRows discarding updated rows.

There is a related problem that LockRows might destroy the sort ordering
produced by earlier steps; but fixing that by pushing LockRows below Sort
would create serious performance problems that are unjustified in many
real-world applications, as well as potential deadlock problems from locking
many more rows than expected.  Instead, keep the present semantics of applying
FOR UPDATE after ORDER BY within a single query level; but allow the user to
specify the other way by writing FOR UPDATE in a sub-select.  To make that
work, track whether FOR UPDATE appeared explicitly in sub-selects or got
pushed down from the parent, and don't flatten a sub-select that contained an
explicit FOR UPDATE.
 		2009-10-28 14:55:47 +00:00
config In the configure check for the Python distutils module, use a less obscure 2009-10-14 21:59:15 +00:00
contrib Fix bogus Assert, per buildfarm results. 2009-09-30 21:26:17 +00:00
doc When FOR UPDATE/SHARE is used with LIMIT, put the LockRows plan node 2009-10-28 14:55:47 +00:00
src When FOR UPDATE/SHARE is used with LIMIT, put the LockRows plan node 2009-10-28 14:55:47 +00:00
COPYRIGHT Update copyright for 2009. 2009-01-01 17:24:05 +00:00
GNUmakefile.in Be able to easily figure out the target directory of "make dist". 2009-08-14 21:37:18 +00:00
Makefile Remove remains of old depend target. 2007-01-20 17:16:17 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.CVS Fix the makefiles to fail cleanly if Perl is needed but not present. This 2009-06-23 03:46:00 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure In the configure check for the Python distutils module, use a less obscure 2009-10-14 21:59:15 +00:00
configure.in Support "samehost" and "samenet" specifications in pg_hba.conf, 2009-10-01 01:58:58 +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, 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/.