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Tom Lane 3bf25a2a16 Back-patch contrib/vacuumlo's new -l (limit) option into 9.0 and 9.1. 
Since 9.0, removing lots of large objects in a single transaction risks
exceeding max_locks_per_transaction, because we merged large object removal
into the generic object-drop mechanism, which takes out an exclusive lock
on each object to be dropped.  This creates a hazard for contrib/vacuumlo,
which has historically tried to drop all unreferenced large objects in one
transaction.  There doesn't seem to be any correctness requirement to do it
that way, though; we only need to drop enough large objects per transaction
to amortize the commit costs.

To prevent a regression from pre-9.0 releases wherein vacuumlo worked just
fine, back-patch commits b69f2e3640 and
64c604898e, which break vacuumlo's deletions
into multiple transactions with a user-controllable upper limit on the
number of objects dropped per transaction.

Tim Lewis, Robert Haas, Tom Lane
2012-03-21 13:05:05 -04:00
config Don't reject threaded Python on FreeBSD. 2012-02-20 16:21:41 -05:00
contrib Back-patch contrib/vacuumlo's new -l (limit) option into 9.0 and 9.1. 2012-03-21 13:05:05 -04:00
doc Back-patch contrib/vacuumlo's new -l (limit) option into 9.0 and 9.1. 2012-03-21 13:05:05 -04:00
src Don't allow CREATE TABLE AS to put relations in pg_global. 2012-03-21 12:38:56 -04:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:06 +02:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Stamp 9.0.7. 2012-02-23 17:56:26 -05:00
configure.in Stamp 9.0.7. 2012-02-23 17:56:26 -05:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Back-patch replacement of README.CVS with README.git. 2010-09-21 14:42:58 -04:00
Makefile Add new make targets "world", "install-world" and "installcheck-world" to build, install and check just about everything. 2010-01-28 23:59:52 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.git Back-patch replacement of README.CVS with README.git. 2010-09-21 14:42:58 -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/.