PostgreSQL 9.1 Beta 3 Released

The third beta release of PostgreSQL 9.1 is now available. This beta
fixes several issues reported with 9.1 beta 2. All users should help the
project by downloading and testing PostgreSQL 9.1 beta 3 as soon as they
can.

Many users have already helped us by testing Beta 2 and reporting issues
they encountered with it. This included several issues with the new,
innovative Serializable Snapshot Isolation feature.

Among the other issues fixed in the beta3 release are:

* PL/Python build issues
* Poor grammar for NOT VALID CONSTRAINT declaration
* Problems with FOREIGN TABLE documentation
* Broken Btree_GiST operators
* Unsafe weakening of ALTER TABLE locks

Our thanks to users who reported the problems which led to these fixes.

If you tested 9.1 features earlier and reported bugs with Beta 2 or
earlier alphas, please download Beta 3 and test that these issues are
resolved. Users who are able to help with testing version 9.1 should
please read the Beta Testing HOWTO:
http://wiki.postgresql.org/wiki/HowToBetaTest

Since this is a beta version, it is not considered ready for production
use. However, the list of features and the APIs is now stable, so
application developers can begin developing applications against 9.1.
This beta may be followed by more beta releases and one or more release
candidates before final release.

This beta is being released in source form and in one-click installers
for Windows, Mac OSX and Linux. Native Linux packages and binaries for
other operating systems may follow in the next couple weeks.

Links
PostgreSQL home page: http://www.postgresql.org
Downloads page: http://www.postgresql.org/download/
Beta testing information:
http://www.postgresql.org/developer/beta
Beta release notes:
http://www.postgresql.org/docs/9.1/static/release-9-1.html
Beta documentation:
http://www.postgresql.org/docs/9.1/static/index.html