New stable release: 1.2.1

[Wolfgang Meier-2]

eXist 1.2.1 is mainly a bug fix release, which addresses a number of
stability- and performance-critical issues. All releases in the 1.2
series are considered to be stable. They are limited to hand-selected
changes, which have been ported from the current development trunk.
New features or major code changes will be part of the 1.3 development
series.

We nevertheless count more than 60 bug fixes in 1.2.1!

In particular, an error in the computation of node ids caused database
corruptions after repeatedly removing, then re-inserting nodes into a
document tree. This bug has been around for a while. Applications
which rely on XUpdate or XQuery update extensions should be updated to
the new version!

We also fixed a few performance issues, including problems introduced
by the new XQuery optimizer. Concerning concurrency, a bug in the
locking code could considerably slow down eXist in a multi-user
environment, and another issue led to the infamous and usually fatal
"document id and proxy id differ" errors, which were reported by
users. 1.2.1 also features a new consistency check tool, which should
help to detect and fix errors earlier.

A detailed change log is available:

http://demo.exist-db.org/xquery/svnlog.xq

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[Peter Crowther]

> From: Wolfgang Meier
> eXist 1.2.1 is mainly a bug fix release, which addresses a number of
> stability- and performance-critical issues.

Congratulations, and kudos to you and the team for getting a new stable release out.  Particularly with the consistency checker, it's going to be much easier to persuade clients that eXist provides the stability and recoverability they need before they trust their business data to any database.

Thanks for continuing to develop eXist.

                - Peter

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