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How is PostgreSQL clustering going? I heard that was a pain, whats your setup?

Slony. It is far from perfect though. But at least it is a good and stable way to have a backup database ready.

That's crazy that there were changes to query results from such a minor revision. I haven't experienced anything like that, but maybe my unit testing could be better.

What did you use and how were you doing the unit tests (e.g. tools/processes). Thanks.

Simple JUnit tests for a Repository style class that does database interaction. I can't remember the exact query or details anymore. Just that we were extremely surprised to see that switching back and forth between minor releases gave different results.