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One of the other nice things about Postgres is the pretty much annual release of a new version. 9.2 should apparently hit beta in the next week or so, which will bring some cool new features : http://archives.postgresql.org/pgsql-hackers/2012-05/msg0034... .

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Are there any reasons not to use postgres, as a replacement for mysql?

If you have a DBA that knows MySQL extremely well and doesn't need to change. If you have a existing system running well, and the future roadmap of your development doesn't make staying with MySQL difficult.

I am totally a Postgres fan, but there are many sensible reasons not to upset the apple cart.

If you use multi-master replication, MySQL Cluster, or depend on properties of one of the alternative storage engines would be my big ones.

Hopefully PostgreSQL-XC might fix this lack of good multi-master replciation in a couple of years. PostgreSQL-XC 1.0 will be released soon.

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