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I wouldn't say slony is less proven or battle hardened. Being one of the very few postgres replication solutions that actually work it is currently in use pretty much everywhere where replication is required.

I think slony is less popular than mysql replication because it is a royal pain the ass to setup and maintain. In mysql you flip a switch and have replication. It has a few known issues but is "mostly" reliable and understood.

In postgres/slony you enter the wonderful world of triggers and several layers of magic.

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