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I was looking for a open source parallel database solution. It seems Postgres-XC is a viable solution. However, I don't need the replication. In this case, is there any better solution towards read optimized parallel architecture ?

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What do you mean by "parallel database"? –  Mike Sherrill 'Cat Recall' Jun 14 '12 at 17:46

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There is pl/proxy, which provides a basic federation capability, but it's not an engine optimised for this sort of work. Greenplum is a commercial product that does have a shared nothing engine that might do what you want. However, it's not cheap - less expensive than Oracle but more expensive than SQL Server.

There are no pure open-source engines of that type for PostgreSQL. However, you might get what you want from PL/Proxy.

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