Which databases support parallel processing across multiple servers?

Posted by David on Server Fault See other posts from Server Fault or by David
Published on 2010-03-12T15:16:15Z Indexed on 2010/06/13 11:12 UTC
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I need a database engine that can utilize multiple servers for processing a single SQL query in parallel. So far I know that this is possible with the some engines, though none of them are feasible for me either because of pricing or missing features. The engines currently known to me are:

MS SQL (enterprise)
DB2 (enterprise)
Oracle (enterprise)
GridSQL
Greenplum

Which other engines have this feature? Do you have any experience with using this feature?

Edit: I have now proposed a method for creating one myself. Any input is welcome.

Edit: I have found another one: Informix Extended Parallel Server

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