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UNION/UNION ALL queries and parallel processing
Posted by: Dominique PRUNIER
Date: April 20, 2006 09:39AM

Hi,

I have a single threaded application which batch queries using UNIONs. My question is: does MySql execute independant UNIONs subqueries in parallel or one by one ? Then , is better for me to batch queries in a union or to run parallel queries from several threads in my application ? These queries are mostly CPU consumming, thats why i would get performance hit on SMP architecture with parallel queries.

Thanks

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