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Merge vs. UNION ALL
Posted by: James McKelvey
Date: April 05, 2011 10:33AM

Suppose that instead of using the MERGE engine I instead modified my code to UNION ALL the shards.

Would I get worse performance? In other words, besides the convenience, does the MERGE engine have specific performance optimizations that make it perform better?

This is of interest for several reasons. First, my code could determine in some cases that only a few (or a single) shards were needed. Second, I could apply the shard technique to InnoDB tables. Third, I could apply the shard technique to databases that were not identical.

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April 05, 2011 10:33AM


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