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Re: Explain plans for InnoDB and Memory Engines
Posted by: Øystein Grøvlen
Date: May 04, 2016 05:17AM

Hi Jagan,

Different storage engines will have different capabilities and MEMORY does not support all operations that INNODB does. A query plan for an InnoDB that may then use capabilities that are not available for a similar MEMORY table.

Note also that for MEMORY engine, indexes are by default hash-based. If you want B-Tree indexes, you will need to explicitly say so. Some execution strategies may require a B-Tree index.

Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway

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