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Re: Optimizer Decisions change with Storage Engine [MyISAM, InnoDB]
Posted by: KimSeong Loh
Date: July 04, 2007 06:45AM

Did you miss your Primary key for table B and C ? You cannot have auto_increment that is not indexed.

Assuming IDX is your primary key.

The difference is due to the way InnoDB stores the secondary index. InnoDB secondary index has no pointers but the value of the Primary Key, therefore the primary key value is available to the index of InnoDB but not in the index of MyISAM.

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