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Re: long running, can't get to use index
Posted by: Peter Brawley
Date: March 24, 2017 10:32AM

General factors: InnoDB table? What is innodb_buffer_pool_size, how much RAM is available to MySQL, does running Analyze Table (to update stats) make a diff?

Specifics: If the table has index(r_userid,r_create_tm,r_status,r_type), you FORCE this index, and yet performance does not much improve, I think you've shown that the optimiser was right in estimating that a table scan would perform just about as well.

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Re: long running, can't get to use index
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March 24, 2017 10:32AM


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