Re: performance issue with VARCHAR index
Posted by:
Rick James
Date: August 24, 2010 11:36PM
> As you can see there is an index on all of the where clause fields.
No. You have separate indexes on various fields.
The index you need is a "compound" one:
INDEX(userName, date)
And it may as well replace the one on (userName).
Also, I suspect innodb_buffer_pool_size is low. It should be set to about 70% of available RAM.
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