Posted by: Charles Siu
Date: December 11, 2012 10:26PM
Currently the performance of MySQL is low. After checking the structure of some tables via phpMyAdmin, I found that the cardinality of some indexes are strange. Sometime the cardinality is 0, and sometime the cardinality is simply the same as the number of rows. After I repair/optimize the tables, the cardinality return back to what I expect and the queries are returned faster than before.
I would like to know if there any way to identify the tables with such issue? Then I will do optimize table for those tables only.
Thanks in advance.
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