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Cardinality Problem
Posted by: Katja Kahl
Date: November 26, 2014 06:53AM

Hi Community,
i have a large table with over 60.000.000 rows, 30.000 insert per day and many updates.

One of my index doesn't works sporadically.

I checked the cardinality with "show index from ..." every 5 minutes.
Normality the value is over 10.000.000, but 1-5 times a day, the value is under 20.

In this case the index will be ignored and the execution time is very slow.



MySql Version: 5.5.8, Engine: InnoDB


Gruß Katja

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