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Displaying posts with tag: query_cache_size (reset)

What’s up with the advice tools ?
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For the first time since the beginning of my long long career, I decided today to use an advice tool to check my MySQL configuration.

I decided to launch pt-variable-advisor and mysqltuner V2 on one of my MySQL server.
Here are the result outputs :

Then I ask myself what to do with these results, just raw results without much explanations, these tools are supposed to be done for beginners…


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MySQL Query Cache path
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Just how effective is the Query Cache on performance? If you are not comfortable reading the MySQL code you can cheat very easily with the SHOW PROFILE command. This demonstration will show you at a high level the relative impact without and with the Query Cache. First let us confirm the Query Cache is not used.

mysql> SHOW GLOBAL VARIABLES LIKE 'query_cache%';
+------------------------------+---------+
| Variable_name                | Value   |
+------------------------------+---------+
| query_cache_limit            | 1048576 |
| query_cache_min_res_unit     | 4096    |
| query_cache_size             | 0       |
| query_cache_type             | ON      |
| …
  [Read more...]
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