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Re: Query Cache
Posted by: Harrison Fisk
Date: March 22, 2005 12:22PM

Hi,

The query_cache_size variable is measured in bytes. The 20KB you are setting it to is too small for it so it effectively turns it off.
When I tried it I got the following:

mysql> set global query_cache_size = 20000;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show warnings;
+---------+------+-----------------------------------------------------------------+
| Level | Code | Message |
+---------+------+-----------------------------------------------------------------+
| Warning | 1282 | Query cache failed to set size 19456; new query cache size is 0 |
+---------+------+-----------------------------------------------------------------+
1 row in set (0.00 sec)


Try setting it to a larger size, the smallest possible size is around 50KB (even though that is extremely small), with a larger size more recommended. Common settings for it would be 8-64MB

Harrison Fisk, Trainer and Consultant
MySQL AB, www.mysql.com

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