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Re: MySQL Performance Tuning Help
Posted by: Rick James
Date: October 05, 2010 07:31PM

Be sure to use GLOBAL, not the default of SESSION:
mysql> SHOW STATUS LIKE 'Opened_tables';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Opened_tables | 0     |
+---------------+-------+

mysql> SHOW GLOBAL STATUS LIKE 'Opened_tables';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Opened_tables | 460   |
+---------------+-------+

Then divide that by Uptime to get per-second.  Increase the table cache until that quotient is less than 1/sec.

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