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Re: When need to increase table_open_cache
Posted by: Rick James
Date: June 04, 2016 05:24PM

1433454 tables were opened in the last hour? That is a lot. In the last Year? That is insignificant. My recommendations:

Opened_tables / Uptime < 2 tables opened per second.
table_open_cache < open_files_limit / 3
If Open_tables is too much smaller than table_open_cache, them maybe the cache is too big.
Table_open_cache_misses / Uptime < 1 per second
Table_open_cache_overflows / Uptime < 1 per second

Keep in mind that the OS has a limit on files (ulimit) which feeds to open_files_limit, which constrains table_open_cache.

See also table_definition_cache, innodb_open_files, table_open_cache_instances

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