MySQL Forums
Forum List  »  Performance

table_cache
Posted by: Julian König
Date: August 13, 2015 01:19AM

Hello,

after arround 3 days uptime mysqltuner want always that I increase the table_cache.

The Load is always the same but table_cache is never enuch for me. I dont understand this.

Should I increase table_cache more?

-------- Performance Metrics -------------------------------------------------
[--] Up for: 4d 23h 8m 22s (39M q [93.036 qps], 4M conn, TX: 13B, RX: 2B)
[--] Reads / Writes: 53% / 47%
[--] Total buffers: 310.0M global + 2.7M per thread (450 max threads)
[OK] Maximum possible memory usage: 1.5G (26% of installed RAM)
[OK] Slow queries: 0% (310/39M)
[OK] Highest usage of available connections: 49% (223/450)
[OK] Key buffer size / total MyISAM indexes: 100.0M/61.1M
[OK] Key buffer hit rate: 99.9% (335M cached / 446K reads)
[OK] Query cache efficiency: 51.1% (8M cached / 15M selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 236K sorts)
[OK] Temporary tables created on disk: 22% (17K on disk / 77K total)
[OK] Thread cache hit rate: 97% (87K created / 4M connections)
[!!] Table cache hit rate: 16% (268 open / 1K opened)
[OK] Open file limit used: 0% (341/190K)
[OK] Table locks acquired immediately: 99% (15M immediate / 16M locks)

-------- Recommendations -----------------------------------------------------
General recommendations:
Add skip-innodb to MySQL configuration to disable InnoDB
Run OPTIMIZE TABLE to defragment tables for better performance
Increase table_cache gradually to avoid file descriptor limits
Variables to adjust:
table_cache (> 95000)

Options: ReplyQuote


Subject
Views
Written By
Posted
table_cache
3459
August 13, 2015 01:19AM
1036
August 15, 2015 04:19PM
1129
August 16, 2015 01:24PM
1277
August 17, 2015 09:30AM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.