The mysqltuning script was run again:
perl /usr/local/bin/mysqltuner.pl
>> MySQLTuner 1.2.0 - Major Hayden <major@mhtx.net>
>> Bug reports, feature requests, and downloads at http://mysqltuner.com/
>> Run with '--help' for additional options and output filtering
[OK] Logged in using credentials from debian maintenance account.
-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.1.66-0+squeeze1
[OK] Operating on 64-bit architecture
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 1G (Tables: 150)
[--] Data in InnoDB tables: 23M (Tables: 62)
[!!] Total fragmented tables: 67
-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned
-------- Performance Metrics -------------------------------------------------
[--] Up for: 4d 16h 42m 56s (1M q [3.250 qps], 53K conn, TX: 8B, RX: 819M)
[--] Reads / Writes: 80% / 20%
[--] Total buffers: 162.0M global + 2.7M per thread (151 max threads)
[OK] Maximum possible memory usage: 567.8M (27% of installed RAM)
[OK] Slow queries: 0% (20/1M)
[OK] Highest usage of available connections: 7% (12/151)
[OK] Key buffer size / total MyISAM indexes: 16.0M/294.0M
[OK] Key buffer hit rate: 99.8% (68M cached / 126K reads)
[OK] Query cache efficiency: 26.6% (252K cached / 951K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 70K sorts)
[OK] Temporary tables created on disk: 14% (17K on disk / 121K total)
[OK] Thread cache hit rate: 99% (22 created / 53K connections)
[!!] Table cache hit rate: 13% (483 open / 3K opened)
[OK] Open file limit used: 12% (530/4K)
[OK] Table locks acquired immediately: 99% (918K immediate / 918K locks)
[OK] InnoDB data size / buffer pool: 23.7M/64.0M
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
Enable the slow query log to troubleshoot bad queries
Increase table_cache gradually to avoid file descriptor limits
Variables to adjust:
table_cache (> 2048)
And the table_cache in /etc/mysql/my.cnf was doubled to 4096 and mysql was restarted.
This probably isn't worth increasing further (and perhaps is now too high) setting it too high can make things slower, currently we have 263 tables in total:
mysql information_schema
mysql> SELECT COUNT(*) FROM tables;
+----------+
| COUNT(*) |
+----------+
| 263 |
+----------+
1 row in set (0.01 sec)
