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MySQL variables - optimization help
Posted by: Marin Smoljan
Date: March 12, 2013 09:33AM

I am new to linux and MySQl,

I have MySQL 5.1 on CentOS 6.3 running Cpanel and have problems editing my.cfn.

I am trying to edit /etc/my.cfn and when I have added some variables MySQL could not start. So I reverted to backup. How it should look like?

when I open /etc/my.cnf I have:


I have run and got this:

-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.1.68-cll
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 1M (Tables: 84)
[--] Data in InnoDB tables: 223M (Tables: 533)
[!!] Total fragmented tables: 24

-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned

-------- Performance Metrics -------------------------------------------------
[--] Up for: 8m 21s (15K q [31.764 qps], 58 conn, TX: 15M, RX: 4M)
[--] Reads / Writes: 99% / 1%
[--] Total buffers: 34.0M global + 2.7M per thread (151 max threads)
[OK] Maximum possible memory usage: 449.2M (5% of installed RAM)
[OK] Slow queries: 0% (0/15K)
[OK] Highest usage of available connections: 3% (5/151)
[OK] Key buffer size / total MyISAM indexes: 8.0M/456.0K
[OK] Key buffer hit rate: 97.1% (2K cached / 85 reads)
[!!] Query cache is disabled
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 4K sorts)
[!!] Joins performed without indexes: 6
[OK] Temporary tables created on disk: 14% (716 on disk / 5K total)
[!!] Thread cache is disabled
[!!] Table cache hit rate: 7% (64 open / 862 opened)
[OK] Open file limit used: 0% (6/1K)
[OK] Table locks acquired immediately: 100% (37K immediate / 37K locks)
[!!] InnoDB data size / buffer pool: 223.9M/8.0M

-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Enable the slow query log to troubleshoot bad queries
Adjust your join queries to always utilize indexes
Set thread_cache_size to 4 as a starting value
Increase table_cache gradually to avoid file descriptor limits
Variables to adjust:
query_cache_size (>= 8M)
join_buffer_size (> 128.0K, or always use indexes with joins)
thread_cache_size (start at 4)
table_cache (> 64)
innodb_buffer_pool_size (>= 223M)

Can you help me editing this and get it working, because if I add changes to it mysql server fails to start


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