Tuning MySQL Performance with MySQLTuner

The steps below were taken from the following post: www.howtoforge.com/tuning-mysql-performance-with-mysqltuner

A good explanation for the most important MySQL variables can be found here: www.ibm.com/developerworks/library/l-tune-lamp-3.html

MySQLTuner is a Perl script that analyzes your MySQL performance and, based on the statistics it gathers, gives recommendations which variables you should adjust in order to increase performance. That way, you can tune your my.cnf file to tease out the last bit of performance from your MySQL server and make it work more efficiently.

This document comes without warranty of any kind! I do not issue any guarantee that this will work for you!

1 Using MySQLTuner

You can download the MySQLTuner script as follows:

wget http://mysqltuner.com/mysqltuner.pl

2 Run the perl script with the perl command

In order to run the script you just execute it with the perl command.

perl mysqltuner.pl

>>  MySQLTuner 0.9.8 – Major Hayden <major@mhtx.net>
>>  Bug reports, feature requests, and downloads at http://mysqltuner.com/
>>  Run with ‘–help’ for additional options and output filtering
Please enter your MySQL administrative login: <– root
Please enter your MySQL administrative password: <– yourrootsqlpassword

——– General Statistics ————————————————–
[–] Skipped version check for MySQLTuner script
[!!] Your MySQL version 4.1.11-Debian_etch1-log is EOL software!  Upgrade soon!
[OK] Operating on 32-bit architecture with less than 2GB RAM

——– Storage Engine Statistics ——————————————-
[–] Status: +Archive -BDB -Federated +InnoDB +ISAM -NDBCluster
[–] Data in MyISAM tables: 301M (Tables: 2074)
[–] Data in HEAP tables: 379K (Tables: 9)
[!!] InnoDB is enabled but isn’t being used
[!!] ISAM is enabled but isn’t being used
[!!] Total fragmented tables: 215

——– Performance Metrics ————————————————-
[–] Up for: 12d 18h 33m 30s (1B q [1K qps], 185K conn, TX: 3B, RX: 377M)
[–] Reads / Writes: 78% / 22%
[–] Total buffers: 2.6M per thread and 58.0M global
[OK] Maximum possible memory usage: 320.5M (20% of installed RAM)
[OK] Slow queries: 0% (17/1B)
[OK] Highest usage of available connections: 32% (32/100)
[OK] Key buffer size / total MyISAM indexes: 16.0M/72.3M
[OK] Key buffer hit rate: 99.9%
[OK] Query cache efficiency: 99.9%
[!!] Query cache prunes per day: 47549
[OK] Sorts requiring temporary tables: 0%
[!!] Temporary tables created on disk: 28%
[OK] Thread cache hit rate: 99%
[!!] Table cache hit rate: 0%
[OK] Open file limit used: 12%
[OK] Table locks acquired immediately: 99%
[!!] Connections aborted: 20%

——– Recommendations —————————————————–
General recommendations:
Add skip-innodb to MySQL configuration to disable InnoDB
Add skip-isam to MySQL configuration to disable ISAM
Run OPTIMIZE TABLE to defragment tables for better performance
Enable the slow query log to troubleshoot bad queries
When making adjustments, make tmp_table_size/max_heap_table_size equal
Reduce your SELECT DISTINCT queries without LIMIT clauses
Increase table_cache gradually to avoid file descriptor limits
Your applications are not closing MySQL connections properly
Variables to adjust:
query_cache_size (> 16M)
tmp_table_size (> 32M)
max_heap_table_size (> 16M)
table_cache (> 64)



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