====== MySQL-Tuner ou comment améliorer la configuration de MySQL ======

**MySQL-Tuner** est un script écrit en //perl// qui analyse le fonctionnement et la configuration de votre serveur **MySQL**.
Les recommandations de cet outils permettra d'améliorer sensiblement l'optimisation de  votre serveur **MySQL**.

===== Installation du script =====

Pour commencer, nous récupérons le script puis ensuite nous le rendrons exécutable.

<code sh>
cd /root
wget 'https://raw.github.com/major/MySQLTuner-perl/master/mysqltuner.pl' --quiet --no-check-certificate --output-document='/usr/local/bin/mysqltuner'
chmod +x '/usr/local/bin/mysqltuner'
</code>

===== Exécution de MySQL-Tuner =====

Pour exécuter ce script il suffit de lancer la commande suivante :

<code sh>
mysqltuner
</code>

<WRAP center round tip 60%>
Important : Veuillez attendre au moins 48h après l'installation de **mysqltuner**. Ceci permettra au script d'avoir suffisamment de données pour que les recommandations puissent être pertinente.
</WRAP>

Voici un exemple de recommandations données lors de l'exécution de **mysqltuner**.

<code>
 >>  MySQLTuner 1.4.0 - 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.
[OK] Currently running supported MySQL version 5.5.25-0+deb7u1-log
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MRG_MYISAM +PINBA
[--] Data in PINBA tables: 0B (Tables: 34)
[--] Data in MyISAM tables: 229M (Tables: 1460)
[--] Data in InnoDB tables: 440M (Tables: 114)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 82

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

-------- Performance Metrics -------------------------------------------------
[--] Up for: 32d 0h 4m 41s (31M q [11.422 qps], 876K conn, TX: 67B, RX: 4B)
[--] Reads / Writes: 50% / 50%
[--] Total buffers: 4.2G global + 2.7M per thread (151 max threads)
[OK] Maximum possible memory usage: 4.6G (28% of installed RAM)
[OK] Slow queries: 0% (411/31M)
[OK] Highest usage of available connections: 35% (54/151)
[OK] Key buffer size / total MyISAM indexes: 2.0G/258.9M
[OK] Key buffer hit rate: 99.9% (550M cached / 477K reads)
[OK] Query cache efficiency: 78.0% (16M cached / 21M selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 266K sorts)
[!!] Temporary tables created on disk: 74% (977K on disk / 1M total)
[OK] Thread cache hit rate: 95% (41K created / 876K connections)
[!!] Table cache hit rate: 0% (400 open / 163K opened)
[OK] Open file limit used: 48% (495/1K)
[OK] Table locks acquired immediately: 98% (8M immediate / 8M locks)
[!!] InnoDB  buffer pool / data size: 128.0M/440.1M
[OK] InnoDB log waits: 0
-------- Recommendations -----------------------------------------------------
General recommendations:
    Run OPTIMIZE TABLE to defragment tables for better performance
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries without LIMIT clauses
    Increase table_open_cache gradually to avoid file descriptor limits
    Read this before increasing table_open_cache over 64: http://bit.ly/1mi7c4C
Variables to adjust:
    tmp_table_size (> 16M)
    max_heap_table_size (> 16M)
    table_open_cache (> 400)
    innodb_buffer_pool_size (>= 440M)
</code>

===== Auteurs et sources =====

  * Auteur : [[:user:montuy337513]]
  * Sources : [[https://github.com/major/MySQLTuner-perl/|Site officiel du projet]]

===== Navigation =====

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