Mysql trucs et astuces

Pas vraiment un howto ici mais plus un recueil de trucs et astuces sur MySQL

Désactiver le performance schéma

Editez le fichier /etc/mysql/mysql.conf.d/mysqld.cnf et ajoutez dedans :

[mysqld]
performance_schema=OFF

Optimiser MySQL

Important

Cette méthode est à vos risques et périls. En cas de soucis aucun support ne sera possible.

• Arrêtez le démon MySQL et supprimez les fichiers de log :

  service mysql stop
  rm /var/lib/mysql/ib_logfile*
  

• Puis faites :

  touch /etc/mysql/conf.d/jeedom_my.cnf
  echo "[mysqld]" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "key_buffer_size = 16M" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "thread_cache_size = 16" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "tmp_table_size = 48M" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "max_heap_table_size = 48M" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "query_cache_type =1" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "query_cache_size = 16M" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "query_cache_limit = 2M" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "query_cache_min_res_unit=3K" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "innodb_flush_method = O_DIRECT" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "innodb_flush_log_at_trx_commit = 2" >> /etc/mysql/conf.d/jeedom_my.cnf
  echo "innodb_log_file_size = 32M" >> /etc/mysql/conf.d/jeedom_my.cnf
  

• Relancez MySQL : service mysql start