myisam自動修復表，默認爲關閉(設置爲""也表示關閉)，可以設置爲OFF, DEFAULT, BACKUP, FORCE, 或 QUICK的組合，一般設置爲BACKUP, FORCE
mysql> show variables like 'myisam_recov%'; +------------------------+--------------+ | Variable_name | Value | +------------------------+--------------+ | myisam_recover_options | BACKUP,FORCE | +------------------------+--------------+ 1 row in set (0.00 sec
改參數不能動態開啓，爲只讀參數，需要重啓mysqld！
參考官方鏈接
http://dev.mysql.com/doc/refman/5.5/en/server-options.html#option_mysqld_myisam-recover-options