在MySQL数据库中，我们需要根据数据库的状态调整一些系统参数，下面为您介绍的是MySQL表锁情况和文件打开数的调整方法，供您参考。
文件打开数(open_files)
mysql> show global status like 'open_files'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Open_files | 1410 | +---------------+-------+ mysql> show variables like 'open_files_limit'; +------------------+-------+ | Variable_name | Value | +------------------+-------+ | open_files_limit | 4590 | +------------------+-------+ 比较合适的设置：Open_files / open_files_limit * 100%
MySQL表锁情况
mysql> show global status like 'table_locks%'; +-----------------------+-----------+ | Variable_name | Value | +-----------------------+-----------+ | Table_locks_immediate | 490206328 | | Table_locks_waited | 2084912 | +-----------------------+-----------+
Table_locks_immediate表示立即释放MySQL表锁数，Table_locks_waited表示需要等待的MySQL表锁数，如果Table_locks_immediate / Table_locks_waited > 5000，最好采用InnoDB引擎，因为InnoDB是行锁而MyISAM是MySQL表锁，对于高并发写入的应用InnoDB效果会好些。示例中的服务器Table_locks_immediate / Table_locks_waited = 235，MyISAM就足够了。