在MySQL數據庫中，我們需要根據數據庫的狀態調整一些系統參數，下面為您介紹的是MySQL表鎖情況和文件打開數的調整方法，供您參考。
文件打開數(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 |
- +------------------+-------+
- 比較合適的設置：Open_files / open_files_limit * 100%
MySQL表鎖情況
- MySQL> show global status like 'table_locks%';
- +-----------------------+-----------+
- | Variable_name | Value |
- +-----------------------+-----------+
- | Table_locks_immediate | 490206328 |
- | Table_locks_waited | 2084912 |
- +-----------------------+-----------+
Table_locks_immediate表示立即釋放MySQL表鎖數，Table_locks_waited表示需要等待的MySQL表鎖數，如果Table_locks_immediate / Table_locks_waited > 5000，最好采用InnoDB引擎，因為InnoDB是行鎖而MyISAM是MySQL表鎖，對於高並發寫入的應用InnoDB效果會好些。示例中的服務器Table_locks_immediate / Table_locks_waited = 235，MyISAM就足夠了。
