安全刪除mysql主從復制二進制日志技巧

mysql主從復制日志如果我們不小心很可能導致mysql啟動不了同時導致主從配置出問題，下面我來介紹安全的刪除mysql主從二進制日志的方法。

//刪除日志之前，先檢查主從服務器當前使用的日志文件,

 

 代碼如下 復制代碼

//首先登錄 要刪除日志的服務器的 mysql 終端
#mysql -u root -pxxxxx

//檢查復制主服務器狀態
Mysql>show master status

+------------------+-----------+--------------+----------------------------------------+
| File             | Position  | Binlog_Do_DB | Binlog_Ignore_DB                       |
+------------------+-----------+--------------+----------------------------------------+
| mysql-bin.000097 | 541677824 | www      | test,mysql,information_schema |
+------------------+-----------+-------------+----------------------------------------+

//復制主服務器當前正在使用的日志文件是:mysql-bin.000097

 

 代碼如下 復制代碼

//檢查復制從服務器狀態
Mysql>show slave statusG

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 202.102.152.3
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000103
          Read_Master_Log_Pos: 675107897
               Relay_Log_File: www-relay-bin.000443
                Relay_Log_Pos: 675097929
        Relay_Master_Log_File: mysql-bin.000103
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: www
          Replicate_Ignore_DB: test,mysql,information_schema
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 675107897
              Relay_Log_Space: 675098125
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:

//復制從服務器當前正在使用的復制主服務器日志文件是:mysql-bin.000103

//當前正在使用的日志文件是000097,我需要做的是刪除00095號之前的所有日志(預留出最近幾天的日志)

 代碼如下 復制代碼

Mysql>purge master logs to ‘mysql-bin.000095;

#ll /usr/local/mysql/var/

//從結果中發現，編號000097之前的所有日志都已經刪除

//如果還有其他服務器需要清理日志,重新按上面的順序進行就可以