mysql sql_thread 执行超慢延迟严重原因是什么呢,查看 master slave 压力都不大、都是innodb 引擎、慢查询 也没有。
主库的binlog 文件已经全部同步到slave 但 sql_thread 执行超慢 执行一个1g 的mysql-slave-relay-bin.004023文件 需要1天
不只为啥 那位帮忙分析一下。
mysql> show full processlist;
+-----+-------------+-----------+------+---------+---------+----------------------------------+------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+-------------+-----------+------+---------+---------+----------------------------------+------------------------+
| 2 | system user | | NULL | Connect | 2394008 | Reading event from the relay log | NULL |
| 309 | system user | | NULL | Connect | 1295 | Waiting for master to send event | NULL |
| 336 | root | localhost | NULL | Query | 0 | NULL | show full processlist |
+-----+-------------+-----------+------+---------+---------+----------------------------------+------------------------+
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.101
Master_User: repu1
Master_Port: 3308
Connect_Retry: 60
Master_Log_File: data.001752 ----master 上最新产生的binlog
Read_Master_Log_Pos: 778855422
Relay_Log_File: mysql-slave-relay-bin.004020
Relay_Log_Pos: 707535938
Relay_Master_Log_File: data.001475
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,test
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: 707535797
Relay_Log_Space: 280026655703
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: 2394076
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1