创建MySQL从库

2022-07-10 14:05:00 浏览数 (1)

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我们知道Oracle有DataGuard实时备份数据。能够做主备切换,而MySQL也有自己的一套备库方案。称之为主从复制。

搭建MySQL从库是为了实时同步主库数据,同一时候也能够分担主库的读压力。对数据库端做成读写分离结构。

搭建MySQL主从库注意点:

1.主库和从库的 server-id 一定不能同样。

2.在主库创建replication slave账户。

grant replication slave on *.* to ‘repl’@’192.168.0.232’ identified ‘oracle’;

3.查看主库master状态

mysql> show master status G *************************** 1. row *************************** File: mysql-bin.000005 Position: 251651 Binlog_Do_DB: Binlog_Ignore_DB: 1 row in set (0.00 sec)

4.配置从库

change master to -> master_host=’192.168.0.232′, -> master_user=’repl’, -> master_password=’oracle’, -> master_log_file=’mysql-bin.000005′, -> master_log_pos=251651;

5. 启动从库

slave start

show slave statusG

*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: *********** Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 Read_Master_Log_Pos: 463725968 Relay_Log_File: mysql-relay-bin.000006 Relay_Log_Pos: 463726114 Relay_Master_Log_File: mysql-bin.000005 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: ****************** Replicate_Ignore_DB: 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: 463725968 Relay_Log_Space: 873569451 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: Replicate_Ignore_Server_Ids: Master_Server_Id: 100

注意:

假设从库Slave_IO_Running: No/ Slave_SQL_Running: No

关闭slave

设置set GLOBALSQL_SLAVE_SKIP_COUNTER=1; 在开启slave

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