麒麟v10 上部署 TiDB v5.1.2 生产环境优化实践
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2023-05-12
分享一次生产MySQL数据库主备切换演练
概述
一般生产环境都需要定期去做一次mysql数据库主备切换演练,这里简单记录一下,后面再演示一下备份恢复的一些演练工作。
1、查看主库状态
show processlist; Master has sent all binlog to slave; waiting for binlog to be updated show master status \G
2、查看从库状态
show processlist; show slave status \G
3、从库停止 IO_THREAD 线程
stop slave IO_THREAD; show processlist; show slave status \G
4、从库切换为主库
stop slave; reset master; reset slave all; show master status \G
5、激活帐户
SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user; GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%' IDENTIFIED BY 'xxx; FLUSH PRIVILEGES;
6、切换原有主库为从库(原有主库执行)
reset master; reset slave all; CHANGE MASTER TO MASTER_HOST='1xxx', MASTER_USER='repl', MASTER_PASSWORD='xxx, MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=589;
7、检查主库
SHOW PROCESSLIST; show master status \G
8、启动从库
SHOW PROCESSLIST; start slave; show slave status \G
9、MySQL主从测试
9.1插入数据
9.1.1创建测试表并插入数据
mysql> create table test123(id int(4)); Query OK, 0 rows affected (0.01 sec) mysql> insert into test123 values(1); Query OK, 1 row affected (0.00 sec) mysql> insert into test123 values(2); Query OK, 1 row affected (0.00 sec) mysql> insert into test123 values(3); Query OK, 1 row affected (0.00 sec) mysql> insert into test123 values(4); Query OK, 1 row affected (0.00 sec)
9.1.2从库查询:
9.2 删除数据
9.2.1主库删除表:
mysql> drop table test123;
9.2.2 从库查询:
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