MySQL常用命令

1 查看锁表进程。
2 SELECT * FROM information_schema.INNODB_TRX\G
3 trx_mysql_thread_id:11111
4 
5 杀死锁表进程。
6 kill 11111

1 #设置全局只读
2 set global read_only=1;
3 
4 #取消全局只读
5 set global read_only=0;

1 #获取数据库每个ip的连接数
2 # /usr/local/mysql/bin/mysql -u root -h127.0.0.1 -e"show processlist\G;"| egrep "Host\:" | awk -F: ‘{ print $2 }‘| sort | uniq -c 
3 
4 # /usr/local/mysql/bin/mysql -u root -h127.0.0.1 --skip-column-names -e"show processlist;"|awk ‘{print $3}‘|awk -F":" ‘{print $1}‘|sort|uniq -c
5 
6 mysql> select SUBSTRING_INDEX(host,‘:‘,1) as ip , count(*) from information_schema.processlist group by ip;

1 #手动删除binlog
2 mysql> purge master logs to ‘master-bin.000480‘;    #删除master-bin.000480之前的二进制日志

1 #增加读锁
2 mysql> flush tables with read lock;
3 mysql> unlock tables; #释放读锁

1 #创建数据库以utf8格式
2 CREATE DATABASE oma DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
3 
4 #mysql source命令乱码