MySQL常用命令

查看锁表进程。
SELECT * FROM information_schema.INNODB_TRX\G
trx_mysql_thread_id:11111

杀死锁表进程。
kill 11111

#设置全局只读
set global read_only=1;

#取消全局只读
set global read_only=0;

#获取数据库每个ip的连接数
# /usr/local/mysql/bin/mysql -u root -h127.0.0.1 -e"show processlist\G;"| egrep "Host\:" | awk -F: '{ print $2 }'| sort | uniq -c

# /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

mysql> select SUBSTRING_INDEX(host,':',1) as ip , count(*) from information_schema.processlist group by ip;

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

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

#创建数据库以utf8格式
CREATE DATABASE oma DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

#mysql source命令乱码
在mysql命令连接数据库的时候指定该参数：--default-character-set = utf8