8、登录mysql mysql -urot -p 单实例 mysql -uroot -p -S /data/3306/mysql.sock 多实例 9、MySQL帮助命令help mysql> help For information about MySQL products and services, visit: http://www.mysql.com/ For developer information, including the MySQL Reference Manual, visit: http://dev.mysql.com/ To buy MySQL Enterprise support, training, or other products, visit: https://shop.mysql.com/ List of all MySQL commands: Note that all text commands must be first on line and end with ‘;‘ ? (\?) Synonym for `help‘. clear (\c) Clear the current input statement. connect (\r) Reconnect to the server. Optional arguments are db and host. delimiter (\d) Set statement delimiter. edit (\e) Edit command with $EDITOR. ego (\G) Send command to mysql server, display result vertically. exit (\q) Exit mysql. Same as quit. go (\g) Send command to mysql server. help (\h) Display this help. mysql> show databases like "my%"; +----------------+ | Database (my%) | +----------------+ | mysql | +----------------+ 1 row in set (0.00 sec) mysql> show grants for root@localhost; +---------------------------------------------------------------------+ | Grants for root@localhost | +---------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘localhost‘ WITH GRANT OPTION | | GRANT PROXY ON ‘‘@‘‘ TO ‘root‘@‘localhost‘ WITH GRANT OPTION | +---------------------------------------------------------------------+ 2 rows in set (0.00 sec) mysql> grant all privileges on *.* to system@‘localhost‘ identified by ‘123456‘ with grant option; 增加system用户，并提升为超级管理员，即和root等价的用户，只是名称不同 mysql> delete from mysql.user; 删除所有mysql中的用户 为root账户设置密码方法 [root@centos02 tools]# mysqladmin -uroot password ‘123456‘ 没有密码的用户设置密码命令 [root@centos02 tools]# mysqladmin -uroot -p‘123456‘ password ‘654321‘ -S /data/3306/mysql.sock 适合多实例 修改管理员root密码方法1 [root@centos02 tools]# mysqladmin -uroot -p‘123456‘ password ‘martin‘ [root@centos02 tools]# mysqladmin -uroot -p‘654321‘ password ‘martin‘ -S /data/3306/mysql.sock 适合多实例 修改管理员root密码方法2 mysql> update mysql.user set password=password(‘martin‘) where user=‘root‘; mysql> flush privileges; 第一个password代表要修改的字段 第二个password代表是一个函数 此方法适合密码丢失后通过 --skip-grant-tables参数启动数据库后修改密码 mysql> select user,host,password from mysql.user; +--------+-----------+-------------------------------------------+ | user | host | password | +--------+-----------+-------------------------------------------+ | root | localhost | | | root | centos02 | | | root | 127.0.0.1 | | | root | ::1 | | | | localhost | | | | centos02 | | | system | localhost | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | +--------+-----------+-------------------------------------------+ mysql> update mysql.user set password=password(‘martin‘) where user=‘system‘; Query OK, 1 row affected (0.14 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> flush privileges; Query OK, 0 rows affected (0.05 sec) mysql> quit Bye [root@centos02 tools]# mysql -usystem -pmartin Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.5.49 MySQL Community Server (GPL) Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. mysql> 找回丢失的mysql密码 1、先停止数据库 [root@centos02 tools]# /etc/init.d/mysqld stop 2、使用 --skip-grant-tables 启动mysql，忽略授权登录验证 [root@centos02 tools]# /application/mysql/bin/mysqld_safe --skip-grant-tables --user=mysql & [root@centos02 tools]# mysql -uroot -p 登录时空密码 mysql> update mysql.user set password=password(‘123456‘) where user=‘root‘ and host=‘localhost‘; #修改密码为123456 Query OK, 0 rows affected (0.06 sec) Rows matched: 1 Changed: 0 Warnings: 0 mysql> flush privileges; Query OK, 0 rows affected (0.11 sec) [root@centos02 tools]# mysqladmin -uroot -p123456 shutdown 优雅的关闭数据库 160802 13:01:47 mysqld_safe mysqld from pid file /application/mysql/data/centos02.pid ended [1]+ Done /application/mysql/bin/mysqld_safe --skip-grant-tables --user=mysql [root@centos02 tools]# [root@centos02 tools]# /etc/init.d/mysqld start Starting MySQL.. [ OK ] [root@centos02 tools]# mysql -uroot -p123456 Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.5.49 MySQL Community Server (GPL) Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. mysql> 多实例找回丢失的密码 killall mysqld mysqld_safe --defaults-file=/data/3306/my.cnf --skip-grant-tables & mysql -uroot -p -S /data/3306/mysql.sock 登录时空密码 mysql> update mysql.user set password=password(‘123456‘) where user=‘root‘ and host=‘localhost‘; #修改密码为123456 mysql> flush privileges; killall mysqld /data/3306/mysql start
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