MySQL (MariaDB) 常见问题

修改用户密码（Mysql 最近几个版本和之前的修改方式不同）

update mysql.user set authentication_string=password('123456') where user='root' and Host = '%';
flush privileges;
​

创建新用户并赋予权限

#创建用户
CREATE USER '[userName]'@'[host]' IDENTIFIED BY '[passwd]';
#赋予权限
GRANT ALL PRIVILEGES ON [dbName].* TO '[userName]'@'[host]';
#刷新权限列表
flush privileges;
​

eg.

CREATE USER 'zhangsan'@'%' IDENTIFIED BY '123456';
GRANT ALL PRIVILEGES ON zsdb.* TO 'zhangsan'@'%';
flush privileges;
​

错误处理

1. ERROR:mysqldump: Couldn't execute 'SHOW VARIABLES LIKE 'gtid\_mode'': Table 'performance_schema.session_variables' doesn't exist (1146)

method:

# 更新
mysql_upgrade -u root -p --force

# 重启服务
service mysql restart

# 备份
mysqldump -u root -p test > test.sql
​