MySQL/MariaDB数据库的用户和权限管理

                                   作者:尹正杰

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一.元数据数据库(mysql)

系统授权表(均在mysql数据库中):
  db 
  host 
  user:
    存放用户的表。   columns_priv   tables_priv   procs_priv   proxies_priv
MariaDB [yinzhengjie]> SELECT  user,host FROM mysql.user;        #查看MySQL实例安全初始化后的默认用户
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | ::1       |
| root | localhost |
+------+-----------+
3 rows in set (0.00 sec)

MariaDB [yinzhengjie]> 
MariaDB [yinzhengjie]> 
MariaDB [yinzhengjie]> SELECT user,host FROM mysql.user;        #查看MySQL实例安全初始化后的默认用户

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