1 用以往的mysql登陸模式登陸
[mysql@eanintmydbc002db1 mysqllog]$ mysql
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3157186
Server version: 5.5.25a-log MySQL EA Release
Copyright (c) 2000, 2011, 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> select current_user();
+----------------+
| current_user() |
+----------------+
| @localhost |
+----------------+
1 row in set (0.01 sec)
mysql>
mysql>
2 奇怪，再次登陸試試看
[mysql@xxxmydbc002db1 mysqllog]$ mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3157145
Server version: 5.5.25a-log MySQL EA Release
Copyright (c) 2000, 2011, 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> show processlist;
ERROR 1227 (42000): Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
mysql> select current_user();
+----------------+
| current_user() |
+----------------+
| @localhost |
+----------------+
1 row in set (0.00 sec)
看到這里竟然沒有用戶名，只有ip地址為localhost，好詭異的狀況，看下當前所有的進程
mysql> show full processlist;
ERROR 1227 (42000): Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
mysql>
3 去用標准的登陸模式mysql -uroot -p -hlocalhost登陸試下，看看問題到底在哪里。
[novamysqladminint@xxmydbc002db1 ~]$ mysql -uroot -p -hlocalhost
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3257823
Server version: 5.5.25a-log MySQL EA Release
Copyright (c) 2000, 2011, 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> select user,host from mysql.user;
+--------------+-------------------------------------+
| user | host |
+--------------+-------------------------------------+
| mmm_agent | % |
| mmm_monitor | % |
| replication | % |
| root | % |
| root | 127.0.0.1 |
| root | ::1 |
| | localhost | 有這個用戶的,那就查下用戶到底是啥權限.
| nuc_monitor | xx.xx.abn-iad.xx.com |
| nuc_monitor | xx.xx.abn-iad.xx.com |
+--------------+-------------------------------------+
23 rows in set (0.00 sec)
mysql> show grants for ''@'localhost';
+--------------------------------------+
| Grants for @localhost |
+--------------------------------------+
| GRANT USAGE ON *.* TO ''@'localhost' | 看到這里，這個用戶只賦予了useage權限，可以connect上面，但是做不了任何操作。
+--------------------------------------+
1 row in set (0.00 sec)
mysql>
解決方案：這個表示你的權限已經被收回了.但是user表里面還有你的記錄.你需要做的是,重新賦予這個用戶權限或者 drop掉這個無用的帳號換一個標准的帳號登陸。
Why ？
在binlog里面去查看了操作記錄以及自己平時的工作記錄，發現當時一個同事在清理帳號的時候，remove了''@'localhost'的權限，但是沒有drop 掉這個用戶，所以在默認mysql登陸的時候，優先選擇了''@'localhost'，而不是用'root'@'localhost'，但是問題來了，為什么執行mysql會優先用''@'localhost'帳號登陸，而不用'root'@'localhost'登陸呢？