修改方式：

set global log_warnings=2;

MySQL 5.5版本官方文档中，并没有用户锁的状态。因此不存在用户会被锁。。

The account-locking capability depends on the presence of the account_locked column in the

mysql.user table. For upgrades to MySQL 5.7.6 and later from older versions, run mysql_upgrade

to ensure that this column exists. For nonupgraded installations that have no account_locked

column, the server treats all accounts as unlocked, and using the ACCOUNT LOCK or ACCOUNT

UNLOCK clauses produces an error.

MySQL 5.5的用户信息中没有用户锁的字段

4. row

Host: ::1

User: root

Password: *13C230E7E4DDA7CCF4BED86963D2B066390F3E56

Select_priv: Y

Insert_priv: Y

Update_priv: Y

Delete_priv: Y

Create_priv: Y

Drop_priv: Y

Reload_priv: Y

Shutdown_priv: Y

Process_priv: Y

File_priv: Y

Grant_priv: Y

References_priv: Y

Index_priv: Y

Alter_priv: Y

Show_db_priv: Y

Super_priv: Y

Create_tmp_table_priv: Y

Lock_tables_priv: Y

Execute_priv: Y

Repl_slave_priv: Y

Repl_client_priv: Y

Create_view_priv: Y

Show_view_priv: Y

Create_routine_priv: Y

Alter_routine_priv: Y

Create_user_priv: Y

Event_priv: Y

Trigger_priv: Y

Create_tablespace_priv: Y

ssl_type:

ssl_cipher:

x509_issuer:

x509_subject:

max_questions: 0

max_updates: 0

max_connections: 0

max_user_connections: 0

plugin:

authentication_string:

4 rows in set (0.00 sec)

MySQL 5.7的用户信息中account_locked

2. row

Host: %

User: root

Select_priv: Y

Insert_priv: Y

Update_priv: Y

Delete_priv: Y

Create_priv: Y

Drop_priv: Y

Reload_priv: Y

Shutdown_priv: Y

Process_priv: Y

File_priv: Y

Grant_priv: N

References_priv: Y

Index_priv: Y

Alter_priv: Y

Show_db_priv: Y

Super_priv: Y

Create_tmp_table_priv: Y

Lock_tables_priv: Y

Execute_priv: Y

Repl_slave_priv: Y

Repl_client_priv: Y

Create_view_priv: Y

Show_view_priv: Y

Create_routine_priv: Y

Alter_routine_priv: Y

Create_user_priv: Y

Event_priv: Y

Trigger_priv: Y

Create_tablespace_priv: Y

ssl_type:

ssl_cipher:

x509_issuer:

x509_subject:

max_questions: 0

max_updates: 0

max_connections: 0

max_user_connections: 0

plugin: mysql_native_password

authentication_string: *D61994AAB9327E97C4BECC73E497951CFC723C99

password_expired: N

password_last_changed: 2018-04-14 22:20:00

password_lifetime: NULL

account_locked: N

2 rows in set (0.00 sec)

可以通过如下方式查看用户锁状态、但都仅限MySQL 5.7.6以上

mysql> show create user ‘root‘;

+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| CREATE USER for root@% |

+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| CREATE USER [email protected]%‘ IDENTIFIED WITH ‘mysql_native_password‘ AS ‘*D61994AAB9327E97C4BECC73E497951CFC723C99‘ REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK |

原文：https://blog.51cto.com/7499131/2396007