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mysql學習之-密碼管理(預設密碼,修改密碼,解決忘記密碼)

1. mysql安裝後預設沒有密碼,初始化安裝後預設密碼登入,需要馬上修改root密碼。

[root@mysql ~]# cat /root/.mysql_secret    --檢視root賬号密碼

# The random password set for the root user at Tue Dec 13 18:59:06 2016 (local time): 7MhtyX3aZEl9OUf8

[root@mysql ~]# mysql -uroot -p    -- 登入mysql

Enter password:               --(此處複制粘貼 7MhtyX3aZEl9OUf8)

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.25

Copyright (c) 2000, 2015, 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.

說明:  出現mysql>   表示一切順利成功。

2.  修改密碼

mysql> SET PASSWORD = PASSWORD('123456');   --設定密碼為123456

[root@mysql etc]# mysql -uroot -p123456     --修改密碼後,登入

Warning: Using a password on the command line interface can be insecure.

Your MySQL connection id is 39

Server version: 5.6.25 MySQL Community Server (GPL)

mysql>     --登入成功

3. 忘記mysql資料庫root的密碼後,如何修改密碼。

[root@mysql etc]# service mysql stop   --停止mysql程序

Shutting down MySQL.... SUCCESS! 

[root@mysql etc]# mysqld_safe --skip-grant-tables&  --啟動mysql時不啟動grant-tables,授權表。執行後出現下面畫面,另起一個新會話。

[1] 3574

[root@mysql etc]# 161215 06:13:53 mysqld_safe Logging to '/var/lib/mysql/mysql.err'.

161215 06:13:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

[root@mysql ~]# ps -ef|grep mysql   --檢視mysql程序是否起來

root       3467   3440  0 05:29 pts/2    00:00:00 mysql -uandy -px xx

root       3574   2845  0 06:13 pts/0    00:00:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tables

mysql      3677   3574  2 06:13 pts/0    00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-

mysql> UPDATE user SET password=PASSWORD('cccccc') WHERE user='root';   --更改root密碼

Query OK, 4 rows affected (0.04 sec)

Rows matched: 4  Changed: 4  Warnings: 0

mysql> FLUSH PRIVILEGES;    --權限更新

Query OK, 0 rows affected (0.00 sec)

[root@mysql ~]# mysql -uroot -p123456    --使用舊密碼登入,發現不行,說明密碼已經更新

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

[root@mysql ~]# mysql -uroot -pcccccc   --新密碼登入成功

mysql>

本文轉自 張沖andy 部落格園部落格,原文連結:  http://www.cnblogs.com/andy6/p/6181401.html ,如需轉載請自行聯系原作者