1、查看数据库的版本信息：
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MariaDB [(none)]> select version();
+----------------+| version() |+----------------+| 5.5.52-MariaDB |+----------------+1 row in set (0.18 sec)
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2、删除多余的账号（除root和localhost的）
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MariaDB [(none)]> use mysqlMariaDB [mysql]> select user,host from mysql.user;
+------+------------------------+| user | host |+------+------------------------+| root | 127.0.0.1 || root | ::1 || | localhost || root | localhost || | lvs-dr01.saltstack.com || root | lvs-dr01.saltstack.com |+------+------------------------+6 rows in set (0.03 sec)
MariaDB [mysql]> delete from mysql.user where (user,host) not in (select 'root','localhost');
Query OK, 5 rows affected (0.05 sec)MariaDB [mysql]> select user,host from mysql.user;
+------+-----------+| user | host |+------+-----------+| root | localhost |+------+-----------+1 row in set (0.05 sec)
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3、修改mysql默认的mysql管理账号
修改默认的mysql管理账号（root改为mysql，并设置新密码为redhat12345）
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MariaDB [mysql]> update user set user="admin" where user="root";
MariaDB [mysql]> update mysql.user set user='admin',password=password('redhat12345');
Query OK, 1 row affected (0.08 sec)Rows matched: 1 Changed: 1 Warnings: 0MariaDB [mysql]> flush privileges;Query OK, 0 rows affected (0.03 sec)[root@LVS-DR01 ~]# mysql -uadmin -p'redhat12345'
MariaDB [(none)]> user mysql；MariaDB [mysql]> show tables; |
继续查询：
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MariaDB [mysql]> select user,host from mysql.user;
+-------+-----------+| user | host |+-------+-----------+| admin | localhost |+-------+-----------+1 row in set (0.00 sec)
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4、删除test数据库：
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MariaDB [mysql]> drop database test;
MariaDB [mysql]> flush privileges;MariaDB [(none)]> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema |+--------------------+3 rows in set (0.06 sec)
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5、优化权限字典表mysql.db
如下所示：新建MySQL数据库后，默认创建的test数据库权限比较怪异，所有可连接的用户都能够拥有权限访问该库，并操作其中的对象，Host为%，User为空，说明了不受限制，所有能连接到MySQL的用户，全部拥有test及test开头的数据库的几乎所有权限。
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MariaDB [mysql]> select * from mysql.db where db like 'test%' \G
*************************** 1. row *************************** Host: %
Db: test
User:
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Grant_priv: N
References_priv: Y
Index_priv: Y
Alter_priv: Y
Create_tmp_table_priv: Y Lock_tables_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: N
Execute_priv: N
Event_priv: Y
Trigger_priv: Y
*************************** 2. row *************************** Host: %
Db: test\_%
User:
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Grant_priv: N
References_priv: Y
Index_priv: Y
Alter_priv: Y
Create_tmp_table_priv: Y Lock_tables_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: N
Execute_priv: N
Event_priv: Y
Trigger_priv: Y
2 rows in set (0.31 sec)
优化的操作：MariaDB [mysql]> truncate table mysql.db;Query OK, 0 rows affected (0.01 sec)MariaDB [mysql]> select * from mysql.db where db like 'test%' \G
Empty set (0.00 sec)
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6、如何优化/root/.mysql_history文件
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[root@LVS-DR01 ~]# tail -20 ~/.mysql_history
flush privileges;select user,host from mysql.user;
delete from mysql.user where user="'molewan1'@'10.10.10.%'";
delete from mysql.db where user='molewan1'@'10.10.10.%';
select user,host from mysql.user;
delete from mysql.user where user=molewan1;delete from mysql.user where user='molewan1@10.10.10.%';
flush privileges;select user,host from mysql.user;
delete from mysql.user where user="molewan1" and host ="10.10.10.%";
flush privileges;select user,host from mysql.user;
delete from mysql.user where user="molewan" and host="10.10.10.%";
flush privileges;create user molewan@'10.10.10.%' identified by 'molewan';
select user,host from mysql.user;
desc mysql.user;update mysql.user set password=password('admin') where user='admin' and host='localhost';
flush privileges;\q |
说明：在Linux/Unix系统下，使用mysql命令行工具执行的所有操作，都会被记录到一个名为.mysql_history的文件中，该文件默认保存在当前用户的根目录下
这个设定原本是为了提升mysql命令行操作体验，在mysql中操作命令就可以上下翻动了，但某些情况下缺会造成隐患。
如何消除隐患：
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方法1：基于DB层的操作修改MYSQL_HISTFILE环境变量，将其值改为/dev/null，这样所有的操作都会被输出到空，操作的历史
自然不会被保留。方法2：基于系统层操作仍旧保留这个文件，但是改文件实际上未/dev/null的软链接，这样所有的操作都会被输出到空，操作的历史自然不会被保留。
ln -f -s /dev/null ~/.mysql_history
[root@LVS-DR01 ~]# tail -20 ~/.mysql_history
这时候就没有输出了 |
到此，安装完成后的基本优化已经完成
本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1940496，如需转载请自行联系原作者