MySQL初始化简单优化

优化数据库

mysql> select host,user from mysql.user;
+-----------+------+
| host      | user |
+-----------+------+
| 127.0.0.1 | root |
| ::1       | root |
| localhost |      |
| localhost | root |
| www       |      |
| www       | root |
+-----------+------+
6 rows in set (0.00 sec)
#删掉用户名为null的
mysql> delete from mysql.user where user=‘‘;
Query OK, 2 rows affected (0.00 sec)

mysql> select host,user from mysql.user;
+-----------+------+
| host      | user |
+-----------+------+
| 127.0.0.1 | root |
| ::1       | root |
| localhost | root |
| www       | root |
+-----------+------+
4 rows in set (0.00 sec)

drop user ‘‘@‘localhost‘;
drop user ‘‘@‘::1‘;
drop user ‘root‘@‘lanny‘;
drop user ‘‘@‘lanny‘;
mysql> select user,host from mysql.user;

mysql>
#有时候drop删不掉(可能包含特殊字符),才会用delete命令
删掉ipv6的:
mysql> delete from mysql.user where host=‘::1‘;
Query OK, 1 row affected (0.00 sec)

mysql> select user,host from mysql.user;
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | localhost |
| root | www       |
+------+-----------+
3 rows in set (0.00 sec)
删掉www的
mysql> delete from mysql.user where host=‘www‘;
Query OK, 1 row affected (0.00 sec)

mysql> select user,host from mysql.user;
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | localhost |
+------+-----------+
2 rows in set (0.00 sec)

mysql>
删掉test库
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.00 sec)

mysql> drop database test;
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)