linux mysql 卸载，安装，測试全过程

Mysql卸载

yum remove mysql mysql-server mysql-libs compat-mysql51

rm -rf /var/lib/mysql

rm /etc/my.cnf

查看是否还有mysql软件：

rpm -qa|grep mysql

有的话继续删除





Mysql安装

1>若本地没有安装包 能够考虑使用yum命令进行下载

# yum -y install mysql-server

# yum -y install php-mysql

2>安装后，MySQL自己主动启动，默认没实username和password，设置新password

#   /usr/bin/mysqladmin -u root password 'aaaaaa'

[root@luozhonghua ~]#   /usr/bin/mysqladmin -u root password 'aaaaaa'

/usr/bin/mysqladmin: connect to server at 'localhost' failed

error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'

Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!

解决：

2.1》/etc/rc.d/init.d/mysqld status 看看mysql是否已经启动

3.2》service mysqld start

3>登录MySQL

>mysql -u root -p

enter password:’aaaaaa’





4>赋权连接的主机

#grant select,insert,update,delete on *.* to root@192.168.1.101  identified by 'aaaaaa'

grant select,insert,update,delete on *.* to root@127.0.0.1  identified by 'aaaaaa';









5>更改默认字符集

# cp my-medium.cnf  /etc/my.cnf

在[client]下增加 default-character-set=utf8

在[mysqld]下增加 default-character-set=utf8

查找安装路径

Rpm -qa | grep mysql

Rpm -ql 包名

[root@luozhonghua charsets]# find /usr -name my-medium.cnf

/usr/share/doc/mysql-server-5.1.73/my-medium.cnf

/usr/share/mysql/my-medium.cnf





#6>设置mysql开机自启动

# vi /etc/rc.local

增加例如以下一行

#/usr/share/mysql/mysql.server start

7>又一次启动MySQL

# /etc/init.d/mysql restart

service mysqld restart





8>測试;





[root@luozhonghua ~]# mysql -u root -p

Enter password:

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

Your MySQL connection id is 3

Server version: 5.1.73 Source distribution





Copyright (c) 2000, 2013, 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> create database xxx

    -> ;

Query OK, 1 row affected (0.06 sec)





mysql> ls

    -> ;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th                                                                                at corresponds to your MySQL server version for the right syntax to use near                        
                                                        'ls' at line 1

mysql> show databases

    -> ;

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

| Database           |

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

| information_schema |

| mysql              |

| test               |

| xxx                |

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

4 rows in set (0.06 sec)





mysql> use xxx;

Database changed

mysql> show database

    -> ;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th                                                                                at corresponds to your MySQL server version for the right syntax to use near                        
                                                        'database' at line 1

mysql> show databases;

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

| Database           |

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

| information_schema |

| mysql              |

| test               |

| xxx                |

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

4 rows in set (0.01 sec)





mysql> use xxx;

Database changed

mysql> create table test(

    -> int id not null,

    -> varchar(20) name null);

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th                                                                                at corresponds to your MySQL server version for the right syntax to use near                        
                                                        'int id not null,

varchar(20) name null)' at line 2

mysql> show tables;

Empty set (0.00 sec)





mysql> create table dbtest (

    -> id int ,

    -> name varchar);

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th                                                                                at corresponds to your MySQL server version for the right syntax to use near                        
                                                        ')' at line 3

mysql> create table dbtest (

    -> id int,

    -> name varchar(10));

Query OK, 0 rows affected (0.07 sec)





mysql> show tables;

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

| Tables_in_xxx |

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

| dbtest        |

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

1 row in set (0.01 sec)





mysql> drop table xxx;

ERROR 1051 (42S02): Unknown table 'xxx'

mysql> drop table dbtest;

Query OK, 0 rows affected (0.00 sec)





mysql> ls

    -> ;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th                                                                                at corresponds to your MySQL server version for the right syntax to use near                        
                                                        'ls' at line 1

mysql> show tables;

Empty set (0.00 sec)





mysql>