如何删除卸载Linux自带的MySQL

由于redhat Enterprise 5 中自带一个mysql的版本，如果在安装linux前未选择mysql的安装此步就可跳过，因为我当时安装了现在将其卸载 ，步骤如下：
       a. 查找已安装的myslq 版本：

        #rpm  -qa | grep  mysql （注意大小写，如果mysql 不行就换MySQL）

出现：
[ysong@sva_rec mysql]$ rpm  -qa | grep  mysql
mysql-5.0.45-7.el5
libdbi-dbd-mysql-0.8.1a-1.2.2软件开发
mysql-5.0.45-7.el5
mysql-server-5.0.45-7.el5
mysql-connector-odbc-3.51.12-2.2
　卸载后/var/lib/mysql中的数据及/etc/my.cnf不会删除，如果确定没用后就手工删除

　　rm -f /etc/my.cnf

　　rm -rf /var/lib/mysq
后，在输入命令：
[ysong@sva_rec mysql]$ sudo yum -y remove mysql-5.0.45-7.el5
Password:
Loading "security" plugin
Loading "rhnplugin" plugin
This system is not registered with RHN.
RHN support will be disabled.
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package mysql.x86_64 0:5.0.45-7.el5 set to be erased
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: dovecot
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: mysql-server
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: mysql-connector-odbc
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: perl-DBD-MySQL
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: libdbi-dbd-mysql
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: dovecot
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: mysql-server
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: mysql-connector-odbc
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: perl-DBD-MySQL
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: libdbi-dbd-mysql
--> Processing Dependency: libmysqlclient_r.so.15()(64bit) for package: mysql-connector-odbc
--> Processing Dependency: libmysqlclient_r.so.15()(64bit) for package: mysql-server
--> Processing Dependency: libmysqlclient_r.so.15()(64bit) for package: MySQL-python
--> Processing Dependency: libmysqlclient_r.so.15(libmysqlclient_15)(64bit) for package: mysql-connector-odbc
--> Processing Dependency: libmysqlclient_r.so.15(libmysqlclient_15)(64bit) for package: mysql-server
--> Processing Dependency: libmysqlclient_r.so.15(libmysqlclient_15)(64bit) for package: MySQL-python
--> Processing Dependency: mysql for package: libdbi-dbd-mysql
--> Processing Dependency: mysql = 5.0.45-7.el5 for package: mysql-server
--> Processing Dependency: mysql for package: MySQL-python
---> Package mysql.i386 0:5.0.45-7.el5 set to be erased
--> Running transaction check
---> Package mysql-server.x86_64 0:5.0.45-7.el5 set to be erased
---> Package MySQL-python.x86_64 0:1.2.1-1 set to be erased
---> Package libdbi-dbd-mysql.x86_64 0:0.8.1a-1.2.2 set to be erased
---> Package perl-DBD-MySQL.x86_64 0:3.0007-1.fc6 set to be erased
---> Package mysql-connector-odbc.x86_64 0:3.51.12-2.2 set to be erased
---> Package dovecot.x86_64 0:1.0.7-2.el5 set to be erased
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Removing:
 mysql                   x86_64     5.0.45-7.el5     installed         7.5 M
 mysql                   i386       5.0.45-7.el5     installed         7.3 M
Removing for dependencies:
 MySQL-python            x86_64     1.2.1-1          installed         288 k
 dovecot                 x86_64     1.0.7-2.el5      installed         3.7 M
 libdbi-dbd-mysql        x86_64     0.8.1a-1.2.2     installed          55 k
 mysql-connector-odbc    x86_64     3.51.12-2.2      installed         420 k
 mysql-server            x86_64     5.0.45-7.el5     installed          22 M
 perl-DBD-MySQL          x86_64     3.0007-1.fc6     installed         328 k

Transaction Summary
=============================================================================
Install      0 Package(s)       
Update       0 Package(s)       
Remove       8 Package(s)       

Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test货运专家
Transaction Test Succeeded
Running Transaction
  Erasing   : mysql-server                 ######################### [1/8]
warning: /var/log/mysqld.log saved as /var/log/mysqld.log.rpmsave
  Erasing   : MySQL-python                 ######################### [2/8]
  Erasing   : mysql                        ######################### [3/8]
  Erasing   : libdbi-dbd-mysql             ######################### [4/8]
  Erasing   : perl-DBD-MySQL               ######################### [5/8]
  Erasing   : mysql-connector-odbc         ######################### [6/8]
  Erasing   : dovecot                      ######################### [7/8]
  Erasing   : mysql                        ######################### [8/8]

Removed: mysql.x86_64 0:5.0.45-7.el5 mysql.i386 0:5.0.45-7.el5
Dependency Removed: MySQL-python.x86_64 0:1.2.1-1 dovecot.x86_64 0:1.0.7-2.el5 libdbi-dbd-mysql.x86_64 0:0.8.1a-1.2.2 mysql-connector-odbc.x86_64 0:3.51.12-2.2 mysql-server.x86_64 0:5.0.45-7.el5 perl-DBD-MySQL.x86_64 0:3.0007-1.fc6
Complete!

[ysong@sva_rec mysql]$
OK,到此，Linux下自带的mysql已经完全卸载，此时，再输入：
[ysong@sva_rec mysql]$ rpm  -qa | grep  mysql
[ysong@sva_rec mysql]$
显示系统已经没有mysql服务；
[ysong@sva_rec mysql]$ netstat -nat
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State    
tcp        0      0 127.0.0.1:2208              0.0.0.0:*                   LISTEN    
tcp        0      0 0.0.0.0:139                 0.0.0.0:*                   LISTEN