MYSQL错误汇总

问题描述：启动MySQL提示： Another MySQL daemon already running with the same unix socket

解决方法：

            启动或重启mysql不成功,提示:Another MySQL daemon already running with the same unix socket

出现此问题往往是上次mysql意外关闭造成的.最简便的解决方法就是找到mysql.sock文件删除掉,再重新启动mysqld即可成功.

查找

updatedb

locate mysql.sock

 

 

完全卸载MYSQL

 

01、检测MySQL存在与否

rpm -qa | grep mysql

2、关闭MySQL服务

ss -ln | grep 3306  #查看是否开启MySQL

/etc/init.d/mysqld stop   或  service mysqld stop

3、查看安装文件目录

卸载RPM

yum remove mysql mysql-server mysql-libs

find / -name mysql

rm -rf   xxx

04、删除mysql用户

userdel -r mysql

 

 

问题描述：缺少这个共享库 libmysqlclient.so.16  可能是丢失库文件或库文件的链接文件丢失

[root@upday mysql]# mysql
mysql: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory
[root@upday mysql]# service mysqld start
/usr/bin/mysqladmin: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory
Cannot check for MySQL Daemon startup because of mysqladmin failure.
Starting mysqld:                                           [FAILED]

 解决方法：

yum remove mysql-libs   #卸载

yum install -y mysql-libs   #在安装

 

问题描述：丢失mysql.hosts文件

问题解决：

查看日志

cat /etc/my.cnf  #查看日志存放的位置

tail  /var/log/mysqld.log

[root@upday mysql]# tail /var/log/mysqld.log
160912 10:54:29 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
160912 10:54:29 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
160912 10:54:43 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist
160912 10:54:43 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
160912 10:54:43  InnoDB: Initializing buffer pool, size = 8.0M
160912 10:54:43  InnoDB: Completed initialization of buffer pool
160912 10:54:43  InnoDB: Started; log sequence number 0 44233
160912 10:54:43 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
160912 10:54:43 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

从日志中看出需要初始化数据库

mysql_install_db

[root@upday mysql]# mysql_install_db 
Installing MySQL system tables...
OK
Filling help tables...
OK

To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h upday password 'new-password'

Alternatively you can run:
/usr/bin/mysql_secure_installation

which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.

See the manual for more instructions.

You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &

You can test the MySQL daemon with mysql-test-run.pl
cd /usr/mysql-test ; perl mysql-test-run.pl

Please report any problems with the /usr/bin/mysqlbug script!

设置MySQL密码
mysqladmin  -u root  password '123123'

登录MySQL

mysql -u root -p

 曾经的回忆

引用

http://www.cnblogs.com/kerrycode/p/4364465.html

http://www.cnblogs.com/ayanmw/p/3434028.html
http://www.cnblogs.com/ylqmf/archive/2011/10/17/2215726.html

 

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