今天在RED HAT 9上面安装了MYSQL，但是在service mysql start以后，查看service  mysql status的时候出现以下提示：

mysqld 已死，但是 subsys 被锁

我起初还看了日志文件，日志文件提示：

Cannot initialize InnoDB as 'innodb_data_file_path' is not set.
If you do not want to use transactional InnoDB tables, add a line
skip-innodb
to the [mysqld] section of init parameters in your my.cnf
or my.ini. If you want to use InnoDB tables, add to the [mysqld]
section, for example,
innodb_data_file_path = ibdata1:10M:autoextend
But to get good performance you should adjust for your hardware
the InnoDB startup options listed in section 2 at
http://www.innodb.com/ibman.html
060806 12:51:01  /usr/libexec/mysqld: Incorrect information in file: './mysql/host.frm'
060806 12:51:01  mysqld ended

我感觉日志文件好象不怎么对，说实话对于一个新手来说，我连.cnf文件在哪里都不知道，我后来在MYSQL的论坛里找到了解决方法，至于原理，我还没有漫漫体会，我把原版的英文发给大家看看：

1. Obviously the 'ole check the log file for anything nasty

cat /var/log/mysqld.log

2. Stop the service

service mysqld stop

3. Check to see if the service stopped, it might be calling the wrong pid.

ps aux | grep mysql

4. Kill any mysql process that might still be running.

kill -9 ??? ???

5. (*CAREFUL*) Remove/move/backup any databases from the data directory, only do this step if you need to.

rm -Rf /var/lib/mysql/*

6. Check your global options configuration file, should be similar to stevanbt's initial post.

cat /etc/my.cnf

7. Copy over one of the preconfigured 'sample' server-specific options file. Global (/etc/my.cnf) file has priority over server-specific file, but these have more options in them and have been tuned for a certain role.

cp /usr/share/doc/mysql-server-?.??.??/my-small.cnf /var/lib/mysql

8. Recreate the initial databases, this step is optional as the initscripts will do this anyway.

mysql_install_db

9. Check and set the runlevels for the service.

chkconfig --level 345 mysqld on
chkconfig --list mysqld

10. Start the service.

service mysqld start

11. Check the log file (step 1)

Thats just a basic step through check, most of you have probably already done this.

其实做到step 9问题都已经解决了

关键字：Mysql、subsys