??????????
????????????mysql???????п???????????????????????mysql??????????????????????/usr/local/mysql/(????????????lamp?????????????mysql)?????????????????з???/usr/local/mysql???????????????????????????????mysql???????????????mount??/app?????????????linux?μ?ln -s????
????OK ???濪??????(?:???2?????????1?????????????????????sql???)??
????1. service mysqld stop
????2. ??/app ??????????mysqldir : mkdir mysqldir #???·????????mysqldir??
????3. cd /usr/local/mysql && cp -r /app/mysqldir ?????????????mysqldir??
????4. rm -rf mysql  //????????????????
????5 ln -s /app/mysqldir mysql
????6. service mysqld start
??????????????????е?6?????????mysql???????????′???:
????Starting MySQL. ERROR! The server quit without updating PID file (/usr/local/mysql/data/AY13121220352352963dZ.pid).
????????service mysqld status?????????????:
????ERROR! MySQL is not running?? but lock file (/var/lock/subsys/mysql) exists
????ok ?????????ú????????????????????????????:
????1. chown -R mysql:mysql /app/mysqldir #????????????mysql???????
????2. rm -f /var/lock/subsys/mysql
?????????service mysqld start ?????