groupadd mysql  
    useradd -r -g mysql mysql  

    tar -zxvf mysql-5.5.12.tar.gz 
    cd mysql-5.5.12 
   cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DMYSQL_UNIX_ADDR=/data/mysql/mysql.sock -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS:STRING=utf8,gbk -DWITH_MYISAM_STORAGE_ENGINE=1 -DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_MEMORY_STORAGE_ENGINE=1 -DWITH_READLINE=1 -DENABLED_LOCAL_INFILE=1 -DMYSQL_DATADIR=/data/mysql -DMYSQL_USER=mysql -DMYSQL_TCP_PORT=3306  
    make  
    make install  

cp support-files/my-medium.cnf /etc/my.cnf     #如果你的机器的内存教大，可以复制Myhuge.cnf文件

chmod 755 scripts/mysql_install_db

scripts/mysql_install_db  --user=mysql  --basedir=/usr/local/mysql --datadir=/data/mysql/    ##初始化数据库

cp support-files/mysql.server /etc/init.d/mysql   #设置开机启动mysql

chmod 755 /etc/init.d/mysql

chkconfig mysql on     #开机启动

echo ‘export PATH=/usr/local/mysql/bin:$PATH‘ >> /etc/profile        #将mysql的安装路径加入PATH中，方便启动mysql（重启生效）

/etc/init.d/mysql start     #启动mysql

/usr/local/mysql/bin/mysql -u root

SET PASSWORD FOR ‘root‘@‘localhost‘=PASSWORD(‘123456‘);