有时候在安装完数据库并初始化的时候会出现如下错误：
root@localhost mysql-5.5.19]# bash scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/home/webserver/mysqldata/
installing mysql system tables...
120330 16:19:42 [error] unknown collation: 'utf8-general_ci'
120330 16:19:42 [error] aborting
120330 16:19:42 [note] /usr/local/mysql/bin/mysqld: shutdown complete
installation of system tables failed!  examine the logs in
/home/webserver/mysqldata/ for more information
造成这种错误原因是在配置参数时utf8-general_ci写错了，应该是utf8_general_ci,
如果不想重新安装数据库那就在my.cnf文件中[mysqld]下面增加一行：
character_set_server=utf8