这几天做mysql的脚本备份测试，在red hat linux 5.3下搭建mysql环境：
安装mysq后l第一次启动报错：
110712 17:17:04 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110712 17:17:04 [Note] Plugin 'FEDERATED' is disabled.
/usr/sbin/mysqld: Table 'mysql.plugin' doesn't exist
110712 17:17:04 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
InnoDB: The InnoDB memory heap is disabled
InnoDB: Mutexes and rw_locks use GCC atomic builtins
InnoDB: Compressed tables use zlib 1.2.3
google搜索解决办法：
执行 /usr/bin/mysql_install_db --user=mysql --datadir=/var/lib/mysql 重新安装了mysql的系统库 解决。
注：/var/lib/mysql为rpm包安装mysql默认的数据文件目录