尝试了许多办法仍然无法解决数据库无法启动的错误，菜鸟盼望各位大婶能够指点迷津。。。。错误日志如下
140313 15:22:36 mysqld_safe Starting mysqld.bin daemon with databases from /opt/mediawiki-1.21.2-1/mysql/data
140313 15:22:36 [Note] Plugin 'FEDERATED' is disabled.
/opt/mediawiki-1.21.2-1/mysql/bin/mysqld.bin: Can't find file: './mysql/plugin.frm' (errno: 13)
140313 15:22:36 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
140313 15:22:36 InnoDB: The InnoDB memory heap is disabled
140313 15:22:36 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
140313 15:22:36 InnoDB: Compressed tables use zlib 1.2.3
140313 15:22:36 InnoDB: Using Linux native AIO
/opt/mediawiki-1.21.2-1/mysql/bin/mysqld.bin: Can't create/write to file '/opt/mediawiki-1.21.2-1/mysql/tmp/ibS1Nhnt' (Errcode: 13)
140313 15:22:36 InnoDB: Error: unable to create temporary file; errno: 13
140313 15:22:36 [ERROR] Plugin 'InnoDB' init function returned error.
140313 15:22:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140313 15:22:36 [ERROR] Unknown/unsupported storage engine: InnoDB
140313 15:22:36 [ERROR] Aborting
140313 15:22:36 [Note] /opt/mediawiki-1.21.2-1/mysql/bin/mysqld.bin: Shutdown complete
140313 15:22:36 mysqld_safe mysqld from pid file /opt/mediawiki-1.21.2-1/mysql/data/mysqld.pid ended
