问题出现：

[root@bogon ~]# yum -y install screen

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

 * base: mirror.bit.edu.cn

 * extras: mirror.bit.edu.cn

 * updates: mirror.bit.edu.cn

Error: database disk image is malformed

解决办法：

[root@bogon ~]# yum clean dbcache

Loaded plugins: fastestmirror

Cleaning repos: base extras updates

10 sqlite files removed

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解决 yum Error: database disk image is malformed