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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