摘要：
问题：使用如下命令从头重建yum的库，但是仍然出现错误：[root@centos-74 ~]# yum clean all
...
Cleaning up Everything
Cleaning up list of fastest mirrors
[root@centos-74 ~]# rm -f /var/lib/rpm/__db*
[root@centos-74 ~]# rpm --rebuilddb
[root@centos-74 ~]# yum clean metadata
Loaded plugins: fastestmirror
...
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