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centos提示database disk image is malformed解决方法

在执行yum更新，即运行 yum update 命令时，提示以下错误：

Error:database disk image is malformed

估计是由于yum的原数据损坏导致的，与rpm的数据库损坏类似，前者会导致更新不能正常执行，后者会导致安装失败并出现乱码，前者的解决参见yum更新和rpm安装包问题(rpmdb: PANIC: Invalid argument)，后者的错误可以通过一下方法解决：
终端，依次输入：
1.) yum clean metadata
2.) yum clean dbcache
3.) yum makecache
即先删除原数据和数据库缓存，然后重建之，问题即可解决

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