yum提示Error: rpmdb open failed错误的解决办法

centos系统使用yum命令安装软件包时候报错：

 error: rpmdb: BDB0113 Thread/process 2229/140657048729600 failed: BDB1507 Thread died in Berkeley DB library error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db5 -  (-30973) error: cannot open Packages database in /var/lib/rpm CRITICAL:yum.main: Error: rpmdb open failed

原因是RPM数据库被破坏，重建数据库后恢复正常：

 cd /var/lib/rpm/ for i in `ls | grep 'db.'`;do mv $i $i.bak;done rpm --rebuilddb yum clean all