centos yum 无法使用

错误提示：

error: rpmdb: BDB0113 Thread/process 30548/140268234049344 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

首先清除缓存，（不放心也可以备份一下几个__db文件再删除）之后再重建就可以了

# rm -f /var/lib/rpm/__db*
# rpm --rebuilddb