如果yum进程没有正常结束被kill掉了，那么就有可能造成yum无法正常使用，即rpm数据库损坏。

具体报错内容如下：
error: rpmdb: BDB0113 Thread/process 26513/139917818624064 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

|---------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 | error: rpmdb: BDB0113 Thread/process 26513/139917818624064 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 |

解决办法，重新rebuild，修复rpm数据库：
cd /var/lib/rpm rm -f __db* rpm --rebuilddb

|-------|----------------------------------------------| | 1 2 3 | cd /var/lib/rpm rm -f __db* rpm --rebuilddb |

此时再执行yum命令就正常了