执行yum命令的时候报如下错误：
error: rpmdb: BDB0113 Thread/process 1309432/139989604449152 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
Error: Error: rpmdb open failed
解决办法：
cd /var/lib/rpm
rm -rf __db*
rpm --rebuilddb
具体步骤如下图：
