错误：[root@test ~]# yum makecache
error: rpmdb: BDB0113 Thread/process 18967/139716328294400 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：rpm数据库损坏。
解决方法（重新构建rpm数据库）：
[root@test ~]# cd /var/lib/rpm
[root@test rpm]# ls
Basenames __db.001 __db.003 Group Name Packages Requirename Sigmd5
Conflictname __db.002 Dirnames Installtid Obsoletename Providename Sha1header Triggername
[root@test rpm]# rm -rf __db.*
[root@test rpm]# rpm --rebuilddb