配置yum后，使用yum list命令，由于运行速度比较慢，就强制停止了，下次运行yum命令报错：
rpmdb: Thread/process 2407/3079034560 failed: Thread died in Berkeley DB library
error: db4 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db3 – (-30974)
error: cannot open Packages database in /var/lib/rpm
/usr/lib/python2.6/site-packages/yum/config.py:884: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6
raise Errors.YumBaseError(“Error: ” + e.message)
CRITICAL:yum.main:
Error: rpmdb open failed
[root@lichenchao ~]#rm /var/lib/rpm/__db*
rm: remove regular empty file __db.000'? y
rm: remove regular file __db.001′? y
rm: remove regular file __db.002'? y
rm: remove regular file __db.003′? y
rm: remove regular file __db.004'? y