yum 错误 TypeError: rpmdb open failed

自动更新错误，internal error。
用 yum，提示错误：
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rpmdb: Thread/process 28879/3086964416 failed: Thread died in Berkeley DB library
error: db4 error(-30975) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db3 - (-30975)
error: cannot open Packages database in /var/lib/rpm
Traceback (most recent call last):
File "/usr/bin/yum", line 29, in
    yummain.user_main(sys.argv[1:], exit_code=True)
File "/usr/share/yum-cli/yummain.py", line 229, in user_main
    errcode = main(args)
File "/usr/share/yum-cli/yummain.py", line 84, in main
    base.getOptionsConfig(args)
File "/usr/share/yum-cli/cli.py", line 184, in getOptionsConfig
    enabled_plugins=self.optparser._splitArg(opts.enableplugins))
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 192, in _getConfig
    self._conf = config.readMainConfig(startupconf)
File "/usr/lib/python2.5/site-packages/yum/config.py", line 774, in readMainConfig
    yumvars['releasever'] = _getsysver(startupconf.installroot, startupconf.distroverpkg)
File "/usr/lib/python2.5/site-packages/yum/config.py", line 844, in _getsysver
    idx = ts.dbMatch('provides', distroverpkg)
TypeError: rpmdb open failed
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yum 错误TypeError: rpmdb open failed
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解决办法
是因为RPM数据库出现损坏导致的，它导致所有的软件的升级、安装甚至是删除都会出现问题，终端出现乱码，YUMEX也用不成，RPM命令也用不成。原因是RPM数据库被破坏，解决方法如下：
$ su            切换到root权限
# cd /var/lib/rpm/
# for i in `ls | grep 'db.'`;do mv $i $i.bak;done
# rpm --rebuilddb     重建该数据库
# yum clean all

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