centos 系统使用过程中的 FQA

使用yum报错 rpmdb open failed，解决办法如下

## 报错信息
[root@localhost ~]# yum install lrzsz 
error: rpmdb: BDB0113 Thread/process 45609/140591124904000 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，重建rpmdb后，再使用yum 安装程序
    rpm --rebuilddb