When using yum on CentOS, you might get something like Error: rpmdb open failed. A similar error like this can be shown:
yum clean all error: rpmdb: BDB0113 Thread/process 2921108/140151702521664 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:
This means that your yum repository is corrupted. To fix this, we need to clean out the local yum database:
mv /var/lib/rpm/__db* /tmp yum clean all
Now run the yum command again, e.g.:
yum update Loaded plugins: fastestmirror, rhnplugin This system is receiving updates from CLN. Determining fastest mirrors [...]
If all goes well, remove the old database:
rm -rf /tmp/__db*