Fix rpmdb: Thread died in Berkeley DB library

Issue

If you see rpmdb errors during package management (during yum/rpm operations), like this:

rpmdb: Thread/process 277623/140429100390144 failed: Thread died in Berkeley DB library
error: db3 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
CRITICAL:yum.verbose.cli.yumcompletets:Yum Error: Error: rpmdb open failed

It means that the RPM database is corrupted.

A similar error can be triggered in LVE Manager Installation Wizard

Environment

CloudLinux OS 6(h)/7(h)/8

Solution

Please follow these steps to backup and rebuild the rpmdb database:

mkdir /var/lib/rpm/backup 
cp -a /var/lib/rpm/__db* /var/lib/rpm/backup/ 
rm -f /var/lib/rpm/__db.[0-9][0-9]* 
rpm --quiet -qa 
rpm --rebuilddb 
yum clean all

If the issue reoccurs, please follow the article:
https://access.redhat.com/solutions/3330211