Recurring corruption of rpmdb on RHEL 6

Issue

• I have some systems that repeatedly have problems with the RPM database. I can fix it by deleting the DB files under /var/lib/rpm and then rebuilding the DB but the problem returns within a day or two.

# rpm -qa
rpmdb: Thread/process 17173/140533482657696 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
rpmdb: Thread/process 17173/140533482657696 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 database in /var/lib/rpm

• I successfully repair using "rm -f /var/lib/rpm/__db*;rpm --rebuilddb" but issue keeps returning.