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 database in /var/lib/rpm

Just proceed the codes below:

sudo mv /var/lib/rpm/__db* /tmp/
sudo rpm --rebuilddb
sudo yum clean all
sudo yum repolist

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My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. Nikola Tesla