CentOS 7 | Yum update – recovery database
mv /var/lib/rpm/\_\_db\* /tmp/ rpm --rebuilddb yum clean all
mv /var/lib/rpm/__db* /tmp/rpm --rebuilddbyum clean all
mv /var/lib/rpm/\_\_db\* /tmp/ rpm --rebuilddb yum clean all
mv /var/lib/rpm/__db* /tmp/rpm --rebuilddbyum clean all