YUM and DNF updates are sensitive to interruption. Meaning, that when interrupted, there is a strong change that the database will become corrupted and the next yum attempt will result with a DB_RUNRECOVERY Fatal error. As scary as that may appear, it resolution is simple. Sensitive as it may be, it is quite resilient.
$ mv /var/lib/rpm/__db* /tmp/ $ rpm --rebuilddb $ yum clean all