Recover RPM DB from a corrupted RPM database in RHEL 7

Recover RPM DB from a corrupted RPM database in RHEL 7
Situation:
Although everything is done to ensure that your RPM databases are intact, your RPM database may become corrupt and unuseable. This happens mainly if the filesystem on which the rpm db resides is suddenly inaccessible (full, read-only, reboot, or so on).

Solution:
1.Start by creating a backup of your corrupt rpm db, as follows:
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