A lot of .old files are seen in the mysql data directory

Document ID : KB000124095
Last Modified Date : 03/01/2019
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Issue:
Disk space is being used up by a lot of .old files present in the $SPECROOT/mysql/data directory.
Resolution:
These files are created during upgrades to preserve the database.
If the upgrade is successful and Report Manager is working normally - these files can be removed.