A Post-Migration cleanup script will be provided for your DBA's to run after the migration is complete and confirmed successful. This cleanup script should only be run once the last step of the Migrate S21 Tool has been completed and a message appears regarding the cleanup script. When run, this database cleanup script will remove the temporary/scratch tables that were created solely for the purpose of the v21 Migration.
It is also recommended at this time that DBA's check for any tables with the suffix "_OLD_xx". These tables are remnants of previous migrations and can be safely deleted, although leaving these tables in the database will not harm anything.
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