Hello Dave,
The DBMT tool perform copy style compaction along with the other process such as
- runs copy-style compact operations
- purges deletion stubs
- expires soft deleted entries
- updates views
- reorganizes folders
- merges full-text indexes
- updates unread lists
- ensures that critical views are created for failover
Please refer the following HCL support link for detailed information about DBMT tool
I hope the above information will help in answering your concerns.
Thank you
Nishant Shendre