https://www.ibm.com/docs/en/ims/15.3.0?topic=utilities-database-prereorganization-utility-dfsurpr0
IMS 15.3 - Database administration - Database Prereorganization utility (DFSURPR0)
The Database Prereorganization utility (DFSURPR0) runs before you load or reorganize databases that have secondary indexes or logical relationships.
database administrationimsutility