https://www.ibm.com/docs/en/ims/15.1.0?topic=types-converting-database-from-hisam-hidam
IMS 15 - Database administration - Converting a database from HISAM to HIDAM
Converting a database from HISAM to HIDAM can be performed in a few steps; however, you need to perform a number of preliminary steps also.
database administrationimsconverting