Making online changes for DEDBs

In the IMS DB/DC and DBCTL environments, you can make both database-level and area-level changes to Fast Path data entry databases (DEDBs).

A database-level change affects the structure of the DEDB, and includes such changes as adding or deleting an area, adding a segment type, or changing the randomizer routines. An area-level change involves increasing or decreasing the size of an area, including the overflow portions (IOVF and DOVF) and the control interval (CI) size.

A database-level change requires you to stop all areas of the DEDB. An area-level change requires you to stop the area using either the /DBRECOVERY AREA command.

IFP and MPP regions that access the changed DEDBs do not need to be stopped during the online change.

Related reading:  For more information about adding, modifying, or deleting DEDBs online, see IMS Version 15.2 Database Administration.