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 the UPDATE AREA STOP(ACCESS) 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 Database Administration.