Increased number of areas for Fast Path DEDBs

Before this enhancement, Fast Path Data Entry Databases (DEDBs) allowed up to 2048 areas per database. However, you can have up to 9999 areas if you apply APAR PH12671 on IMS 15.1.

The maximum size of a DEDB area is 4 GB. The maximum number of areas per database is increased from 2048 to 9999, making the maximum size of a DEDB database 39996 GB (40 TB).

You can manage larger workloads by creating DEDBs that are 5 times larger than in previous versions of IMS.

After you apply PTFs UI78774 and UI78775 for APAR PH12671 on IMS 15.1, you can enable this enhancement by using either of the following methods:
  • Specify DEDBGT2K=Y in the FASTPATH section in the DFSDFxxx member. (The default is DEDBGT2K=N.)
  • Issue the following UPDATE IMSFUNC type-2 command:
    UPDATE IMSFUNC NAME(DEDBGT2K) SET(ENABLED(Y))

Changes to troubleshooting for IMS

For a list of the messages and codes that are new or changed for this enhancement, see the IMS messages and codes row in the table in Documentation changes.

For a complete list of all of the new, changed, and deleted messages, and abend codes in IMS 15.5, see Message and code changes in IMS 15.5.

Documentation changes

The following table lists the publications that contain new or changed topics for the New function name enhancement. Publications that are not impacted by this enhancement are not included in the table.

Table 1. Links to topics that have new or changed content for this enhancement
Publication Links to topics
Release planning
Application Programming
Commands, Volume 2: IMS Commands N-V
Database Administration
IMS messages and codes
System definition