Largest size for Datacom database files
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Largest size for Datacom database files


Article ID: 93149


Updated On:


Datacom Datacom/AD Datacom/DB


What is the largest or maximum file allocation size for a data or index area in Datacom?


Component : Datacom/AD

Component : Datacom/DB


When allocating files using the legacy EXCP method, each application database file is a standard sequential (PS) file, subject to the same rules as any other PS file.

As a DSNTYPE=BASIC type file, it is limited to 16 extents per volume, and no more than 65535 tracks on one volume. This file can be allocated on as many as 59 volumes if needed. If more than 65535 tracks are needed on a volume, allocating the file with DSNTYPE=LARGE will allow up to 16,777,215 tracks on a single volume.

Datacom does not support Extended Format files, but using DSNTYPE=LARGE should meet most application needs.

Additional Information

For more information about file allocations and limits, please see the IBM DFSMS Using Data Sets manual:

Also see the Datacom documentation section Datacom Database Limits Quick Reference.

As always, please contact Broadcom support for Datacom if you have further questions.