Data sets and file processing

GDDM V3R2 Base Application Programming Guide

Data sets and file processing

GDDM V3R2 Base Application Programming Guide
SC33-0867-01

When running under IMS, GDDM uses two types of file processing:

QSAM (Queued Sequential Access Method) is used to write data to sequential output destinations when certain trace functions are requested using the FSTRCE call. For information on the use of FSTRCE, see the GDDM Diagnosis book.
DL/I is used to read and write information into the two types of DL/I database used by GDDM.

In the first type, GDDM refers to the file using a ddname. The default value of this name is taken from the IMSTRCE option in GDDM's external defaults. (For more information, see the table of external defaults for IMS in the GDDM Base Application Programming Reference book.) If output is to be created from this file, the dependent region JCL must be modified to include a DD statement for it. The data set type and DCB characteristics should be as shown in Table 16 in topic D.7.

The Interactive Chart Utility (part of GDDM-PGF) includes a directory function that supports list, delete, and copy operations on GDDM DL/I objects such as symbol sets and pictures.

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