Using the ASAM services through GSAM replacement

This section describes the ASAM services that are available through GSAM replacement and summarizes the requirements for implementing ASAM services through GSAM replacement. GSAM replacement is provided with AR/CTL for IMS. It is for use in IMS and IMS compatible application programs.

Note

If an IMS program uses a program option member that contains any data set option members specifying sequential interception, local VSAM access, or remote VSAM access, AR/CTL forces the use of GSAM replacement.

To use GSAM replacement, the application program issues IMS format GSAM calls. These calls are identical to IMS GSAM calls; if the program already uses GSAM calls, no change is necessary.

The following table summarizes information about the IMS format calls that an IMS or IMS compatible application program can issue to request ASAM support.

GSAM replacement ASAM call summary

Function code

Description

Reference

CLSE

Explicitly close an ASAM data set.

GN

Retrieve the next sequential record from an ASAM data set.

GU

Retrieve a unique record from an ASAM data set, as identified by the RSA.

ISRT

Insert a segment in an ASAM data set.

OPEN

Explicitly open an ASAM data set.

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