Processing a Data Set with Improved Control Interval Access

To process a data set with improved control interval access, a request must be:

Defined by a single RPL (VSAM ignores the NXTRPL parameter).
A direct GET, GET for update, or PUT for update (no POINT, no processing empty data sets). A RRDS with slots formatted is considered not to be empty, even if no slot contains a record.
Synchronous (no CHECK, no ENDREQ).

To release exclusive control after a GET for update, you must issue a PUT for update, a GET without update, or a GET for update for a different control interval.

With improved control interval access, the following assumptions are in effect for VSAM (with no checking):

An RPL whose ACB has MACRF=ICI has OPTCD=(CNV, DIR, SYN).
A PUT is for update (RPL OPTCD=UPD).
Your buffer length (specified in RPL AREALEN=number) is correct.

Because VSAM does not check these parameters, you should debug your program with ACB MACRF=NCI, then change to ICI.

With improved control interval access, VSAM does not take JRNAD exits and does not keep statistics (which are normally available through SHOWCB).