IDA019L1

IDA019L1 is the Main Record Management module for VSAM. It includes 33 modules. VSAM Record Management is responsible for maintaining the logical records for all three types of VSAM data sets. It groups logical records into entities called control intervals, which are then grouped into control areas.

IDA019L1 is a load module that is loaded into the pageable supervisor or link-pack area by nucleus initialization program (NIP) at initial program load (IPL).

Reference Sources

Lowe, Doug, VSAM, Access Method Services and application programming, Mike Murach & Associates, US 1986.

OS/VS2 Independent Component: Virtual Storage Access Method (VSAM) Logic, SY26- 3846.