IDA019RA

IDA019RA is a CSECT within load module IDA019RL. Module IDA019R1 (VSAM DECODE AND VALIDATE) invokes it for direct and skip-sequential GET requests in VSAM KSDS,ESDS files, and VSAM variable length RRDS files. IDA019RA locates the position of a desired data record in a control interval in the VSAM record management buffer. If the data set is key- sequenced (KSDS), control passes to IDA019RB (VSAM INDEX SEARCH), which searches the index to determine the relative byte address (RBA) of the data record's control interval (CI). IDA019RZ (VSAM BUFFER MANAGER INTERFACE) is then invoked to obtain the index record to search.

Reference Sources

MVS/Extended Architecture: Virtual Storage Access Method (VSAM) Logic, LY26- 3970.