ILBOQIO
ILBOQIO is a COBOL routine that handles all requests for READ, WRITE, REWRITE, OPEN, and CLOSE verbs with QSAM files.
Hints
Significant CPU and wait time can result from excessive opens and closes of QSAM files. Typically, files are opened at the beginning of processing and closed when processing has finished. Excessive opens and closes might indicate that these operations are performed within a program looping structure. If this is the case, move the open/close outside the looping structure.
Reference Sources
IBM OS/VS COBOL Subroutine Library Program Logic, LY28-6425.