Enterprise COBOL for z/OS, Version 4.2, Programming Guide

Identify VSAM ESDS files in a COBOL program with the ORGANIZATION IS SEQUENTIAL clause.
You can access (read or write) records in sequential files only sequentially.

After you place a record in the file, you cannot shorten, lengthen, or delete it.
However, you can update (REWRITE) a record if the length does not change.
New records are added at the end of the file.

The following example shows typical FILE-CONTROL entries for a VSAM sequential file (ESDS):

   SELECT S-FILE
          ASSIGN TO SEQUENTIAL-AS-FILE
          ORGANIZATION IS SEQUENTIAL
          ACCESS       IS SEQUENTIAL
          FILE STATUS  IS FSTAT-CODE VSAM-CODE.

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