Replacing Records in a VSAM File

   To replace records in a VSAM file, use REWRITE in a file that you have

   opened for I-O.  If you attempt to use REWRITE on a file that is not

   opened I-O, the record is not rewritten and the status key is set to 49.

   You should check the file status key after each REWRITE statement.

   °   For files accessed sequentially, you must read the record before you

       issue the REWRITE statement.

   °   For sequential files, the length of the record you rewrite must be the

       same as the length of the original record.

   °   For indexed files, you can change the length of the record you

       rewrite.

   °   For variable-length relative files, you can change the length of the

       record you rewrite.

   To replace records randomly or dynamically, the record to be rewritten

   need not be read by the COBOL program.  Instead, to position the record

   you want to update:

   °   For indexed files, move the record key to the RECORD KEY data item,

       and then issue the REWRITE.

   °   For relative files, move the relative record number to the RELATIVE

       KEY data item, and then issue the REWRITE.