COBOL Manual for TNS/E Programs (H06.03+)

Environment Division
HP COBOL Manual for TNS/E Programs—520347-003
6-47
FILE-CONTROL Paragraph
DYNAMIC
makes the access mode of the file dynamic. That means the records of the file
are accessible by either sequential or random access; you can position the file
with START to a certain key value and read or write sequentially from there.
The default access mode is sequential.
RECORD KEY clause
rec-key
is an alphanumeric or unsigned numeric data item defined in the record
description entry for the file. It is the prime key for accessing records within the
file. If the file was created with FUP or CREATE, the reckey size and location
must agree with the size and location of the prime key established by FUP or
CREATE.
All records in the file are ranked in ascending order of the reckey value,
which must be unique for each record.
ALTERNATE RECORD KEY clause
makes alt-key an alternate record key.
alt-key
is an alphanumeric or unsigned numeric data item declared in the record
description entry of the file and is used to gain access to records within the file.
The alt-key size and location must agree with the size and location of the
alternate key within the file, as defined when the alternate key file was
established by the operating system File Utility Program (FUP). (For
information about FUP, see the File Utility Program (FUP) Reference Manual.)
DUPLICATES
means that alternate key values are not necessarily unique.
RECORD
KEY IS
reckey
VST054.vsd
RECORD
KEY
IS
alt-key
WITH
DUPLICATES
ALTERNATE
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