4.2.8 "COBOL Language Reference" IBM Library Server

4.2.8 ACCESS MODE Clause

The ACCESS MODE clause defines the manner in which the records of the file are made available for processing. If the ACCESS MODE clause is not specified, sequential access is assumed.

X For sequentially accessed relative files, the ACCESS MODE clause does not
X have to precede the RELATIVE KEY clause.

ACCESS MODE IS SEQUENTIAL

Can be specified in all four formats.

Format 1--Sequential

Records in the file are accessed in the sequence established when the file is created or extended. Format 1 supports only sequential access.

Format 2--Indexed

Records in the file are accessed in the sequence of ascending record key values according to the collating sequence of the file.

Format 3--Relative

Records in the file are accessed in the ascending sequence of relative record numbers of existing records in the file.

X Format 4--Line Sequential (Workstation Only)

X >_Workstation_> Records in the file are accessed in the sequence
X established when the file is created or extended. Format 4
X supports only sequential access. <_Workstation_<

ACCESS MODE IS RANDOM

Can be specified in Formats 2 and 3 only.

Format 2--Indexed

The value placed in a record key data item specifies the record to be accessed.

Format 3--Relative

The value placed in a relative key data item specifies the record to be accessed.

ACCESS MODE IS DYNAMIC

Can be specified in Formats 2 and 3 only.

Format 2--Indexed

Records in the file can be accessed sequentially or randomly, depending on the form of the specific input-output statement used.

Format 3--Relative

Records in the file can be accessed sequentially or randomly, depending on the form of the specific input-output request.

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4.2.8 ACCESS MODE Clause

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