4.2.13 "COBOL Language Reference" IBM Library Server

X 4.2.13 LOCK MODE Clause (OS/2 VSAM Files Only)

X >_Host_> On OS/390 and VM, the LOCK MODE IS AUTOMATIC clause is invalid.
X <_Host_<

X >_Workstation_> The LOCK MODE IS AUTOMATIC clause is only supported by the
X VSAM file system running on OS/2.

X The LOCK MODE IS AUTOMATIC clause is treated as a comment on:

X AIX
X Windows
X OS/2 (with the exception of VSAM)

X For OS/2 VSAM files, record locking is not supported for files that reside
X on an OS/2 LAN server. Files residing on OS/2 LAN servers are opened
X shared read or exclusive write. <_Workstation_<

X The LOCK MODE clause specifies whether a file is in exclusive or shareable
X mode. A file in exclusive mode is open to one file connector only. A
X file in shareable mode is available to any number of file connectors that
X do not require exclusive mode.

X A file is in exclusive mode if the LOCK MODE clause is omitted (as long as
X the file is not opened for input).

X A file is in shareable mode when it is opened for input or when the LOCK
X MODE IS AUTOMATIC clause is specified and is supported.

X Do not specify the LOCK MODE IS AUTOMATIC clause if the file is specified
X in a USING or GIVING phrase of a SORT or MERGE statement.

X The WITH LOCK ON RECORD phrase is for documentation purposes only.

Subtopics:

4.2.13.1 Other Statements Affecting Record Locking

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X 4.2.13 LOCK MODE Clause (OS/2 VSAM Files Only)

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