Pathway/iTS System Management Manual (G06.24+)

HP NonStop Pathway/iTS System Management Manual—426748-002
E-1
E Setting TMF Parameters
When you are configuring and controlling a Pathway application that uses TMF,
consider the following three basic questions:
•
How do the settings you specify for the TMF parameter of the SET TERM and SET
PROGRAM commands affect SCREEN COBOL SEND statements?
•
How is the TCP checkpointing strategy affected by the settings you specify for the
TMF parameter of the SET SERVER command? (For more information about the
SET SERVER command beyond that presented in this appendix, see the TS/MP
System Management Manual).
•
What problems are caused by using the TMF OFF option of the SET TERM or SET
PROGRAM commands as a switch to turn TMF off for a requester that is
communicating with servers running under the TMF software?
Addressing these questions helps ensure the consistency of the database and helps
you to improve the reliability and performance of the applications that use the
database.
SET TERM and SET PROGRAM Commands
and TMF
The SET TERM and SET PROGRAM commands each contain a TMF parameter with
an ON or OFF option:
•
TMF ON—The TCP invokes the corresponding operating system procedure for
any TMF statement issued from a SCREEN COBOL program. ON is the default
setting whether or not the TMF software is running.
•
TMF OFF—The TCP does not invoke the corresponding operating system
procedure for any TMF statement issued from a SCREEN COBOL program.
Instead, the TMF statement appears (to the SCREEN COBOL program) to
complete successfully and the program can continue to execute.
For most Pathway applications, you should use the default parameter settings, whether
or not the TMF software is running.
Effect of TMF Parameters in PATHCOM on SCREEN COBOL
SEND Operations
Figure E-1 on page E-3 lists how the various combinations of settings of the TMF
parameter in the PATHCOM SET SERVER, SET TERM, and SET PROGRAM