IBM AS/400 manual Files For, Using, Specifying, Concepts, Commitment

Using

Commitment Control

The

default

scope

for a commitment definition is to

the

activation

g

program

issuing

the

STRCMTCTL

command,

that

is,

at

the

activation

group

le

Only

programs

that

run

within

that

activation

group

will

use

that

commit

nition.

OPM

programs

will

use

the

*DFTACTGRP

commitment

definition.

ILE

pro-

grams

will use the activation group they are associated with.

You

specify

the

scope for a commitment definition

on

the

commitment

s

(CMTSCOPE)

parameter

of

the

STRCMTCTL

command.

For

further

information

on

the

commitment control scope within ILE, refer to "Data

Management

Scopi

ILE

Concepts, and

also Datathe

Management manual.

Specifying

Files

for

Commitment

Control

To indicate that a DISK

file

is

to

run

under

commitment

control,

enter

COMMIT

in

the

keyword

field

of

the

file

description

specification.

When

a

program

specifies

commitment

control

for

a

file,

the

specific

only

to

the

input

and output operations made by this program

for

th

ment

control

does

not

apply

to

operations

other

than

input

and

output

does

not apply

to

files

that do not have commitment

control

specified

program

doing

the

input

or

output

operation.

When

more

than

one

program accesses a file as a shared file, all

programs

must

specify

the

file

to

be

under

commitment

control.

Using the

COMMIT

Operation

The

COMMIT operation tells the system that you have

completed

a

group

changes

to

the

files

under

commitment

control.

The

ROLBK

operation

elimi

the

current

group

of changes to the files under commitment

control.

F

on

how

to

specify

these

operation

codes and

what

each

operation

d

ILE

RPG for AS/400 Reference.

If

the

system

fails,

it

implicitly

issues

a

ROLBK

operation.

You

ca

tity

of

the

last

successfully

completed

group

of

changes

using

the

in factor 1 of the COMMIT

operation

code,

and

the

notify-object

yo

STRCMTCTL

command.

At the end of an

activation group or job, or when

you

issue

the

E

command,

the

OS/400

system

issues

an

implicit

ROLBK,

which

eliminates

any

changes

since

the

last

ROLBK

or

COMMIT

operation

that

you

issued.

To

that

all

your file operations

have

effect,

issue

a

COMMIT

operation

an

activation

group

or

job

operating

under

commitment

control.

The

OPEN

operation

permits

input

and

output

operations

to

be

made

to

the

CLOSE

operation

stops input and output operations from being made

However, the OPEN and CLOSE operations do not affect

the

COMMIT

and

RO

operations.

A

COMMIT

or ROLBK operation affects a file, even after t

been

closed.

For

example,

your

program

may

include

the

following

step

1. Issue COMMIT (for files already opened under commitment control).

2. Open a file specified for commitment control.

3. Perform some input and output operations to this file.

4. Close the file.

Chapter 16. Accessing Database 309Files