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Using Commitment Control
5. Issue ROLBK.
The changes made at step 3 are rolled back by the ROLBK operation at step 5,
even though the file has been closed at step 4. The ROLBK operation could be
issued from another program in the same activation group or job.
A program does not have to operate all its files under commitment control, and to
do so may adversely affect performance. The COMMIT and ROLBK operations
have no effect on files that are not under commitment control.
Note: When multiple devices are attached to an application program, and commit-
ment control is in effect for the files this program uses, the COMMIT or
ROLBK operations continue to work on a file basis and not by device. The
database may be updated with partially completed COMMIT blocks or
changes that other users have completed may be eliminated. It is your
responsibility to ensure this does not happen.
Example of Using Commitment Control
This example illustrates the specifications and CL commands required for a
program to operate under commitment control.
To prepare for using commitment control, you issue the following CL commands:
1. CRTJRNRCV JRNRCV (RECEIVER)
This command creates a journal receiver RECEIVER.
2. CRTJRN JRN(JOURNAL) JRNRCV(RECEIVER)
This command creates a journal JOURNAL and attaches the journal receiver
RECEIVER.
3. STRJRNPF FILE(MASTER TRANS) JRN(JOURNAL)
This command directs journal entries for the file MASTER and the file TRANS
to the journal JOURNAL.
In your program, you specify COMMIT for the file MASTER and the file TRANS:
310 ILE RPG for AS/400 Programmer's Guide