ILE COBOL Programmer's Guide
If you have already opened a file through another program in your routing
step, your ILE COBOL program can use the same Open Data Path (ODP) to access
the file.
- Note:
- A job usually contains only one routing step. Routing steps are
described in the DB2 Universal Database for AS/400 section of the
Database and File Systems category in the iSeries 400
Information Center at this Web site - http://publib.boulder.ibm.com/pubs/html/as400/infocenter.htm.
The following rules apply to shared ODPs:
- You must specify SHARE(*YES) in the command that creates the file
(CRTxxxF), in a change command (CHGxxxF), or in an override (OVRxxxF) command
for the file.
-
Once a file with a shared ODP has been opened for the first time by a program
and remains open, subsequent shared OPEN operations within the same routing
step run faster than standard OPEN operations. The speed of other I/O
operations is not affected.
- Your use of the file within your different programs should be
consistent. Other programs using the same shared file will affect the
current file position when they perform I/O operations on the file.
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