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File access in IMSDC

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Jyothsna Reddy



Joined: 05 Aug 2008
Posts: 4
Location: India
Posted: Wed Aug 06, 2008 1:56 pm    Post subject: File access in IMSDC  
Hi
1. I have some sequential files being used in an IMS DC program.Please let me know how to find the physical file names for these.
and also one more question..
2. when i create MFS and DC program, where do i link MFS name with DC program. who does this and when.

Thanks,
Jyothsna
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Sandy Zimmer



Joined: 13 Jun 2007
Posts: 438
Location: Wilmington, DE
Posted: Wed Aug 06, 2008 7:35 pm    Post subject:  
1.) No - you don't. IMD DC cannot access physical sequential files. They are not defined to the IMS DC regions.

2.) In your MFS, you will see your DC transaction which is defined in an ACB gen.
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Jyothsna Reddy



Joined: 05 Aug 2008
Posts: 4
Location: India
Posted: Thu Aug 07, 2008 11:01 am    Post subject:  
Hi Sandy,

I went back to my program and checked it. i have file control statements in my program. see the below

FILE-CONTROL.
SELECT IS01 ASSIGN TO UT-S-K211JUN.
SELECT IS02 ASSIGN TO UT-S-TABJCL01.
SELECT OS01 ASSIGN TO UT-S-INTRDR.

i checked entry statement, its having IO-PCB and ALT-PCB.

Jyothsna
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Jyothsna Reddy



Joined: 05 Aug 2008
Posts: 4
Location: India
Posted: Thu Aug 07, 2008 11:03 am    Post subject:  
and also can you please tell me which statement in MFS will contain DC transaction.
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Sandy Zimmer



Joined: 13 Jun 2007
Posts: 438
Location: Wilmington, DE
Posted: Thu Aug 07, 2008 3:08 pm    Post subject:  
It is not a DC program. Is it a functioning program? Does your installation run BMP?
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Jyothsna Reddy



Joined: 05 Aug 2008
Posts: 4
Location: India
Posted: Fri Aug 08, 2008 9:43 am    Post subject:  
Hi Sandy,

My program is having io-pcb and alt-pcb in entry statement. with this i assume its a DC program. pls correct me if ia m wrong.

I am not sure whether BMP run during installation. h ow will i find this?

Please bear with my quesions (if it is too basic)

Thanks,
Jyothsna
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Sandy Zimmer



Joined: 13 Jun 2007
Posts: 438
Location: Wilmington, DE
Posted: Fri Aug 08, 2008 4:25 pm    Post subject:  
DC (MPP - message processing programs) do not and cannot have physical sequential files - they can only access IMS databases.

Take a look at the PSB. Also, there should be a file cross reference. Or you can search the JCL libraries for those file names and the name of your program. Look at the execute statement - it will tell you if it is BMP.

Even tho your entry statement calls those PCBs IO and ALT does not make it so.
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