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rambabu
Currently Banned
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Joined: 18 Apr 2005
Posts: 67
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| What is the difference between dummy and temporary datasets? Can we pass the temporary dataset to another step? |
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priya
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Joined: 24 Jul 2003
Posts: 568
Location: Bangalore
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Dummy dataset doesn't occupy memory, while Temporary dataset occupies memory. (they are created and deleted within the job scope)
Yes, You can pass Temporary datasets to another steps. |
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mmwife
Super Moderator
Joined: 30 May 2003
Posts: 1592
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When a dummy I/P ds is read an immediate EOF occurs.
When a dummy O/P ds is written to, no data is transferred.
If you concatenate dummy ds in other than the last position in the concat, the 1st read of the dummy ds produces an EOF, even if there are real ds following in the concat. |
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andycool
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Joined: 12 Apr 2005
Posts: 64
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Can anyone let me know the use of a dummy dataset.
Please explain creating some situation.
Regards, |
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vijayamadhuri
Active User
Joined: 06 Apr 2005
Posts: 180
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The dummy dataset is coded on the DD ststement to test the execution of the pgm without actually reading or writing into the dataset.It basically
simulates the presence of the file even without it actually existing.
//ddname DD DUMMY
or
DD DSN=nullfile
if the DUMMY FILE IS READ the O.S sends an EOF indicator to the pgm being executed.This will result the pgm to execute based on it's logic without actually reading any data.
If write is requested the file being imaginary is simply ignored. |
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