Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Difference between Tape data set and Dasd Data set

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming
View previous topic :: :: View next topic  
Author Message
k.pavankumar

New User


Joined: 22 May 2006
Posts: 8

PostPosted: Sat Jun 24, 2006 3:40 pm    Post subject: Difference between Tape data set and Dasd Data set
Reply with quote

Hi People,

Could any body please Explain me what is the exact difference between a Tape data set and a DASD Dataset.

What is the purpose of those 2 categories, in which situation we will use which datasets.

what are the scenarios or steps that will be taken when a job abends that is pointing to a Tape dataset and also same scenario for the DASD dataset.

Advance Thanks
K pavan kumar icon_biggrin.gif
Back to top
View user's profile Send private message

Manojudha

New User


Joined: 13 Jul 2005
Posts: 13

PostPosted: Tue Jun 27, 2006 4:27 pm    Post subject: Re: Difference between Tape data set and Dasd Data set
Reply with quote

A DASD dataset is a dataset that is stored in the System Disk mean the Mainframe server.

A tape dataset is a dataset that is stored in a tape. A tape is a device may be like a floppy wherein you can put in so much of data, back ups etc.

Usually as per my experience, tapes are used to take back ups of the datasets.

When you encounter some abend in tape, it could be due to various reasons. But it could be because the tape was not mounted.

Let me know if I answered your question.
Back to top
View user's profile Send private message
k.pavankumar

New User


Joined: 22 May 2006
Posts: 8

PostPosted: Tue Jun 27, 2006 4:38 pm    Post subject: Re: Difference between Tape data set and Dasd Data set
Reply with quote

Hi Manojudha,

Thanks for your reply.

But I have another doubt relating to the Tape datasets.

In Production I have found that all the GDG Base are stored on the Tape.
My doubt is whether it is Compulsary to store the GDG Base on the Tape Data set or it is optional.

Please Reply

Advance Thanks! icon_biggrin.gif
Back to top
View user's profile Send private message
creator.abhishek

New User


Joined: 07 May 2006
Posts: 32
Location: Pune

PostPosted: Tue Jun 27, 2006 4:45 pm    Post subject:
Reply with quote

i think in any kind of development , first program is preapare n tested in dasd then it move to tape if necessary. m i rt?
Back to top
View user's profile Send private message
Manojudha

New User


Joined: 13 Jul 2005
Posts: 13

PostPosted: Tue Jun 27, 2006 7:52 pm    Post subject: Re: Difference between Tape data set and Dasd Data set
Reply with quote

Using DASD or Tape for Testing is user dependant. It is compulsory to do it in DASD. It is optional and is based on your requirement where you store it.

Regarding GDG bases again, creating in tape or dasd is optional.

Thanks
Manojudha
Back to top
View user's profile Send private message
parikshit123

Active User


Joined: 01 Jul 2005
Posts: 269
Location: India

PostPosted: Wed Jul 05, 2006 4:57 pm    Post subject:
Reply with quote

Hi,

I think that there is no concept like "tape datasets" and "DASD datasets".

Probably, you might like to call the datasets which are stored on tape or DASDs ...

Yes, there is a subtle difference between them.

First and foremore difference is that, Datasets stored on tape can only be processed sequentially. Whereas, datasets stored on DASDs may / may not be processed sequentially.
KSDS datasets can not be stored on tape.

Generally, tapes are used to take back up of the datasets as its a cheaper device as compared to DASDs.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts Replace values in the input data Vikas Maharnawar DFSORT/ICETOOL 10 Thu May 11, 2017 2:18 pm
No new posts Group Data based on a key Arun Raj DFSORT/ICETOOL 7 Thu Apr 27, 2017 11:29 pm
No new posts unload data from table with lob columns farhad_evan DB2 0 Sat Apr 22, 2017 1:32 pm
No new posts Length of Tape file Mohan Kothakota JCL & VSAM 9 Thu Apr 20, 2017 10:24 pm
No new posts SORT JSON type of data maxsubrat DFSORT/ICETOOL 8 Wed Apr 19, 2017 6:01 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us