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Benifit of VB datasets over FB


 
IBM Mainframe Forums -> COBOL Programming
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Kmr.deepakcs

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Joined: 11 Oct 2013
Posts: 37
Location: India

PostPosted: Mon Oct 28, 2013 10:35 pm
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Dear Experts.

I have one question.
we know mainframe have fb and vb dataset. But my question is that what is the benifits of vb over fb.
How we decide whether we use fb dataset or vb dataset.
I am waiting for your valuable replies....



Regards:
Deepak kumar
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19251
Location: Inside the Matrix

PostPosted: Mon Oct 28, 2013 11:50 pm
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Hello,

FB or VB shouild be decided at design time - not by the programmer.

The biggest advantage of VB files is space savings which translates to less cost of storage and less processing overhead.

One of the files a vendor sends to our system each month is several hundred giga-byte VB. The first thing we do is copy this to FB and save between 40 and 45% of the space. The file has several formats and only one uses the longest length.
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8568
Location: Dubuque, Iowa, USA

PostPosted: Mon Oct 28, 2013 11:53 pm
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Many times, the data will determine whether to use FB or VB. For example, I worked (many years ago) on an application where we were tracking job histories for employees. Since an employee could work at different jobs during his / her career, it made since to have the file as VB with a varying number of job histories.

VB data sets may -- or may not -- require less space than an FB data set. These days, there's not a lot of difference to the system in using VB or FB data so application requirements should drive the choice.
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