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VSAM Datasets on TAPE


IBM Mainframe Forums -> DFSORT/ICETOOL
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bsng_surru

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Joined: 07 Mar 2005
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PostPosted: Tue Mar 08, 2005 8:30 am
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can we reside vsam datasets on tape?
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n.sinha

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Joined: 09 Mar 2005
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Location: Bangalore

PostPosted: Wed Mar 09, 2005 1:35 am
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Hi,

We can not create VSAM dataset on tape.
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bsng_surru

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PostPosted: Wed Mar 09, 2005 1:19 pm
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thanks a lot
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srividya.srinivasan

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Joined: 30 Mar 2005
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Location: Pune, India

PostPosted: Wed May 11, 2005 10:41 am
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Hi,


VSAM Datasets can be stored on tape.

They can retrived and also can be accessed from tape sequentially.


Do let em know in case u have any queries on this.


Regards,
Vidya[/b]
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mmwife

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Joined: 30 May 2003
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PostPosted: Sun May 15, 2005 8:55 pm
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Hi Vidya,

I think you're wrong. VSAM files are disk oriented files. You can back them up and restore them, but you cannot access them directly from tape as you can with flat file.

Think of what goes on when you access a VSAM file. The indexes can be separate files, as the data cluster is. When you access a record on a VSAM file the index is searched then the data is accessed. Tape is not designed to forward and backward seaching for data as disk is.
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priya

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PostPosted: Sun May 15, 2005 11:29 pm
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Then what's the necessity to buy Compact Disks for Rs. 100 other than Tape Disks for Rs.20/-.
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mmwife

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PostPosted: Mon May 16, 2005 7:20 am
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What's a "tape disk" ? And can you explain your comment and relate it to my comments?
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