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handling indexed vsam file sequentially

 
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sreelekshmi

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Joined: 16 Jan 2007
Posts: 9
Location: Bangalore

PostPosted: Thu Jul 19, 2007 10:38 am    Post subject: handling indexed vsam file sequentially
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I need to read an indexed vsam file sequentially from the beginning.If I give the access as 'DYNAMIC' and the passing LOW-VALUES to the key and then using START file name ,will it works?
Also do I need to use READ filename NEXT record or simple READ is enough?

If I need to read the file till the end of file,then every time do I need to used the READ fielname NEXT record statement?

Sree
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Aji

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Joined: 03 Feb 2006
Posts: 53
Location: Mumbai

PostPosted: Thu Jul 19, 2007 11:09 am    Post subject:
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Follow the below mentioned sequence.

Initialize the key.

Start file-name .....
p1.
Read file-name next record at end perform end-para.

Do the process

go to p1.

Aji
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kussu
Warnings : 1

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Joined: 16 May 2007
Posts: 33
Location: India

PostPosted: Thu Jul 19, 2007 4:13 pm    Post subject: Re: handling indexed vsam file sequentially
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U can give Access Mode as Sequential
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nagireddynarva

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Joined: 30 Apr 2005
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Location: hyderabad

PostPosted: Thu Jul 19, 2007 6:40 pm    Post subject: Re: handling indexed vsam file sequentially
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give access mode as sequential
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stodolas

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Joined: 13 Jun 2007
Posts: 632
Location: Wisconsin

PostPosted: Thu Jul 19, 2007 8:18 pm    Post subject:
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I've always been told that processing a VSAM sequentially is very bad from a performance perspective. I know at our shop, the system recognizes this kind of access and throttles your access so you get less CPU.
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