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Escapa
Senior Member
Joined: 16 Feb 2007
Posts: 1399
Location: IL, USA
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| how can i read nth (say 10th here) record in vsam ksds file? |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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| Using ? |
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Escapa
Senior Member
Joined: 16 Feb 2007
Posts: 1399
Location: IL, USA
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using cobol.
and i dont know the key
but i know the position i.e. it is tenth record in the file. |
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PeD
Active User
Joined: 26 Nov 2005
Posts: 459
Location: Belgium
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Read sequentially from the beginning 9 records and the next one is yours.
No magic. Or did I lost so much during my holiday? |
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Escapa
Senior Member
Joined: 16 Feb 2007
Posts: 1399
Location: IL, USA
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i want to reach directly to nth record not by reading it sequentialy.
is there any other way to do that? |
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PeD
Active User
Joined: 26 Nov 2005
Posts: 459
Location: Belgium
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| With a KSDS and except if your key represents the sequence of the records, I cannot see a way to do it. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
Even if you could directly read the nth record, what business need would it fill?
What happens when a few records are added or deleted and "that" record changes positon in the file?
If you explain the requirement, we may be able to offer suggestions.
Pierre,
| Quote: |
| Or did I lost so much during my holiday? |
No telling what may happen when you leave on holiday  |
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Escapa
Senior Member
Joined: 16 Feb 2007
Posts: 1399
Location: IL, USA
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Hi Dick,
there is huge file but specific chunk of data i . ae.
if rec 1 has value x then read from rec 1 to end
if rec 1 has value y then read from rec hm to rec m+value fetched from rec 1
if rec 1 has value z then read from rec hm to rec n+value fetched from rec 1
etc.
currently in production logic is implemented such that file is getting read sequentially keeping count of record and only records required are used using count.
so every time file is read till last record required from start.
I was thinking if it is possible to read first record and directly jump to required record no it will improve performance by lot. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
| Quote: |
| I was thinking if it is possible to read first record and directly jump to required record |
Not that i'm aware of.
How does rec1 get built with these values x, y, z? If rec1 could be built using key values rather than numbers of records you should be able to accomplish what you need. |
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revel
Active User
Joined: 05 Apr 2005
Posts: 135
Location: Bangalore/Chennai-INDIA
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Hi Sambhaji,
You can do that by populating high values to the key fields of that file
ex;
consider a vsam file with structure
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01 emp-rec.
03 emp-id pic x(05) >>> key value
03 emp-name pic x(20).
03 emp-sal pic 9(4). |
After validating first record, simply populate High-values or X'FFFFF' to
key fields(ie emp-d). and read that record....
Just check it out and let me the result... |
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dbzTHEdinosauer
Global Moderator
Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne
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| This silliness is yet another reason to migrate to db2. |
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