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Logical Record Length

 
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lav79
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Joined: 09 Jun 2003
Posts: 1
Topics: 1
PostPosted: Tue Feb 24, 2004 5:09 am    Post subject: Logical Record Length Reply with quote
I would like to know the significance behind calling the parameter record length in DCB as logical record length instead of just record length.
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vini
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Joined: 12 Jan 2004
Posts: 240
Topics: 48
Location: Maryland
PostPosted: Tue Feb 24, 2004 2:42 pm    Post subject: Reply with quote
My best guess is ... it implies .. if that File is being used in a Program ...it would have a length defined there .. call that the Logical length .. and that should match the one specified in the JCL LRECL.

Last edited by vini on Wed Feb 25, 2004 11:03 am; edited 1 time in total
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slade
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Joined: 07 Feb 2003
Posts: 266
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Location: Edison, NJ USA
PostPosted: Tue Feb 24, 2004 10:52 pm    Post subject: Reply with quote
Hi Lav,

My guess is that most files carry data in "physical" blocks. Their length is defined using the BLKSIZE param. These physical blocks can also be sub-divided
"logically" into smaller segments whose length can be defined using the LRECL param.

Just a guess, but it makes sense.

Regards, Jack.
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mfjin
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Joined: 26 Apr 2003
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PostPosted: Wed Feb 25, 2004 7:20 am    Post subject: Reply with quote
lav79, was this question asked in an interview?
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Maton_Man
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Joined: 30 Jan 2004
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PostPosted: Wed Feb 25, 2004 10:04 pm    Post subject: Reply with quote
LRECL = logical
BLKSIZE = physical

Btw, LRECL can exceed blocksize for VBS files eg. some SMF records.
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