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Limit in Length for a CICS START


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seahawk789

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Joined: 22 Feb 2010
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Location: Cochin

PostPosted: Mon Apr 02, 2018 8:34 pm
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Hi Team,

In the manuals I read the following description about Length, but its mentioned upper limit is 32K but assume a 24KB limit in some cases. But I am not sure what those cases are where we should use 24KB instead of 32KB. Can someone please clarify or is it always safe to assume the length in START command can be max of 24KB ?

"When a CICSĀ® command offers the LENGTH option, it is expressed as a signed halfword binary value. This puts a theoretical upper limit of 32 763 bytes on LENGTH. In practice, depending on issues of recoverability, function shipping, and other factors, assume a 24 KB limit."


Code:
EXEC CICS START
     TRANSID('TRN2')
     FROM(DATAFLD)
     LENGTH(100)
END-EXEC

[/code]
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Robert Sample

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PostPosted: Mon Apr 02, 2018 9:15 pm
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Use an upper limit of 24KB -- the manual does not lie to you.
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seahawk789

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PostPosted: Mon Apr 02, 2018 10:57 pm
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Robert Sample wrote:
Use an upper limit of 24KB -- the manual does not lie to you.


Thanks Bob. But I was wondering why the theoretical value of 32K cannot be used ?
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Robert Sample

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PostPosted: Tue Apr 03, 2018 12:01 am
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I don't go by "Bob" -- my name is Robert.

The manual says for recoverability and function shipping and other factors -- so presumably recoverability, function shipping, etc. reduces the 32K down to 24K.
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seahawk789

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PostPosted: Tue Apr 03, 2018 12:04 am
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Robert Sample wrote:
I don't go by "Bob" -- my name is Robert.

The manual says for recoverability and function shipping and other factors -- so presumably recoverability, function shipping, etc. reduces the 32K down to 24K.


Thank you Robert. I will use 24k then. I was not familiar with the terminology "function shipping"
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Robert Sample

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PostPosted: Tue Apr 03, 2018 12:44 am
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Function shipping has been part of CICS for a number of years. It allows a local CICS transaction to use resources in another CICS region (for example). There obviously is some overhead required to allow such functionality to occur.
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seahawk789

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PostPosted: Tue Apr 03, 2018 1:11 am
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Robert Sample wrote:
Function shipping has been part of CICS for a number of years. It allows a local CICS transaction to use resources in another CICS region (for example). There obviously is some overhead required to allow such functionality to occur.


Thank You so much for clarifying.
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