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lucky.rohith
Currently Banned
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Joined: 06 Aug 2006
Posts: 10
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Hi
What is the maximum size of DFHCOMMAREA?
is tat 32k or 64k? |
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venkagov
New User
Joined: 10 Aug 2006
Posts: 6
Location: Chennai
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Hi,
The maximum size of DFHCOMMAREA is 32K, however it is recommended (by IBM) that it not exceed 24K.
Regards,
Venkagov |
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anandss6
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Joined: 12 Dec 2005
Posts: 7
Location: trivandrum
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Hi
The maximum size of DFHCOMMAREA is 64k
Regards
Anand |
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naresh_1246
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Joined: 19 Aug 2006
Posts: 1
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| max size of dfhcommarea is 32k |
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meetreks
New User
Joined: 28 Sep 2006
Posts: 26
Location: Edinburgh
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| Actually, with the news CICSTS 2.1 or above, there is no specific limit to the size of DFHCOMMAREA. But for paging constraints, it is always better to hold it down to <32K. |
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dineshpost
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Joined: 06 Nov 2008
Posts: 2
Location: India - Chennai
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| The Max size of DFHCOMMAREA is 65k |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA
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Why argue when you can check the manual (link at the top of the page)? If this had been done, someone could have found the Application Programming Reference manual for CICS, where section 1.205 states
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| The valid range for the COMMAREA length is 0 through 32 763 bytes. If the length provided is outside this range, the LENGERR condition occurs. |
Note that EIBCALEN is a PIC S9(04) COMP field and therefore cannot exceed 32767 (or 32K minus 1) so that sets the absolute limit on commarea length -- unless IBM changes the EIB structure, and that is not very likely to happen in the foreseeable future. IBM took 4 bytes off this maximum, so the real limit is 32763. However, elsewhere IBM recommends NOT using more than 24K of commarea. |
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MBabu
Active User
Joined: 03 Aug 2008
Posts: 400
Location: Mumbai
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Darn. I liked all the other answers, which can be summed up by the formula:
Max commarea length = 1024 * (random number between something and something else) + (# of people who don't read the manuals) + (made up release numbers) / (# of nonexistent enhancements) modulo whatever plus or minus a bunch. |
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Earl Haigh
Active User
Joined: 25 Jul 2006
Posts: 475
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Robert has it right. for all you that posted max size of commarea greater than 32767, please write some code that moves data to the entire area of your larger DFHCOMMAREA, and be sure to move the program to
a PRODUCTION CICS region. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA
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| Hmmm, Mbabu, maybe next time we'll see how many different answers are posted in 24 hours? |
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bantu2405
New User
Joined: 03 Nov 2009
Posts: 2
Location: Pune
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Hi,
The maximum length is 32K.
Pay attention to the followup below. |
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Binop B
Active User
Joined: 18 Jun 2009
Posts: 407
Location: Nashville, TN
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Hi Bantu,
Welcome to the forum... 
The topic/post has already been well answered by Robert.
Any particular reason why you have posted the same answer again ?  |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA
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| bantu2405, any particular reason you posted a wrong answer AFTER the correct answer was provided? 32K is not the maximum size for DFHCOMMAREA, period. The IBM manuals are pretty reliable -- without an extremely good reason to the contrary, you should believe their information. |
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