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What is diff between block merge and conventional merge

 
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saptagiri kintali

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Joined: 21 Sep 2007
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Location: chennai

PostPosted: Sat Sep 29, 2007 11:08 am    Post subject: What is diff between block merge and conventional merge
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can any one please explain wat is diff between BLOCK merge and CONVENTIONAL merge.
i read in one book that in case of block merge we can merge 100 files,but the same in case of conventional merge we can up to 16, why?
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krisprems

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Joined: 27 Nov 2006
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PostPosted: Sat Sep 29, 2007 12:32 pm    Post subject:
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saptagiri kintali
Have a look at these reference links:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ice1ca20/9.2.3.2?ACTION=MATCHES&REQUEST=conventional&TYPE=FUZZY&SHELF=ICE1SH20.bks&DT=20060615185603&CASE=&searchTopic=TOPIC&searchText=TEXT&searchIndex=INDEX&rank=RANK&ScrollTOP=FIRSTHIT#FIRSTHIT
Blockset Technique
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ice1ct00/2.1?ACTION=MATCHES&REQUEST=conventional&TYPE=FUZZY&SHELF=ICE1SH20.bks&DT=20031124135012&CASE=&searchTopic=TOPIC&searchText=TEXT&searchIndex=INDEX&rank=RANK&ScrollTOP=FIRSTHIT#FIRSTHIT
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saptagiri kintali

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PostPosted: Sat Sep 29, 2007 1:10 pm    Post subject: Reply to: What is diff between block merge and conventional
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THANK U,
but how can i specify in my code to use blockset or conventional and which is default.
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krisprems

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PostPosted: Sat Sep 29, 2007 1:34 pm    Post subject:
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saptagiri kintali

Quote:

DFSORT uses Blockset whenever possible.
It is worth checking to see if Blockset was used for a given application; message ICE143I in the SYSOUT data set shows which technique was used. If ICE143I is not shown or shows that a technique other than Blockset was selected, resubmit the application with a SORTDIAG DD statement (unnecessary if the application already had a SORTDIAG DD statement or if your site has specified installation option DIAGSIM=YES). Additional DFSORT messages and diagnostic information are then shown, including:


ICE802I, which shows the technique used
ICE800I or error messages

ICE800I gives a code indicating why Blockset was not used. If the code is 1, one or more error messages are also shown.

As per the info from the above quote(picked from the links i provided), the DFSORT decides as to what would be the right techniques to be used, you need not force the DFSORT to select the particular technique.
Anyways, for confirmation you could wait for Frank's comments on this.
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Frank Yaeger

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Joined: 15 Feb 2005
Posts: 7130
Location: San Jose, CA

PostPosted: Sat Sep 29, 2007 8:18 pm    Post subject:
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Quote:
but how can i specify in my code to use blockset or conventional and which is default.


I can't add much to Krisprem's quotes from the DFSORT books. Blockset is the very much prefered technique and will be used in almost all cases. If Blockset is not used, you should check the ICE800I message to determine why and try to remove the condition that caused Blockset not to be used.

Quote:
i read in one book that in case of block merge we can merge 100 files,but the same in case of conventional merge we can up to 16, why?


Yes, that's true. Blockset is our most efficient merge technique and is normally used for merge opreations - we enhance Blockset frequently. Conventional merge is a much older, less efficient technique that normally isn't used - we do not enhance it and it is not recommended.
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saptagiri kintali

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PostPosted: Sun Sep 30, 2007 12:06 pm    Post subject:
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thank u frank,
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