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Difference between overlay and build

 
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shchan

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Joined: 06 Jun 2007
Posts: 58
Location: Hyderabad

PostPosted: Thu Aug 09, 2007 6:51 pm    Post subject: Difference between overlay and build
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Hi,
Can anyone tell me what is overlay and build.I have a vague idea about build..but i dont know the difference between the two.And in which scenario we use build and overlay
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krisprems

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Joined: 27 Nov 2006
Posts: 649
Location: India

PostPosted: Thu Aug 09, 2007 7:24 pm    Post subject:
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shchan

From "z/OS DFSORT Application Programming Guide":

BUILD:
Quote:
BUILD or FIELDS: Reformat each record by specifying all of its items one by one. Build gives you complete control over the items you want in your reformatted INREC records and the order in which they appear. You can delete, rearrange and insert fields and constants

Check the topic FIELDS or BUILD at
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ice1ca20/3.8?ACTION=MATCHES&REQUEST=BUILD&TYPE=FUZZY&SHELF=ICE1SH20&DT=20060615185603&CASE=&searchTopic=TOPIC&searchText=TEXT&searchIndex=INDEX&rank=RANK&ScrollTOP=FIRSTHIT#FIRSTHIT&PICTORIAL=N
OVERLAY:
Quote:
if you only want to change one or a few items and keep the rest of the record in its original form, there's an easier way: the OVERLAY parameter

Check this topic Reformatting Records with OVERLAY at http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ice1cg20/2.4.14?ACTION=MATCHES&REQUEST=overlay&TYPE=FUZZY&SHELF=ICE1SH20&DT=20060615173822&CASE=&searchTopic=TOPIC&searchText=TEXT&searchIndex=INDEX&rank=RANK&ScrollTOP=FIRSTHIT#FIRSTHIT

In the Topic http://ibmmainframes.com/viewtopic.php?t=23473 i had pointed you to z/OS DFSORT: Getting Started . If you had a look at it you would have got good foundation for your journey in DFSORT!
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ParagChouguley

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Joined: 03 Feb 2007
Posts: 175
Location: PUNE(INDIA)

PostPosted: Thu Aug 09, 2007 7:24 pm    Post subject:
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Hi,
Quote:
BUILD: Reformat each record by specifying all of its items one by one. Build gives you complete control over the items you want in your reformatted records and the order in which they appear. You can delete, rearrange and insert fields and constants.
OVERLAY: Reformat each record by specifying just the items that overlay specific columns. Overlay lets you change specific existing columns without affecting the entire record.


For more information read the document named "DFSORT Getting Started.pdf" which you will find in this forum.

--Parag
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Frank Yaeger

DFSORT Moderator


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

PostPosted: Thu Aug 09, 2007 11:00 pm    Post subject:
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shchan,

If you're not familiar with DFSORT and DFSORT's ICETOOL, I'd suggest reading through "z/OS DFSORT: Getting Started". It's an excellent tutorial, with lots of examples, that will show you how to use DFSORT, DFSORT's ICETOOL and DFSORT Symbols. You can access it online, along with all of the other DFSORT books, from:

www.ibm.com/servers/storage/support/software/sort/mvs/srtmpub.html
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shchan

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Joined: 06 Jun 2007
Posts: 58
Location: Hyderabad

PostPosted: Fri Aug 10, 2007 12:20 pm    Post subject:
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Thanks Frank
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