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Reading large files in REXX

 
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Pradeep Thangapandy

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Joined: 22 Feb 2008
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Location: United Kingdom

PostPosted: Wed Apr 01, 2009 11:41 am    Post subject: Reading large files in REXX
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When i try to read huge file having millions of records i could not do it using EXECIO command. Is there any approach for reading large files in REXX?
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Wed Apr 01, 2009 11:44 am    Post subject:
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Yes, using EXECIO - but you need to process the file in sections.

There is an example on the forum that I posted some time ago.
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ofer71

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Joined: 27 Dec 2005
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PostPosted: Wed Apr 01, 2009 11:50 am    Post subject:
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Here's a rule-of-thumb for you: Reading large datasets in REXX is a bad idea. Not only the storage is exhausted, the process consumes a lot of CPU.

O.
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Wed Apr 01, 2009 7:43 pm    Post subject:
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Hello,

FWIW - there is always a better way to process large files than to use rexx/execio. . .

Keep in mind that things that are bad performers originally will only get worse as volume increases (and it usually does).
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