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difference between COMP and COMP-3

 
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pkaushi
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PostPosted: Wed Feb 08, 2006 10:53 am    Post subject: difference between COMP and COMP-3 Reply with quote

Hi,

I would like to know the situation of when do we use a COMP and when COMP3. I know that COMP stores binary data and COMP-3 packed decimal. But what actually are the scenarios where we uese the two??
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Prashant
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prasad
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PostPosted: Thu Feb 09, 2006 8:33 am    Post subject: Usage of COMP and COMP-3 values Reply with quote

Hi pkaushi,


It depends how it's being used.

My recommendation is, if you're doing arithmetic then use COMP-3.
If you're not using Indexes and you're subscripting into an array then use COMP (as recommended by IBM).

More details about COMP & COMP-3 are below.

COMP
-------
To produce the most efficient code for a BINARY data item, ensure that it has:
. A sign (an S in its PICTURE clause)
. Eight or fewer digits
TRUNC(STD) / TRUNC(BIN) / TRUNC(OPT) compiler options will change the performance of the comp significantly.


COMP-3
---------
To produce the most efficient code for a PACKED-DECIMAL data item, ensure that it has:
. A sign (an S in its PICTURE clause)
. An odd number of digits (9s in the PICTURE clause), so that it occupies an exact number of bytes without a half byte left over
. 15 or fewer digits in the PICTURE specification to avoid using library routines for multiplication and division



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Prasad
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ravi
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PostPosted: Mon Aug 14, 2006 4:22 pm    Post subject: file Reply with quote

what is a index file ? how to handle it
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