RE: How to optimize COPY *ADD

["Alexei Pytel" <pytel@xxxxxxxxxx>]

When you run your copy process, observe CPU usage.
If you are close to 100%, I doubt that splitting it in parallel will give
you any benefit.
On the other hand, if you have more than one procesor on system, this is
certainly worth a try.
To have benefit from splitting some work to several parallel processes,
there should be underutilized system resources you hope to use better.

You may also want to look at 5722SS1 option 26 - DB2 Symmetric
Multiprocessing. It can process index update in parallel even for one job.
But again, to benefit from any sort of parallelism, you first need some
unused resourcs to spare.

    Alexei Pytel

"The better is the worst enemy of the good"




                                                                                
                   
                    Dimitri Efimov                                              
                   
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That's correct, we are copying daily built file to history file, the point
is - the history file has more than 200 mln. of records, even more - it has
18 index files. So it's impossible to find "keyed sequence".

But I'm going to try the solution Buck's solution ("Multiple CPYF commands
in parallel might be better if you have a good way to partition the records
such as FROMRCD(1)
TORCD(1000000)...FROMRCD(1000001) TORCD(2000000) ...) hope it will work.

Thanks a lot

Dmitri Efimov
Banco Wiese Sudameris

DEF

-----Mensaje original-----
De: Joel Fritz [mailto:JFritz@sharperimage.com]
Enviado el: Viernes, 27 de Julio de 2001 01:25 p.m.
Para: 'MIDRANGE-L@midrange.com'
Asunto: RE: How to optimize COPY *ADD


If I understand you correctly, you're copying a file that's built daily to
a
history file.  Six hours sounds like a long time for 4,000,000 records.
Are
you copying in keyed sequence?  If you are you could try fromrcd(1).

Otherwise, you could break it down into "simultaneous" submitted jobs using
fromrcd(x) torcd(y).

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