Re: Fast Copy File

["Carel Teijgeler" <coteijgeler@xxxxxxxxx>]

Perhaps  Referential Constraints, if you use those?

With regards,
Carel Teijgeler

*********** REPLY SEPARATOR  ***********

On 12-11-2008 at 14:11 sjl wrote:

> All -
>
> We were having difficulties when refreshing data libraries in our test 
> environments due to the long time it was taking to rebuild the logical
> files 
> over the physical files.
>
> I determined that it was much more efficient to first /remove/ the LF 
> members from the logical files in the to-library /before/ doing the CPYF 
> command, then submitting jobs to add back the LF members once the PF was 
> copied - thus was born a new command I call FASTCPYF.
>
> The underlying CPP for this command does the following:
>
> 1) DSPDBR of the PF in the to-library to an outfile to capture all of the 
> logical files that are dependent on the PF in the to-library
> 2) DSPFD of the PF in the to-library TYPE(*TRG) to an outfile to capture
> any 
> triggers on the file in the to-library
> 3) Removes all of the LF members from the PF in the to-library
> 4) Removes all of the triggers from the PF in the to-library
> 5) Uses CPYF to copy the from-file to the to-file
> 6) Using the information from DSPDBR, submits jobs to add back all of the 
> logical file members to the PF in the to-library
> 7) Using the information from DSPFD TYPE(*TRG), adds back all of the 
> triggers to the PF in the to-library
>
> Have I missed anything?
>
> > From my preliminary testing on a physical file that has a lot of logical 
> files, FASTCPYF can be 10 times faster than CPYF...
>
> - sjl
>
>
>
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