Re: Question about opening and closing files

["Lim Hock-Chai" <Lim.Hock-Chai@xxxxxxxxxxxxxxx>]

Are you saying that the alarm() api can actually wake up an in-active
program (ended with *inlr = *off)?  That would be cool if this is true
:).

 


"Charles Wilt" <charles.wilt@xxxxxxxxx> wrote in message
news:<mailman.9454.1220926197.2545.rpg400-l@xxxxxxxxxxxx>...
> Pretty big I'd guess....but it should be easy enough to test for
yourself..
> (Maybe) a better idea:
> Come up with a way to have the trigger program wake up after a few
> minutes and close its files.  This way, if your changing 100s of
> records at a time, you'll only have to pay for one open/close.
>
> Question is how to do the wake up?
> First thought is to use alarm() API along with the appropriate signal
> handling APIs.
>
> BUT I don't know that trigger's play well with signals...don't know
> they don't either. <grin>
>
> Another possibly easier option:
> Look at why is the file open an issue in the first place.  Can you
> make it not an issue?  For instance, once place I've had trouble is
> with a process that uses CLRPFM to clear a work file when that process
> is called by an ODBC/JDBC client.  Instead of a CLRPFM, I sometimes
> will use an SQL DELETE.  Or I'll change the program reading the file
> to delete the record after it reads it.  Consider adding
> REUSEDLT(*YES) to the file.
>
> HTH,
> Charles
>
>
>
>
>
> On Mon, Sep 8, 2008 at 8:47 PM, James Lampert
<jamesl@xxxxxxxxxxxxxxxxx> wrote:
> > How much overhead would you say is involved in making files *USROPN,
and
> > keeping them open only while actually performing I/O on them, as
opposed
> > to doing things the usual way?
> >
> > We're thinking of doing this in a trigger program, in order to cut
back
> > on the number of file locks.
> >
> > --
> > James H. H. Lampert
> > Touchtone Corporation
> >
> > --
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