Re: Can Bind variables be an issue with respect to network transfer?

Hi Nenad,

well, I have tested and got the best result with the Vararray. But a in list with literals got kind of close in efficienty. Any way, there are easily better ways to write this code than the way it was done.
E.g. if you get all 2400 primary keys in an other in list the processing on the DB is taking 0,5 seconds (rather than 8 Minutes when done 1 by 1.) That s fine with me, I consider that part solved. I hope I get a chance to rewrite the code, in which case I will achieve my goal.
The point is only that I do not understand why so much time is spend network processing.
Intuitively I would believe even processing 2440* 4700 bind variables should not take that long. BTW: The bindvaribles in the list have an average length of 7 byte.
In the past I made the experience that problems not understood can bite you.

Thanks

Lothar

Am 14.10.2020 um 19:20 schrieb Noveljic Nenad:
>
> Hi Lothar,
>
> Mind that this article is for 10g. In the meantime Oracle implemented
> transformations (cost based OR expansion, for example) that could
> generally produce a more efficient plan for the IN list.
>
> Best regards,
>
>
> Nenad
>
> https://nenadnoveljic.com/blog/
>
> *From:*oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org>
> *On Behalf Of *Lothar Flatz
> *Sent:* Mittwoch, 14. Oktober 2020 17:34
> *To:* oracle-l_at_freelists.org
> *Subject:* Re: Can Bind variables be an issue with respect to network
> transfer?
>
> or it is a collection. This is btw. quite often very efficient ,
> because the optimizer can do a hash join.
> http://www.oracle-developer.net/display.php?id=301
>
> Thanks
>
> Lothar
>
> Am 14.10.2020 um 16:12 schrieb Jonathan Lewis:
>
> Nenad,
>
> That's a TIL for me. Never thought of it before.
>
> Thanks.
>
> Jonathan Lewis
>
> On Wed, 14 Oct 2020 at 15:05, Noveljic Nenad
> <nenad.noveljic_at_vontobel.com <mailto:nenad.noveljic_at_vontobel.com>>
> wrote:
>
> “An IN list is limited to 1,000”
>
> Unless it’s a multi-value IN list, which is limited to 1e5
> elements.
>
> Best regards,
>
> Nenad
>
> *From:*oracle-l-bounce_at_freelists.org
> <mailto:oracle-l-bounce_at_freelists.org>
> <oracle-l-bounce_at_freelists.org
> <mailto:oracle-l-bounce_at_freelists.org>> *On Behalf Of
> *Jonathan Lewis
> *Sent:* Mittwoch, 14. Oktober 2020 16:00
> *To:* Oracle L <oracle-l_at_freelists.org
> <mailto:oracle-l_at_freelists.org>>
> *Subject:* Re: Re: Can Bind variables be an issue with respect
> to network transfer?
>
> Lothar,
>
> Comparing the ela for the "PGA allocate memory" with the
> matching "tim=" I think what you're seeing is the time it
> takes Oracle to build an array and copy data from the SQL*Net
> packet to the array. Obviously some of the difference is about
> the time to write to the trace file, even so there's a lot of
> other CPU to account for.and it's happening between the memory
> allocations.  I doubt if "traffic" (i.e. movement across the
> network) is relevant - the ns calls are probably a layer above
> that moving the data between the sql*net layer and the session
> layer.
>
> I am curious about the internal_function() and 4,700
> variables.  An IN list is limited to 1,000 and I wouldn't have
> expected an OR of IN lists to turn into a single
> internal_function(), Perhaps there's something about data
> types and character set conversion (or some other conversion)
> that's adding to the CPU time.
>
> Regards
>
> Jonathan Lewis
>
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