Re: order by question

On 24 Okt, 12:46, sybrandb <sybra..._at_gmail.com> wrote:
> On 24 okt, 10:56, sbr..._at_yahoo.com wrote:
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> > On 23 Okt, 17:34, sybra..._at_hccnet.nl wrote:
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> > > On Thu, 23 Oct 2008 07:34:51 -0700 (PDT), sbr..._at_yahoo.com wrote:
> > > >I have not been able to get a resultset which is unsorted acording to
> > > >x.z but need to know that this would not happen in a productive
> > > >environment.
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> > > By definition all SQL prodiuces a set. The set is always an
> > > *unordered* collection *by design*, because that is mathematical
> > > theory.
> > > Ergo: Oracle does NOT guarantee any resultset is according to any
> > > order, when there is no order by clause in the top level of the query.
> > > It would be very silly to 'rely' on a specific ordering, and raises
> > > suspicions your 'productive environment' is not so productive, as it
> > > is processing a set as a bunch of records.
> > > Which it shouldn't as that wouldn't scale.
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> > > --
> > > Sybrand Bakker
> > > Senior Oracle DBA
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> > If you dont have anything valuable to add then dont. Do you actually
> > have an example of when the resultset is not ordered because I have
> > not been able to produce it. If yes then please say so. That would be
> > valuable information for me. I already know that "Oracle does NOT
> > guarantee any resultset is according to any order, when there is no
> > order by clause in the top level of the query". That is pretty much
> > basic stuff and this information is not valuable to me. And yes the
> > system is productive. The select is in a function which returns a
> > sys_refcursor to a java application. The select is based on tables
> > where several of them contains more than 10 million records and is
> > working well thus far. I do not see why it would not be scalable.
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> > Slavko- Tekst uit oorspronkelijk bericht niet weergeven -
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> > - Tekst uit oorspronkelijk bericht weergeven -
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> If you are not interested in hearing you shouldn't rely on default
> ordering, why post an insulting response?
>
> --
> Sybrand Bakker
> Senior Oracle DBA- Dölj citerad text -
>
> - Visa citerad text -

Sybrand:
You were not answering my question. I thought it was obviuos from my question that I understand that Oracle does not guarantee the correct sort order but that I have not been able to produce a wrong order. And then you were questioning if this really was for a productive environment or not and that it would not be scalable. I found that you did not try to be helpful but instead tried to belittle my question as being stupid. If that was not your intent then I apologize. If you can produce an example with wrong ordering I would be grateful.

Jim:
I have tried to search on askTom but not found anything. I have only found out that one cannot rely on Oracle to order by when records were inserted (which I already knew). If you have a link I would be very thankful. Received on Fri Oct 24 2008 - 06:08:00 CDT