>> Trifling.... even if we do an FTS
Until your developers develop a query next month that joins that table to
the 200 million row table they are planning on installing but just forgot to
tell you about.
Developers are funny that way.....
"Excuse me, did you plan any indexing on this table??"
"Hints? We don't need no stinking hints, the optimzer is way to smart to
need hints."
Robert
-----Original Message-----
To: Multiple recipients of list ORACLE-L
Sent: 5/28/2003 10:29 AM
Kevin,
Thanks.... these will NOT be ad-hoc queries but part of the app -- for
the admin and customer service users.
I'm leaning more and more towards setting things up so that we either
do a full table scan or use two indexes.
I just did a query -- since the app was released in December, we have
had just over 24,000 rows added to the order table.
Trifling.... even if we do an FTS
Rachel
- Kevin Toepke <ktoepke_at_rlcarriers.com> wrote:
> Rachel
>
> My experience with index skip scans can be summed up as follows. If
> you know
> the app will be doing a particular scan, create the index.
>
> Index Skip Scans should be thought of a means to help optimize those
> pesky
> ad-hoc queries only.
>
> I haven't been able to get a skip-can to work unless there is a
> simple
> restriction (>, <, =) on the non-leading column. My experience tells
> me they
> don't help when you are joining against a non-leading column or you
> are
> using an IN condition (either static or sub-query)
>
> HTH
> Kevin
>
> -----Original Message-----
> Sent: Wednesday, May 28, 2003 7:00 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Okay, I have a developer here who has been reading the docs (this can
> be dangerous!)
>
> we are adding functionality to one of our applications, this will
> involve using multiple fulfillment houses, so we'll be adding the
> fulfillment vendor id to the order table. Easy, this is not a
> problem.
> We want to be able to search by order date and by fulfillment vendor
> id/order date
>
> Traditional design would be to add two indexes: one on order date,
> and
> a concatenated one on fulfillment vendor id/order date.
>
> The developer is telling me to create a "skip scan index" instead of
> two different ones. MY reading in the FM tells me that skip scan
> index
> is not a type of index, but rather a way Oracle uses to use an index
> even if the leftmost column is not in the query.
>
> Is there any benefit in my building only the one index? Our order
> volume is not so high (and never will be) that there is a visible
> performance impact if I have the two indices.
>
> This is 9i, 9.2.0.1, will be upgrading to 9.2.0.2 in the near future.
> Solaris
>
> Any suggestions/comments/war stories would be appreciated. I know
> I've
> seen Jonathan post on skip scan indexes before but I can't find the
> specific reference at the moment.
>
> Rachel
>
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Received on Wed May 28 2003 - 12:28:17 CDT
