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 - 10:29:44 CDT
