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Home -> Community -> Mailing Lists -> Oracle-L -> RE: skip scan index
I've done a little bit research and testing on this and one thing that I've
found is that the optimizer will only choose a skip-scan route if the
leading column of the index is relatively non-selective. I haven't been
able to pin down how non-selective it has to be, but I've never had one kick
in with a unique leading column, and it always seems to choose one if the
leading column of the index has only a few distinct values in it.
--Brian
-----Original Message-----
Sent: Wednesday, May 28, 2003 5:00 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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Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting servicesto: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed May 28 2003 - 11:35:37 CDT
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