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Home -> Community -> Mailing Lists -> Oracle-L -> Re: index full scan over an index fast full scan in an analytic function?
i cant attach the 10053 trace. it has proprietary info. There isnt much in analytic explain plan either.
does anyone know in general why a full scan would be faster than a fast full scan?
>
> From: <rgaffuri_at_cox.net>
> Date: 2003/10/23 Thu PM 03:09:26 EDT
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: index full scan over an index fast full scan in an analytic function?
>
> I have an index on the two columns used in this query. Why would the optimizer choose an index full scan over an index fast full scan?
>
> My question isnt why an index is used, but the type of index scan?
>
> select *
> from (select col1, col2,
> dense_rank()
> over (partition by col1
> order by col2 desc)tab
> from mytable)
> where tab = 1
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: <rgaffuri_at_cox.net
> INET: rgaffuri_at_cox.net
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: <rgaffuri_at_cox.net INET: rgaffuri_at_cox.net Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: 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 Thu Oct 23 2003 - 14:39:25 CDT
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