Re: Re: how to hint a unique index scan?

i know how to choose the index i want. im wondering if there is a way to tell oracle what type of index scan to use. i know you can choose a fast full scan, but what about forcing a unique scan? just because oracle uses a unique index does not mean it always chooses the most efficient TYPE of index scan.
>
> From: Michal Zaschke <[EMAIL PROTECTED]>
> Date: 2003/06/18 Wed AM 08:20:04 EDT
> To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> Subject: Re: how to hint a unique index scan?
>
> You can define the exact index you want to use.
>
> /*+ INDEX ( table [index [index]...] ) */
>
> HTH,
> Mike
>
>
> [EMAIL PROTECTED] wrote:
> > Is there anyway to hint a specific type of scan? I know you can hint a fast full
> > scan.
> >
> > I have something odd happening. I made a copy of a tablespace and transported that
> > copy with in the same instance. So in the one instance. I have two copies of this
> > tablespace.
> >
> > I have two tables that are 99% identical. IE one has about 1% more records and if
> > you validate the indexes on each they are also less than 1% apart.
> >
> > Now in one tablespace an update does an Unique Scan and in the other the EXACT
> > same update does a full scan and runs ALOT slower. I want to mess around.
> >
> > anyway to force a unique index scan? Both tables are analyzed.
> >
>
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> Author: Michal Zaschke
> INET: [EMAIL PROTECTED]
>
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