RE: Fast Full Index Scan in 8.1.7

Have you modified your two index_caching init parameters? If not, this can prove to make some really weird things happen. Also consider first rows to favor index use.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275

Fuelspot
73 Princeton Street
North, Chelmsford 01863  

-----Original Message-----
Sent: Friday, September 07, 2001 7:56 AM To: Multiple recipients of list ORACLE-L

I wanted to turn it off in testing so I could try some other indexes as an alternative. I'm not sure that I trust it to make a good decision.

Even with an alternative index hint, it's not using the index I'm trying to get it to use, but rather the fast full index scan. I can't see any typo but maybe it just can't use that index with full full index scan enabled.

That's why I wanted to try and disable it and see what would happen.

CBO does some interesting things. Every time I think I have a handle on some aspect of it, it changes and starts doing something different.

Thanks for your reply.

Cherie  

                    Jared Still

                    <jkstill_at_cybco       To:     ORACLE-L_at_fatcity.com,
Cherie_Machler_at_gelco.com                    
                    n.com>               cc:

                                         Subject:     Re: Fast Full Index
Scan in 8.1.7                            
                    09/07/01 12:04

                    AM

 

 

The alternative is probably a full table scan.

Are you sure you want to turn it off?

I think you need to hint your SQL to do that.

Jared

On Thursday 06 September 2001 13:21, Cherie_Machler_at_gelco.com wrote:
> I had been using the FAST_FULL_SCAN_ENABLED initialization parameter
> in

an
> 8.0.4 database.
>
> Apparently this parameter is now obsolete in 8.1.7.2. Seems as though I
> am getting the fast full index
> scans automatically now. I'm not sure if I want them in all cases. Is
> there a way to turn them off?
>
> Thanks,
>
> Cherie Machler
> Oracle DBA
> Gelco Information Network

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