Re: Deciding what columns to partition on

Jared/Stephane,

It is true that a lot of our queries don't lend themselves to locally partitioned indexes. I tried to convert some globally partitioned indexes to locally partitioned ones with fairly poor results. It sort of like trying to force a square peg into a round hole.

I just wish that our warehouse was a nice, neat, tidy, textbook one that responded perfectly to all of the recommendations experts make in their books.

Thanks guys,

Cherie

                                                                                       
                       
                    Stephane                                                           
                       
                    Faroult              To:     Multiple recipients of list ORACLE-L 
<ORACLE-L_at_fatcity.com>  
                    <sfaroult_at_orio       cc:                                           
                       
                    le.com>              Subject:     Re: Deciding what columns to 
partition on               
                    Sent by:                                                           
                       
                    root_at_fatcity.c                                                     
                       
                    om                                                                 
                       
                                                                                       
                       
                                                                                       
                       
                    12/19/01 05:10                                                     
                       
                    AM                                                                 
                       
                    Please respond                                                     
                       
                    to ORACLE-L                                                        
                       
                                                                                       
                       
                                                                                       
                       

Jared Still wrote:
>
> On Tuesday 18 December 2001 12:55, Stephane Faroult wrote:
> > I have never found the argument 'you
> > scan a single partition' very compelling when your data is properly
> > indexed.
>
> Stephane,
>
> This is assuming that you are using global indexes on your
> partitioned tables. If using local indexes and searching by
> something other than the partition key, all indexes will
> be scanned if used at all.

Excellent point. Which rather goes AGAINST partitioning-as-a-performance-improvement-factor. In fact, I have never managed to do without global indexes. Users always seem to want to ask the wrong questions. When I wear my DBA cap I really like partitions. Otherwise I rather like them as an alternative to bitmap indexes (so to speak).

--
Regards,

Stephane Faroult
Oriole Ltd
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
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).




-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: 
  INET: Cherie_Machler_at_gelco.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
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).