Re[2]:partitioning

From: <dgoulet_at_vicr.com>
Date: Thu, 20 Mar 2003 11:05:30 -0500
Message-Id: <24726.322552@fatcity.com>

Peter,

I've not had very good luck with hash partitioning either, but range works damn nicely both from a data insertion/update and query point of view. CBO also runs very consistently.

Dick Goulet

____________________Reply Separator____________________

Subject: Re:partitioning
Author: Peter Barnett <regdba_at_yahoo.com> Date: 3/20/2003 6:23 AM

As we have discovered, hash partitioning does not always give you partition elimination nor does CBO always work as expected. One of our DBAs has a tar open with Oracle on this issue and we are finding that no one appears to understand the complete ramifications of using hash partitions when a query is run against large data sets.

In short, if you only care about getting data into a partition use hash partitioning. If some day you want to get data out you may want to look at another solution. Range partitioning might work depending on your data. Disk striping might work but consistently getting the right data to the right stipe is tricky business.

dgoulet_at_vicr.com wrote:
> I'm not sure what your trying to accomplish. You
> get one insert for one
> record. Which partition is used depends on how you
> set them up. If your
> wanting the partitions to be used in a circular
> fashion I believe that is
> accomplished with a hash partition and you get to
> create the hashing method.
>
> Dick Goulet
>
> ____________________Reply
> Separator____________________
> Author: "Basavaraja; Ravindra"
> <Ravindra.Basavaraja_at_T-Mobile.com>
> Date: 3/19/2003 11:00 AM
>
> Hi,
>
> I am wondering if there is any way to achieve
> horizontal partitioning in Oracle.
>
> Assuming that I have about 8 partitions for a
> table.When there is INSERT onto
> this table I want one record
> to be inserted into each partition i.e
> 1st record goes into partition 1
> 2nd record goes into partition 2
> 3rd record goes into partition 3
> .....
> .....
> 8th record goes into partition 8
> 9th record goes into partition 1.

>
> I guess this feature is available in Informix
> handled by The informix engine.I
> am not sure if Oracle has something
> similiar to this OR is it possible to design a logic
> and embede it ,but what
> would be the performance effect?
>
> Any thoughts or similiar ideas
>
> Thanks
>
>
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.net
> --
> Author: Basavaraja, Ravindra
> INET: Ravindra.Basavaraja_at_T-Mobile.com
>
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>

Pete Barnett
Lead Database Administrator
The Regence Group
pnbarne_at_regence.com

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Received on Thu Mar 20 2003 - 10:05:30 CST