Stephane,
Thanks a lot for you answer. It's a legacy database. They chose IOT.
The performance is terrible. So I came up with the idea of partitioned IOT. The
problem is I still quite confused that why query only one partition took more
time than query the whole IOT. From the plan the optimizer is using index range
scan. Any clue?
Thanks
Shu
>Date: Mon, 21 Jan 2002 11:57:04 -0800
>To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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>X-Sender: Stephane Faroult <[EMAIL PROTECTED]>
>From: Stephane Faroult <[EMAIL PROTECTED]>
>Subject: Re: Guru's advise needed.Partitioned IOT. Despaired
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>shuli wrote:
>>
>> Dear listers,
>> Could someone share his/her experience on partitioned IOT. I am quite
>> confused now. I have an partitioned IOT. The performance of query data from
one
>> partiton of the partitioned IOT is worse than query data from the
unpartitioned
>> IOT.
>> Any advice would be greatly appreciared.
>> Shu
>>
>
>Shu,
>
> IOTs are not, whether they are partitioned or not, any more than
>anything else, the answer. They are an answer to some special queries
>which are highly important to your application (and, possibly, reasons
>linked to ease of operation). If non-partitioned performs better, go for
>non-partitioned. The only problem I am aware of with partitioned IOTs is
>that you may have deadlocks with SELECTs if you are concurrently
>partitioning them (true in both 8.1.6 and 8.1.7).
>--
>Regards,
>
>Stephane Faroult
>Oriole Ltd
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