Re: Improving Performance of Hash Joins

From: Robert Klemme <>
Date: Fri, 26 Dec 2008 11:57:56 +0100
Message-ID: <>

On 25.12.2008 23:06, Mark D Powell wrote:

> On Dec 25, 3:04 pm, wrote:

>> I am on Oracle on Windows 2003 32 bit. I have /3GB switch set
>> on and have a value of sga_target set to 2.x GB,
>> I am using a third party package and many queries are doing hash
>> joins. I cannot modify any queries because of no source code available
>> to me. I know in Oracle9i, there was some init.ora parameter for
>> specifying memory used by hash joins which has been taken away in 10G.
>> What are my options (if any) to improve performance of this hash joins
>> which for some queries take 2-3 minutes.

Are schema and system statistics up to date? Is it a bad plan or is the plan good and it just takes too long?

> By the way on a 9.2 system you can potentially use the OUTLINE feature
> to provide hints to the vendor SQL without ever having to change the
> source.

If I understood him correct he is on 10g now - which should still have stored outlines AFAIK.

Kind regards


remember.guy do |as, often| as.you_can - without end
Received on Fri Dec 26 2008 - 04:57:56 CST

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