RE: db_file_multiblock_read_count

From: Hameed, Amir <Amir.Hameed_at_xerox.com>
Date: Wed, 7 Nov 2007 14:28:11 -0500
Message-ID: <304F58144267C5439E733532ABC9A3A1055100D5@USA0300MS02.na.xerox.net>

Alan and Vlad,
You guys seem to be right that this hint only supports a few parameters and MRBC is not one of them. At least I am not able to force the optimizer to scan a table with larger MRBC with this hint.

---

	From: Vlad Sadilovskiy [mailto:vlovsky_at_gmail.com] 
	Sent: Wednesday, November 07, 2007 1:24 PM
	To: Brandon.Allen_at_oneneck.com
	Cc: Hameed, Amir; oracle-l
	Subject: Re: db_file_multiblock_read_count
	
	
	Brandon is right it needs to be tested. I've just gotten from

the 11g and this didn't work for the MBRC, exactly as mentioned in the Docs:          

        "The OPT_PARAM hint lets you set an initialization parameter for the duration of the current query only. This hint is valid only for the following parameters: OPTIMIZER_DYNAMIC_SAMPLING , OPTIMIZER_INDEX_CACHING, OPTIMIZER_INDEX_COST_ADJ, OPTIMIZER_SECURE_VIEW_MERGING, and STAR_TRANSFORMATION_ENABLED. "          

	Vlad Sadilovskiy
	Oracle Database Tools
	Web site: http://www.fourthelephant.com


<http://www.fourthelephant.com/> 

	Blog: http://vsadilovskiy.wordpress.com

<http://vsadilovskiy.wordpress.com/>
                           

        On 11/7/07, Allen, Brandon <Brandon.Allen_at_oneneck.com> wrote:

                I haven't tested it but I think you can use the opt_param hint. It's

                available in 10.2, but not documented - however it is covered in the 11g

                documentation:                          

http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/sql_eleme

                nts006.htm#BABEBAID                 

		Regards, 
		Brandon
		
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Received on Wed Nov 07 2007 - 13:28:11 CST