Re: "direct path read" and "db file sequential read" used for full table scans in 11g

You may be interested in these articles: http://hoopercharles.wordpress.com/2010/06/17/_small_table_threshold-parameter-and-buffer-cache-what-is-wrong-with-this-quote/ http://afatkulin.blogspot.com/2012/07/serial-direct-path-reads-in-11gr2-and.html

On Fri, Aug 31, 2012 at 1:09 AM, Allen, Brandon <Brandon.Allen_at_oneneck.com> wrote:
> I found the answer to question #3 - apparently it's a new feature called "In-Memory Parallel Execution" as documented at the links below. I'm still looking for answers on #1 and 2 though if anyone has any ideas.
> http://docs.oracle.com/cd/E11882_01/server.112/e25554/px.htm
>
> http://docs.oracle.com/cd/E11882_01/server.112/e25523/parallel002.htm
>
>
> From: Allen, Brandon
>
>
>
> 1) How can I force production to use the direct path reads?
>
> 2) Why is it using "db file sequential read" for a full table scan instead of "db file scattered read"?
>
> 3) I also tried setting PARALLEL to 2 on the table in question and it did force Oracle to use a parallel execution plan, but it still used "db file sequential read" instead of "direct path read" - any idea why this could be?
>
>
> ________________________________
>
> Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>

-- 
Best regards,
Sayan Malakshinov
Senior oracle developer
PromSvayzBank
Tel: +7 903 207-1576
--
http://www.freelists.org/webpage/oracle-l