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Re: db file scattered read

From: AK <oramagic_at_hotmail.com>
Date: Fri, 14 Mar 2003 13:04:52 -0800
Message-ID: <F001.0056ACC8.20030314130452@fatcity.com>


Thanks Jonathen ,
But what I am pointing to is , why it is reading 3 blocks first time and then 8 blocks next time , why not 8 blocks always . Look at p3 which is no of block read .

-ak

>
> The counts are inclusive:
> 14706 / 3 means
> 14,706 14,707 14,708
> so you have to skip one then start
> again at 14,710.
>
> Yes, 'ela' is the elapsed time in 1/100 of a second.
>
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
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> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: 14 March 2003 17:04
>
>
> Here is a part of trace file . I am finding that oracle is trying to
> read 8 or 3 or 7 blocks at a time . But block numbers are all
> sequential i.e. it will read 3 blocks starting from 14706 and then 8
> blocks starting from 14710 ( 14706+3 ). Why it doesn't read 8 blcoks
> always it multi_block_read is set to 8 ? Any Idea .
> Also what is ela=1 ,does it mean elapsed time is 1 sentisec ?
>
>
>
> WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14706 p3=3
> WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14710 p3=8
> WAIT #32: nam='db file scattered read' ela= 2 p1=4 p2=14718 p3=8
> WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14727 p3=3
> WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14731 p3=7
> WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14739 p3=3
> WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14744 p3=8
> WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=129784 p3=8
>
>
> Thanks
> -ak
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: AK
  INET: oramagic_at_hotmail.com

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Received on Fri Mar 14 2003 - 15:04:52 CST

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