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Re: db file scattered read

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Fri, 14 Mar 2003 11:54:42 -0800
Message-ID: <F001.0056AB45.20030314115442@fatcity.com>

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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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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Received on Fri Mar 14 2003 - 13:54:42 CST

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