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db file scattered read

From: AK <oramagic_at_hotmail.com>
Date: Fri, 14 Mar 2003 09:04:33 -0800
Message-ID: <F001.0056A497.20030314090433@fatcity.com>


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
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Author: AK
  INET: oramagic_at_hotmail.com

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