Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
Home -> Community -> Mailing Lists -> Oracle-L -> Re: db file scattered read
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
>
> Now available One-day tutorials:
> Cost Based Optimisation
> Trouble-shooting and Tuning
> Indexing Strategies
>
> (see http://www.jlcomp.demon.co.uk/tutorial.html )
>
> ____UK_______April 8th
> ____UK_______April 22nd
>
> ____Denmark May 21-23rd
>
> ____USA_(FL)_May 2nd
>
>
> Next dates for the 3-day seminar:
> (see http://www.jlcomp.demon.co.uk/seminar.html )
>
> ____UK_(Manchester)_May
> ____USA_(CA, TX)_August
>
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
>
> ----- 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
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>
>
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: AK INET: oramagic_at_hotmail.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Mar 14 2003 - 15:04:52 CST