Oracle-L: Re: sequential reads/scattered reads

From: <Jared.Still_at_radisys.com>
Date: Thu, 11 Jul 2002 11:08:24 -0800
Message-ID: <F001.004956D5.20020711110824@fatcity.com>

Are you actually experiencing a performance problem?

Are users complaining?

If not, then don't worry about it, find something else to do. :)

If so, ( and this has already been stated to you I think ) check the wait times, don't worry about doing a lot of I/O.

If you don't know how to check the wait times, there have been a number of web sites and papers already suggested. I'm just chiming in to help impress on you that there are a lot of misconceptions about tuning.

RAID 5 is fine for some databases. If you're doing mostly reads, it's actually pretty good.

Jared

"oraora oraora" <oraoraora_at_rediffmail.com> Sent by: root_at_fatcity.com
07/11/2002 04:33 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        sequential reads/scattered reads

Guys,

Querying my v$session_wait shows 10 rows each DB FILE SEQUENTIAL READ and DB FILE SCATTERED READ.

manuals explain it all b'coz of I/O.

there are 33 tables and 110 indexes in the same USERS tablespace with only one datafile USERS01.DAT of size 12GB.

it's physically laid out in D:\oracle\data. but the hard disk capacity is 100GB with 8 disk heads and RAID5.

will not moving the tables and indexes to seperate tablespace reduce I/O traffic ? my manager here says that since it is configured with RAID5 and 8 disk heads , it's not a problem.

is it so ? is he right ?
plz. clarify me. i need to explain him.
it's urgent.he is sitting on my head.

TIA.

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Author: oraora oraora
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