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Home -> Community -> Mailing Lists -> Oracle-L -> Re: sequential reads/scattered reads
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
INET: oraoraora_at_rediffmail.com
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INET: Jared.Still_at_radisys.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------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 Thu Jul 11 2002 - 14:08:24 CDT
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