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RE: resizing/moving datafiles for performance ??

From: Hately Mike <Mike.Hately_at_churchill.com>
Date: Fri, 19 Jul 2002 03:33:27 -0800
Message-ID: <F001.0049C6D6.20020719033327@fatcity.com>


Hi,
Assuming that all of the disk partitions are striped across all of the disk you probably won't see any performance difference wherever you put the files and whatever size you make them. At least nothing noticeable. If you can't change the disk layout maybe you can concentrate on scrutinising V$SQL to tune any queries that are generating too much disk activity.

Regards,
Mike Hately

-----Original Message-----
Sent: 19 July 2002 09:58
To: Multiple recipients of list ORACLE-L

Guys,

the DB is on 8.1.6 / Win2K.

there entire DB ( 33 tables and 110 indexes) is in USERS tablespace.
the USERS tablespace has only one datafile USERS.DAT of size 12GB.

it's on 8 * 10 GB HDD with RAID 5.

we are facing performance bottleneck now.

V$SESSION_WAIT shows many rows for DB FILE SCATTERED READ and DB FILE SEQUENTIAL READ.
all these events wait for USERS.DAT to be read. it's a highly read OLTP site.

So,will moving the table and index data to different tablespaces with relatively smaller datafiles ( say 1 GB ) improve performance ?
OR
since it is on RAID5 , will moving make any difference ?

10-20 MB of data gets added to the DB daily. if resizing/moving improves performance,what should be the size of my datafile ?

kindly give me a solution guys.
TIA.  



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Author: Hately Mike
  INET: Mike.Hately_at_churchill.com

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