RE: performance impact

Niall

   You have my attention! What is your platform and Oracle version.

Dennis Williams
DBA, 60%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Tuesday, April 29, 2003 4:37 PM
To: Multiple recipients of list ORACLE-L

I have been caught twice with datafiles that are *exactly* xGB in size by oracle bugs (read restore from backup because a datafile became 2^n gb in size). I no longer trust oracle to handle files 2^n gb in size where n is an integer. In addition If you are using locally managed tablespaces it would be smart to allocate 64kb (or even a whole MB) to the file size so that the extent bitmap can sit there. So I would go for

2049mb,
4097mb,
8193mb or
16395mb

You can obviously choose the more precise kb figure if required.

Niall
> -----Original Message-----
> From: root_at_fatcity.com [mailto:root_at_fatcity.com] On Behalf Of Roger Xu
> Sent: 28 April 2003 22:02
> To: Multiple recipients of list ORACLE-L
> Subject: performance impact
>
>
> For a 400 GB tablespace, which one is better?
>
> 1) 200 2GB datafiles
> 2) 100 4GB datafiles
> 3) 50 8GB datafiles
> 4) 25 16GB datafiles
>
> [64-bit Oracle 9i on Solaris 9]
>
> Thanks,
> >
> > Roger Xu
> > Database Administrator
> > Dr Pepper Bottling Company of Texas
> > (972)721-8337
> >
>
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Author: Niall Litchfield
  INET: niall.litchfield_at_dial.pipex.com

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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

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