Oracle-L: RE: # of datafiles per tablespace

From: Gene Sais <Gsais_at_co.palm-beach.fl.us>
Date: Tue, 05 Mar 2002 05:13:20 -0800
Message-ID: <F001.0041F63B.20020305051320@fatcity.com>

I use 10gb datafiles for a 1tb db and also back up using Legato. Thinking about using Rman :)

>>> lerobe_at_acxiom.co.uk 03/05/02 03:18AM >>> We use 4Gb datafiles here as the norm without any problems at all and those datafiles are all backed up with Legato. No problems whatsoever.

Lee

-----Original Message-----
Sent: 05 March 2002 03:33
To: Multiple recipients of list ORACLE-L

That being said is there anything wrong with having one 4G data file for a tablespace. I personally cannot think of any. There were the days when 2G was the limit but that sure isn't the case anymore.

The only thing I can think of is for backups. However, I am always going to backup on at least the tablespace level so if I have one file or multiple files I still need to get them all. I don't know if RMAN has some special feature that turns out it makes sense to backup just one data file of a tablespace that has multiple data files but I sure can't think of any good reason.

I just randomly picked RBS but I am seeing the same case on data tablespaces as well.

-----Original Message-----
Carmichael
Sent: Monday, March 04, 2002 6:29 PM
To: Multiple recipients of list ORACLE-L

no reason. I can see creating multiple files under those conditions only because you want to keep files to a specific size.

Now, I did once find that the rollback datafiles were a bottleneck on a system I had. So we built TWO rollback tablespaces, with datafiles on different mount points etc and the rollback segments divided between the two tablespaces.

cleared up that bottleneck like a dream

other than that though.. why?

Kimberly Smith <ksmith2_at_myfirstlink.net> wrote:
> OK, I know we had the debate already but lets have another go at it.
>
> Say you got a tablespace, lets call it RBS and its for rollbacks.
> Now, for what reason would you create a 500M file and 4 50M files
> for this puppy as opposed to just one file. I just cannot see the
> reasoning
> for this at all. None. Natta. Zilch.
>
> So educate me please if someone out there knows a legit reason they
> would do this.
>
> Lets assume for the sake of argument that disk size and mount point
> size is not a limitation. Space available to me on any one mount
> point
> is unlimited.
>
> ___________________________
> Kimberly Smith
> Portland, OR
> ksmith2_at_myfirstlink.net
>
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Author: Robertson Lee - lerobe
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Author: Gene Sais
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Received on Tue Mar 05 2002 - 07:13:20 CST