RE: "Headroom" in datafiles?

    I have a touch of a problem with that. Assuming your using an 8K block size a data file is limited to 32GB and a bigfile tablespace is limited to one datafile. What do you do when the tablespace needs to grow beyond 32GB?  

Dick Goulet
Senior Oracle DBA/NA Team Lead
PAREXEL International  

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bobak, Mark
Sent: Wednesday, September 16, 2009 11:35 AM To: ChrisDavid.Taylor_at_ingrambarge.com; 'oracle-l_at_freelists.org' Subject: RE: "Headroom" in datafiles?

Hi Chris,  

Personally, I'm a big advocate of ASM and bigfile tablespaces. I put all my storage under ASM control, and when I create a database, I make sure all tablespaces are created as bigfile tablespaces. Tablespaces like SYSTEM, SYSAUX, TEMP, I usually set a reasonable max size. My application tablespaces are unlimited, and then I just monitor the amount of free space available in the diskgroup. When space is low, talk to storage admin, he gives me another chunk of raw disk, I add it to my diskgroup, and that's it. Each tablespace grows to the size it needs to be, I don't need to monitor individual databases/tablespaces, and life is simple.  

-Mark  

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Taylor, Chris David
Sent: Wednesday, September 16, 2009 11:27 AM To: 'oracle-l_at_freelists.org'
Subject: "Headroom" in datafiles?  

I'm curious how much "headroom" people like to maintain in their datafiles? We have a large data reorganization procedure underway as part of our DR discovery process and I was playing around with some ideas.  

I was thinking, we could allocate a fixed size for each datafile (say 32G for example) and not worry about space or autoextend until we reached some threshold.

OR

I could fix each datafile to have 10% free space at all times

OR

something similar.  

I think what bothers me is knowing that some of my datafiles are "99%" full for example while others are 5% full in the same database.  

Do any of you get bothered by datafiles being a certain % "full"?  

We've got gobs of disk space "right now" so I've been pushing this to the back burner for a while for coming up with a cohesive policy on datafiles.  

Thoughts?  

Chris Taylor

Sr. Oracle DBA

Ingram Barge Company

Nashville, TN 37205

Office: 615-517-3355

Cell: 615-354-4799

Email: chris.taylor_at_ingrambarge.com  

CONFIDENTIALITY NOTICE: This e-mail and any attachments are confidential and may also be privileged. If you are not the named recipient, please notify the sender immediately and delete the contents of this message without disclosing the contents to anyone, using them for any purpose, or storing or copying the information on any medium.  

--
http://www.freelists.org/webpage/oracle-l