RE: "Headroom" in datafiles?

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Date: Wed, 16 Sep 2009 14:23:38 -0400
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I like the idea of ASM instances, but have not implemented one yet. As for file systems, ours don't grow extra ordinarily fast, so I just set autoextend on umlimited growth. And have a job in enterprise manager that polls all the databases on all servers once/day and emails if there is a tablespace where all the datafiles are greater than 30Gbs (8K block). Then I add another datafile.  

SysAdmin monitors and grants space on the box (san). So my datafiles are always basically full, (autoextending), so I just monitor there size as described. Works for me, and is very simple.  

Joel Patterson
Database Administrator
904 727-2546

[] On Behalf Of Taylor, Chris David Sent: Wednesday, September 16, 2009 11:27 AM To: ''
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.


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


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.  


Chris Taylor

Sr. Oracle DBA

Ingram Barge Company

Nashville, TN 37205

Office: 615-517-3355

Cell: 615-354-4799


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Received on Wed Sep 16 2009 - 13:23:38 CDT

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