RE: Controlling disk space usage

From: Reardon, Bruce (CALBBAY) <Bruce.Reardon_at_comalco.riotinto.com.au>
Date: Wed, 26 Sep 2001 18:55:24 -0700
Message-ID: <F001.0039A123.20010926184019@fatcity.com>

Sean,

We use Oracle on NT with autoextend.

We also have automated disk space remaining monitoring with notification to mobile phones.

However, I still configure the maxsize such that the sum of the maxsize on each disk is less than the available space on the disk.

Consider the following script as a simple way of measuring current and maximum per disk (if only it was easy to work out disk size within Oracle):

space_by_disk.sql
27-Sep-2001 , Bruce Reardon : Created.
Assumptions
That DB is on NT as uses first character of filename to group by disk name.

COLUMN curr_mb FORMAT 999,990.9
COLUMN max_mb FORMAT 999,990.9

select

   substr ( file_name ,1,1) disk,
   sum (bytes / 1024/1024) curr_mb ,
   sum (maxbytes / 1024/1024) max_mb
from

dba_data_files
group by

substr ( file_name ,1,1)
;

Regards,
Bruce Reardon

-----Original Message-----
Sent: Thursday, 27 September 2001 1:56

Sean,
I assume from your question that you are already using autoextend on your tablespaces.
I personally do not use that option and therefore the chance of a tablespace expanding above available disk space never occurs. However in the event of my running a massive insert or import when I was not sure how much space would be used I might use autoextend until the creation was over and then turn autoextend off
John
-----Original Message-----
Sent: 26 September 01 15:15

Wondering what folk out there do to manage disk space usage by tablespaces. Is it common/bad practice to have MAXSIZE unlimited and/or MAX_EXENTS set to

a value which if reached would be larger than disk capacity and therefore regular observation of space is required, or is there a better way to do this?

Sean :)
Data Base Administrator
Oracle 7.3.3, 8.0.5, 8.1.7 - NT, W2K
[0%] OCP Oracle8i DBA ---> End 2002 deadline =:-O [0%] OCP Oracle9i DBA

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Author: Reardon, Bruce (CALBBAY)
INET: Bruce.Reardon_at_comalco.riotinto.com.au

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