SearchOracle.com Brett Ogletree
02 Aug 2005
[Ed. note: This script is now corrected and has been tested on 18.104.22.168 and 22.214.171.124.0.]
I've seen a lot of scripts that tell you about all the tablespaces in a database, but very few show only the ones that are going to give you problems.
I've been using this script for a few years now and it has really saved me from dialing in at nights and on the weekends. I use it as a cursor for a procedure and have it build an e-mail and/or page notification that is sent to myself and others.
This script is useful because it drills down to what is going to give you a problem. I don't have a lot of time to wade through a reports to find out which tablespace is running out of space, this is short and sweet and lets me get on with my day. I've run the script on 8, 8i, and 9i. Just make sure you are using system or another user that can read the data dictionary.
SELECT space.tablespace_name, space.total_space, free.total_free,
ROUND(free.total_free/space.total_space*100) as pct_free,
ROUND((space.total_space-free.total_free),2) as total_used,
ROUND((space.total_space-free.total_free)/space.total_space*100) as pct_used,
(SELECT tablespace_name, SUM(bytes)/1024/1024 total_space
GROUP BY tablespace_name) space,
(SELECT tablespace_name, ROUND(SUM(bytes)/1024/1024,2) total_free, ROUND(MAX(bytes)/1024/1024,2) max_free
GROUP BY tablespace_name) free,
(SELECT tablespace_name, ROUND(MAX(next_extent)/1024/1024,2) max_next_extent
GROUP BY tablespace_name) NEXT
WHERE space.tablespace_name = free.tablespace_name (+)
AND space.tablespace_name = next.tablespace_name (+)
AND (ROUND(free.total_free/space.total_space*100) /*pct_free*/ < 10 OR next.max_next_extent > free.max_free)
Perry W. writes: "This script is based on an Oracle7 mentality. It does not provide valid data if autoextend is used for datafiles. The column max_bytes must be used to identify how large a datafile can *potentially* grow. He must also account for the fact some datafiles may have autoextend on and some may not. Also, a monitor for disk space available must also be included in the monitoring infrastructure. This is a rookie script in my opinion and can provide misleading results with autoextend turned on.