RE: Who is using my datafile
- From: "Mercadante, Thomas F (LABOR)" <Thomas.Mercadante@xxxxxxxxxxxxxxxxx>
- To: <adar666@xxxxxxxxxxxx>
- Date: Wed, 9 Jul 2008 08:55:52 -0400
Yechiel,
Find a table in your database that is using multiple extents/segments
and query these two views and you will figure it out. They are very
usefull in determining how Oracle has stored your object.
Tom
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Yechiel Adar
Sent: Wednesday, July 09, 2008 2:27 AM
Cc: ORACLE-L
Subject: Re: Who is using my datafile
I am a little confused here.
I thought that dba_segments contain information about space allocated to
objects and dba_extents contain the information about the space
allocation within each segments.
Now I find that:
select * from dba_segments where header_file = 7; return no rows while:
select * from dba_extents where file_id = 7; return some rows.
So, I am switching to check dba_extents to clear space in datafiles.
What is the purpose of dba_segments?
Adar Yechiel
Rechovot, Israel
Yechiel Adar wrote:
> I have a RAC on windows.
> Oracle 9206.
> OCFS.
>
> I have five datafiles that have nothing in them.
> I mean that select * from sys.seg$ where file# between 6 and 11 return
> nothing.
>
> When I tried to decrease the size of the datafiles I got: the file
> contain data beyond the space I want to decrease to.
> I thought that maybe there are some temporary segments but all the
> users use temp as their temporary tablespace.
>
> TIA
>
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