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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