RE: dba_extents and dba_segments
- From: "Ric Van Dyke" <ric.van.dyke@xxxxxxxxxx>
- To: <genegurevich@xxxxxxxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 10 May 2007 00:06:09 -0500
On my little test database the issues seems to be that dba_segments
shows segments in the recycle bin (BIN$ segment names) but dba_extents
doesn't. This little test just shows for table type segments which were
the one segment type with the most difference in my database.
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select segment_name, sum(bytes) from dba_segments
2 where segment_type='TABLE' group by segment_name
3 minus
4 select segment_name, sum(bytes) from dba_extents
5 where segment_type='TABLE' group by segment_name
6 /
SEGMENT_NAME
SUM(BYTES)
------------------------------------------------------------------------
--------- ---------------
BIN$/3CMRcOqT02P1xIJLb19Ng==$0
65536
BIN$/Xwbg4BFT1y9TIkhXUZd5Q==$0
65536
BIN$2sKa4lyTSE6apkmjIa7x8w==$0
65536
BIN$6RYZ9onvR523E6fhLcyeGg==$0
65536
BIN$ATwCYw1hQY660ges9Ryvqg==$0
65536
<more rows here>
-----------------------
Ric Van Dyke
Hotsos Enterprises
-----------------------
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of
genegurevich@xxxxxxxxxxxxxxxxxxxxx
Sent: Wednesday, May 09, 2007 4:34 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: dba_extents and dba_segments
Hi all:
I am very confused by the following 2 SQLs which I have ran against
oracle
10.2.0.3. I have been under impression
that dba_Extents is a rollup of the dba_extents and therefore these two
SQLs should return the same results.
This however does not seem to be the case. Does anyone know what is the
reason for this?
SQL> select sum(bytes/1024)/1024 from dba_extents where tablespace_name
=
'CCS_X_017';
SUM(BYTES/1024)/1024
--------------------
22200
1* select sum(bytes/1024)/1024 from dba_segments where tablespace_name
=
'CCS_X_017'
SQL> /
SUM(BYTES/1024)/1024
--------------------
2400
thank you
Gene Gurevich
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