Re: dba_extents and dba_segments

That would be the behaviour I'd expect to be honest. A dropped segment is
still a segment, but its extents are available for reuse. Or am I just being
daft here.

Meanwhile a little search through the bug db on metalink reveals bug 5665912
and a whole raft of similar bugs. which may be relevant together with the
procedures

DBMS_SPACE_ADMIN.TABLESPACE_FIX_SEGMENT_EXTBLKS

DBMS_SPACE_ADMIN.TABLESPACE_REBUILD_BITMAPS

both of which are a bit of a surprise to me. There's a reasonable amount of
reading to do, but it rather looks to me as if the space information in
these various views can be inconsistent, or wrong, for a number of reasons.
(migration from previous version, parallel operations to name but two in
addition to the dropped objects issue).

cheers

Niall

On 5/10/07, Ric Van Dyke <ric.van.dyke@xxxxxxxxxx> wrote:


 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





--

http://www.freelists.org/webpage/oracle-l









--
Niall Litchfield
Oracle DBA
http://www.orawin.info

Other related posts: