How to free up space in Tablespace?

My SQL is quite decent but not perfect.
I'm using the following sql query to find out the tablespace's free space:
select b.tablespace_name, tbs_size SizeMb, a.free_space FreeMb
from (select tablespace_name, round(sum(bytes)/1024/1024 ,2) as free_space
from dba_free_space
group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024 as tbs_size
from dba_data_files
group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name;
I can see that one tablespace (custom made) is using up a lot of space so i want to free up some space. How can i do that?
I tried the following but still when running that query it still outputs the same:
- delete rows (tried using both delete & truncate commands) from schemas (tables) that belong to that tablespace
- drop unused schemas (tables) that belong to that tablespace
even tried disconnecting my session and reconnecting again but running that query still returns teh same results :s
Help much appreciated!
regards,
cheers

911802 wrote:
My SQL is quite decent but not perfect.
I'm using the following sql query to find out the tablespace's free space:
select b.tablespace_name, tbs_size SizeMb, a.free_space FreeMb
from (select tablespace_name, round(sum(bytes)/1024/1024 ,2) as free_space
from dba_free_space
group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024 as tbs_size
from dba_data_files
group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name;
I can see that one tablespace (custom made) is using up a lot of space so i want to free up some space. How can i do that?
I tried the following but still when running that query it still outputs the same:
- delete rows (tried using both delete & truncate commands) from schemas (tables) that belong to that tablespace
- drop unused schemas (tables) that belong to that tablespace
even tried disconnecting my session and reconnecting again but running that query still returns teh same results :s
Help much appreciated!
regards,
cheersOracle NEVER shrinks datafiles automagically.
You must do so manually.
http://www.lmgtfy.com/?q=oracle+shrink+datafile

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How can free + used space tbs size, can someone explain

Hi Gurus
Can someone explain this, How can free + used space in a tablespace can be greater than size of a tablespace. What am I missing here . Thanks a lot .
I am on 10.2.0.1, HP-UX
14:38:52 SQL> select owner,sum(bytes), sum(BYTES) /1024/1024 "MB" from dba_segments where tablespace
name='USERDB1ADATA' group by owner;
OWNER SUM(BYTES) MB
USERDB1A 839680000 800.78125
1 row selected.
14:40:42 SQL> select bytes, BYTES /1024/1024 "MB" from dba_data_files where tablespace_name='USERDB1
A_DATA';
BYTES MB
3758096384 3584
1 row selected.
14:40:42 SQL> select sum(bytes) , sum(BYTES) /1024/1024 "MB"from dba_free_space where tablespace_nam
e='USERDB1A_DATA';
SUM(BYTES) MB
3067412480 2925.3125
1 row selected.
14:40:43 SQL> select 839680000 + 3067412480 "used + free space" from dual;
used + free space
3907092480
1 row selected.
New DBA

Good point, Howard, about the recycle bin. So I cleaned up, recreated the table, filled it, dropped it but did not purge it, and ...
SQL> create table test.x tablespace test as select * from dba_objects where 1=2;
Table created.
SQL> insert into test.x select * from dba_objects;
12617 rows created.
SQL> commit;
Commit complete.
SQL> drop table test.x;
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SQL> with
2 dbf_size as (select sum(bytes) size_
3                 from dba_data_files where tablespace_name='TEST'),
4 dbf_free as (select sum(bytes) free_
5                 from dba_free_space where tablespace_name='TEST'),
6 dbf_used as (select sum(bytes) used_
7                 from dba_segments where tablespace_name='TEST')
8 select size_, free_, used_, (size_ - free_ - used_) left_
9         from dbf_size, dbf_free, dbf_used
10 /
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   5242880    5177344    2162688   -2097152
SQL>and then I played around with my SQL and came up with
WITH
dbf_size AS (SELECT SUM(bytes) size_
               FROM dba_data_files
              WHERE tablespace_name='TEST'),
dbf_free AS (SELECT SUM(bytes) free_
               FROM dba_free_space
              WHERE tablespace_name='TEST'),
dbf_used AS (SELECT SUM(bytes) used_
               FROM dba_segments
              WHERE tablespace_name='TEST'),
dbf_fbin AS (SELECT SUM(bytes) fbin_
               FROM dba_segments
              INNER JOIN
                    dba_recyclebin
                 ON (tablespace_name=ts_name
                     AND segment_name=object_name)
              WHERE tablespace_name='TEST')
SELECT      size_, -- tablespace size
     free_, -- free space reported
     used_, -- segment space used
     fbin_, -- segment space in recycle bin
     (size_ - free_ - used_ + fbin_) left_ -- 64K overhead per data file
FROM      dbf_size, dbf_free, dbf_used, dbf_fbin
/which does
SQL> WITH
2 dbf_size AS (SELECT SUM(bytes) size_
3                 FROM dba_data_files
4                WHERE tablespace_name='TEST'),
5 dbf_free AS (SELECT SUM(bytes) free_
6                 FROM dba_free_space
7                WHERE tablespace_name='TEST'),
8 dbf_used AS (SELECT SUM(bytes) used_
9                 FROM dba_segments
10                WHERE tablespace_name='TEST'),
11 dbf_fbin AS (SELECT SUM(bytes) fbin_
12                 FROM dba_segments
13                INNER JOIN
14                      dba_recyclebin
15                   ON (tablespace_name=ts_name
16                       AND segment_name=object_name)
17                WHERE tablespace_name='TEST')
18 SELECT     size_,
19     free_,
20     used_,
21     fbin_,
22     (size_ - free_ - used_ + fbin_) left_
23    FROM     dbf_size, dbf_free, dbf_used, dbf_fbin
24 /
     SIZE_      FREE_      USED_      FBIN_      LEFT_
   5242880    5177344    2162688    2162688      65536
SQL> alter tablespace test add datafile 'C:\ORACLE\ORADATA\XE\TEST2.DBF' size 5m;
Tablespace altered.
SQL> WITH
2 dbf_size AS (SELECT SUM(bytes) size_
3                 FROM dba_data_files
4                WHERE tablespace_name='TEST'),
5 dbf_free AS (SELECT SUM(bytes) free_
6                 FROM dba_free_space
7                WHERE tablespace_name='TEST'),
8 dbf_used AS (SELECT SUM(bytes) used_
9                 FROM dba_segments
10                WHERE tablespace_name='TEST'),
11 dbf_fbin AS (SELECT SUM(bytes) fbin_
12                 FROM dba_segments
13                INNER JOIN
14                      dba_recyclebin
15                   ON (tablespace_name=ts_name
16                       AND segment_name=object_name)
17                WHERE tablespace_name='TEST')
18 SELECT     size_, -- tablespace size
19     free_, -- free space reported
20     used_, -- segment space used
21     fbin_, -- segment space used in recycle bin
22     (size_ - free_ - used_ + fbin_) left_
23    FROM     dbf_size, dbf_free, dbf_used, dbf_fbin
24 /
     SIZE_      FREE_      USED_      FBIN_      LEFT_
10485760   10354688    2162688    2162688     131072Message was edited by:
Hans Forbrich
Cleaned up the script and tested with second data file added to verify LMT overhead.

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I am a volunteer. I am not an HP employee.
To say THANK YOU, press the "thumbs up symbol" to render a KUDO. Please click Accept as Solution, if your problem is solved. You can render both Solution and KUDO.
The Law of Effect states that positive reinforcement increases the probability of a behavior being repeated. (B.F.Skinner). You toss me KUDO and/or Solution, and I perform better.
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Reinstalling Lion/Mountain Lion Without Erasing the Drive
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Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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How to free up space in Tablespace?

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