Managing TEMP tablespace

Hi Folks,
My temp tablespace is 100% full...what should i do? Pls keep in mind that the Auto Exted is ON & this is a 24x7 DB.
Please advice.

Sometime it really difficult to decide between temp tablespace or tempfile..
We also running 24*7 and customer make their own code to duplicate scheme using their Java code .
What happen is , some scheme is really big and sometime we allocate 12gig for database size of 20. because of 1 scheme which is big enough. 10 gig.
We did encounter lack of space after we increase their tempfile and we shrink their tempfile again to gain more space...
I don't think this is a good way..but till now i haven't find out a best way to handle it.

Similar Messages

Temp Tablespace Extent Management and workarea_size_policy / sort_area_size

So, in the past (8i etc) we used to size temporary tablespace like (n*sort_area_size) + db_block_size.
Now in 9i / 10g we have the workarea_size_policy setting and pga_aggregate_target. How would we set extent sizes for the temporary tablespace? We let Oracle control the areasize parameters on the fly.
Any suggestions out there? Typically, I like 1MB for no particular reason other than it matches my stripe size on the underlying disk. However, oracle will only write in chunks of your sort_area_size.
Are there any guidelines out there where we can guess at what Oracle will use for the Sort_area_size?
Thanks,
BradW

Thanks. I realize that. The only thing I was wondering about is what to set the extent sizes to be for the locally managed temp tablespace.
I was curious what Oracle will set the sort_area_size to be during run time with in the PGA aggregate we specify....
Just curious on the internal mechanisms so that I can tweak my temp tablespace a little bit.
Thanks,
BradW

TEMP tablespace is always full in Enterprise Manager

The TEMP tablespace is always (99.99%) full in Enterprise Manager console. How can I release it and check it?

Yes, Kamal did give the answer. owever, it still remains confusing to most people.
The temp tablespace, like all tablespaces, is used to hold SEGMENTS. There are several kinds of temporary segments, including sort segments and segments for global temporary tables.
WHen a segment is allocated, it takes time to find the blocks that are free and to format those blocks.
Oracle's performance measure to counter the cost of finding and formatting free blocks is to leave the segment allocated at that kind of block. When a session terminates, any temprary segments it holds will be released to the free pool of 'that type of temprary segment', and another session can then (as you say) reuse the space.
Still, this is frustrating for the new DBA who has not read the concepts manual and not searched the forum on 'v$sort' or 'temporary tablespace usage'.
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14220/logical.htm#sthref399

TEMP tablespace getting full while inserting a CLOB in Trigger

We have a Oracle 10g (10.2.0.4.0) DB on a Solaris 9 box which also runs our J2EE web-service application on Weblogic 8sp6 server.
We get around 220K web-service requests from upstream callers daily to insert data in the main table, say TABLE1, which has daily partitions on a date column. This table has around 21 columns out of which 1 is a CLOB column.
Now this table has an AFTER INSERT trigger which calls a package procedure to insert the same record into another table, say TABLE2.
From Java application insert statement in executed in below format using a weblogic jdbc connection pool :
INSERT INTO TABLE1(COLUMN1, COLUMN2, ........., CLOB_COLUMN,........, COLUMN21) VALUES (:1, :2, :3, :4, :5, :6, :7, :8, :9, :10, :11, :12, :13, :14, :15, :16, :17, :18, :19, :20);
Clob object is prepared in application using ojdbc14.jar.
We are observing a strange issue here. The TEMP tablespace utilization keeps on growing as more and more inserts are executed by application and after ~125K inserts the TEMP tablespace gets full and we start getting ORA-01652 error.
On further analysis we could see that there are only 7-10 session being maintained but as more and more inserts happen TEMP tablespace utilization goes on increasing for each of these sessions.
When we tried with inserting just few records and then watching the session details in v$session_wait then we could see that it is in INACTIVE state and waiting for the event ‘SQL*Net message from client’. This does not seem correct as the session has successfully inserted the data and committed the transaction and we can see the data in the tables as well.
The confusing thing here is when we modify the trigger to pass blank string('' ) instead of the CLOB column to TABLE2 then this issue does not occur. All 200K records are inserted properly and TEMP tablespace utilization also keep always below 1%.
Can you please help us in solving this issue. Is this related to any oracle issue?
Inside the package we have tried using DBMS_COPY statement to copy the CLOB column after insert but still same result.
Code for reference:
Trigger:
=====================================
CREATE OR REPLACE TRIGGER trg
AFTER INSERT OR UPDATE
ON TABLE1
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
IF (:NEW.date_col > SYSDATE - 2)
THEN
IF (:NEW.cat IN (1001, 1002))
THEN
pkg.process_change
     (:NEW.COLUMN1,
          :NEW.COLUMN2,
          :NEW.CLOB_COLUMN,
FLAG
END IF;
END IF;
END;
=====================================
Package:
=====================================
procedure PKG.Process_change(
p_COLUMN1 number,
p_COLUMN2 varchar2,
p_CLOB_COLUMN clob,
flag boolean
) is
v_watermark pls_integer;
v_type varchar2(1);
begin
if (flag) then
v_type := 'U';
else
v_type := 'I';
end if;
select t_seq.nextval into v_watermark from dual;
insert into TABLE2(
COLUMN1 number,
COLUMN2 varchar2,
CLOB_COLUMN clob,
watermark,
dml_type
)values (
p_COLUMN1 number,
p_COLUMN2 varchar2,
p_CLOB_COLUMN clob,
v_watermark,
v_dml_type
end;
=====================================

My first thought on reading your post is that not only are you using a database version that is now so old it is in extended support and even then not even the most recent patchset for it.
The first thing I would do is move to 11gR2 and if you can't do that at least get to 10.2.0.5 and apply CLOB relevant patches as well.
Same goes for your operating system. Solaris 9 is ancient: So move to 10 which has vastly improved memory management.
To help you further it would be really valuable to know the table layout. For example is this a heap table or an IOT? Is it partitioned? Is this RAC? What size are the CLOBs? Are they stored in-line? Chunk size? etc.
This page should start you down the right road:
http://docs.oracle.com/cd/B19306_01/appdev.102/b14249/adlob_tables.htm#sthref204
But I am also wondering why you would use a trigger to, as you say, "insert the same record into another table." This description is a poster child for "bad design."

Shrinking a Locally Managed Temporary Tablespace

So, even thoguh the documentation is pretty clear about how to use this feature, I cannot get it to do what I expect it to do for me.
And that would be shrinking the tempfile ;)
Now lets face it, I have a large tempfile and want to resize it without restarting the database:
C:\Users\Administrator>sqlplus / as sysdba
SQL*Plus: Release 11.2.0.2.0 Production on Di Nov 20 05:49:59 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Release 11.2.0.2.0 - 64bit Production
SQL> select file_name
, ceil(bytes / 1024 / 1024) "size MB"
from dba_temp_files
FILE_NAME size MB
R:\MXVC01\TEMP01.DBF 31,231
SQL> select su.username
, ses.sid
, ses.serial#
, su.tablespace
, ceil((su.blocks * dt.block_size) / 1048576) MB
from v$sort_usage su
, dba_tablespaces dt
, v$session ses
where su.tablespace = dt.tablespace_name
and su.session_addr = ses.saddr
USERNAME SID SERIAL# TABLESPACE MB
VPXADMIN 15 15 TEMP 14
VPXADMIN 17 5 TEMP 1,203
VPXADMIN 17 5 TEMP 1
VPXADMIN 18 3 TEMP 7
VPXADMIN 19 3 TEMP 1
VPXADMIN 144 3 TEMP 1
VUMADMIN 156 2597 TEMP 1
7 rows selected.
Or this one:
SQL> select tablespace_size/1024/1024 "tablespace_size mb"
, allocated_space/1024/1024 "allocated_space mb"
, free_space/1024/1024 "free_space mb"
from dba_temp_free_space
tablespace_size mb allocated_space mb free_space mb
31230,9922 1228,99219 30002
Documetation from here: http://docs.oracle.com/cd/E11882_01/server.112/e25494/tspaces007.htm#ADMIN12353
+"Shrinking a Locally Managed Temporary Tablespace+
+Large sort operations performed by the database may result in a temporary tablespace growing and occupying a considerable amount of disk space. After the sort operation completes, the extra space is not released; it is just marked as free and available for reuse. Therefore, a single large sort operation might result in a large amount of allocated temporary space that remains unused after the sort operation is complete. For this reason, the database enables you to shrink locally managed temporary tablespaces and release unused space.+
+You use the SHRINK SPACE clause of the ALTER TABLESPACE statement to shrink a temporary tablespace, or the SHRINK TEMPFILE clause of the ALTER TABLESPACE statement to shrink a specific tempfile of a temporary tablespace. Shrinking frees as much space as possible while maintaining the other attributes of the tablespace or tempfile. The optional KEEP clause defines a minimum size for the tablespace or tempfile.+
+Shrinking is an online operation, which means that user sessions can continue to allocate sort extents if needed, and already-running queries are not affected.+
+The following example shrinks the locally managed temporary tablespace lmtmp1 to a size of 20M.+
+ALTER TABLESPACE lmtemp1 SHRINK SPACE KEEP 20M;+
+The following example shrinks the tempfile lmtemp02.dbf of the locally managed temporary tablespace lmtmp2. Because the KEEP clause is omitted, the database attempts to shrink the tempfile to the minimum possible size.+
+ALTER TABLESPACE lmtemp2 SHRINK TEMPFILE '/u02/oracle/data/lmtemp02.dbf';"+
OK, lets do it:
SQL> alter tablespace temp shrink tempfile 'R:\MXVC01\TEMP01.DBF';
alter tablespace temp shrink tempfile 'R:\MXVC01\TEMP01.DBF'
ERROR at line 1:
ORA-03214: File Size specified is smaller than minimum required
It seems there is a bug? Should I report it, or is it the expected behaviour?
Now lets try this one:
SQL> alter tablespace temp shrink tempfile 'R:\MXVC01\TEMP01.DBF' keep 2048M;
Tablespace altered.
SQL> select file_name
, ceil(bytes / 1024 / 1024) "size MB"
from dba_temp_files
FILE_NAME size MB
R:\MXVC01\TEMP01.DBF 31,231
So .... this lasts about *10 minutes*, and nothing changes?
It seems there is a bug? Should I report it, or is it the expected behaviour?
Could someone enlighten me, what this SHRINK is actually doing?
Is it worth to report this as bug, if not a software bug it is at least a documentation bug because it doesn't mention under which conditions it is working?
P.S.: OMG the posting looks terrible, who's the one to blame for this forum software where it is not possible to use fixed size fonts, or format paragraphs as code, or what about the fact that the forum software is using default SQLPlus output as META for some graphical lines?
Isn't this the forum for Oracle Database users?
Edited by: Gerrit Haase on 20.11.2012 13:44

So, you are kidding with me? No? Who are you?
How can I block users here? Is there a moderator present at this forum?
Maybe you read my initial post again?
I didn't look at the wrong place.
I reported you for general abuse.
SQL> define
DEFINE _DATE           = "20.11.12" (CHAR)
DEFINE CONNECTIDENTIFIER = "MXVC01" (CHAR)
DEFINE _USER           = "SYS" (CHAR)
DEFINE _PRIVILEGE      = "AS SYSDBA" (CHAR)
DEFINE SQLPLUSRELEASE = "1102000200" (CHAR)
DEFINE _EDITOR         = "Notepad" (CHAR)
DEFINE OVERSION = "Oracle Database 11g Release 11.2.0.2.0 - 64bit Production" (CHAR)
DEFINE ORELEASE = "1102000200" (CHAR)
SQL> SELECT * FROM dba_temp_free_space;
TABLESPACE_NAME TABLESPACE_SIZE ALLOCATED_SPACE FREE_SPACE
TEMP 3,2748E+10 1306517504 3,1443E+10
SQL> select TABLESPACE_SIZE/power(2,20), ALLOCATED_SPACE/power(2,20), FREE_SPACE/power(2,20) from dba_temp_free_space ;
TABLESPACE_SIZE/POWER(2,20) ALLOCATED_SPACE/POWER(2,20) FREE_SPACE/POWER(2,20)
31230,9922 1245,99219 29986
SQL> ALTER TABLESPACE temp SHRINK SPACE;
Tablespace altered.
SQL> select TABLESPACE_SIZE/power(2,20), ALLOCATED_SPACE/power(2,20), FREE_SPACE/power(2,20) from dba_temp_free_space ;
TABLESPACE_SIZE/POWER(2,20) ALLOCATED_SPACE/POWER(2,20) FREE_SPACE/POWER(2,20)
31230,9922 1244,99219 *29986*
R:\mxvc01>dir temp
Volume in drive R is Disk_R
Volume Serial Number is 248B-61D4
Directory of R:\mxvc01
20.11.2012 08:09 32.748.077.056 TEMP01.DBF
1 File(s) 32.748.077.056 bytes
0 Dir(s) 8.259.297.280 bytes free
SQL> alter tablespace temp shrink tempfile 'R:\mxvc01\TEMP01.DBF';
alter tablespace temp shrink tempfile 'R:\mxvc01\TEMP01.DBF'
ERROR at line 1:
ORA-03214: File Size specified is smaller than minimum required
*It clearly says that there is 29986 MB Space FREE and the above shrink space changes nothing and so does shrink tempfile:*
SQL> alter tablespace temp shrink tempfile 'R:\mxvc01\TEMP01.DBF';
alter tablespace temp shrink tempfile 'R:\mxvc01\TEMP01.DBF'
ERROR at line 1:
ORA-03214: File Size specified is smaller than minimum required
SQL> alter tablespace temp shrink tempfile 'R:\mxvc01\TEMP01.DBF' KEEP 20M;
Tablespace altered.
R:\mxvc01>dir temp
Volume in drive R is Disk_R
Volume Serial Number is 248B-61D4
Directory of R:\mxvc01
20.11.2012 08:24 32.748.077.056 TEMP01.DBF
1 File(s) 32.748.077.056 bytes
0 Dir(s) 8.259.280.896 bytes free
*... nothing changes, the tempfile isn't smaller now ...*

Restored coldbackup and having trouble with TEMP tablespace

Hi, i succesfully restored from a coldbackup on solaris.(oracle 9.2)
i can log on to database using toad, query the database, but when i try to take an export or something i got the error
EXP-00056: ORACLE error 1157 encountered
ORA-01157: cannot identify/lock data file 203 - see DBWR trace file
ORA-01110: data file 203: '/sun2int1/oracle92/app/oracle/product/9.2.1/oradata/TPRS/temp03.dbf'
ORA-06512: at "SYS.DBMS_LOB", line 424
ORA-06512: at "SYS.DBMS_METADATA", line 1140
ORA-06512: at line 1
EXP-00000: Export terminated unsuccessfully
when i did the restore, i simply renamed the datafiles and redo logs.
But i didnt rename the TEMP datafile, as you can not rename it with a "alter database rename file ..." command
so thats the problem!
i planned to create a new default temp. tablespace, and simply make it default and drop the other one. but it does not work!
i tried to execute:
CREATE TEMPORARY TABLESPACE temp4 TEMPFILE '/oracleAS/TPRS/oradata/TPRS/temp4.dbf' SIZE 5M REUSE AUTOEXTEND ON NEXT 1M MAXSIZE unlimited
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
create temporary tablespace temp01 tempfile '/oracleAS/TPRS/oradata/TPRS/temp01.dbf' size 100M;
but they all hang! i wait, but nothing happens! (and alert log does not log anything too)
and finally i tried to drop the default tablespace, and i couldnt drop it as i thought. (ORA-12906: cannot drop default temporary tablespace
So, im stuck and i beleive i have to RENAME the datafile for temporary tablespace. how can i do this?
Edited by: merope on Jun 9, 2009 11:32 AM

SQL> col file_name for a50
col status for a15
col tablespace_name for a15
col PROPERTY_VALUE for a20
select file_name,tablespace_name,bytes/1024/1024 as "SIZE_IN_MB",status,autoextensible from dba_temp_files;
SELECT PROPERTY_NAME,PROPERTY_VALUE FROM DATABASE_PROPERTIES where PROPERTY_NAME='DEFAULT_TEMP_TABLESPACE';
SQL> SQL> SQL> SQL> SQL> SQL> ERROR:
ORA-01157: cannot identify/lock data file 202 - see DBWR trace file
ORA-01110: data file 202: '/izmir1/oradbTPRS/temp1.db'
no rows selected
SQL>
PROPERTY_NAME PROPERTY_VALUE
DEFAULT_TEMP_TABLESPACE TEMP3
This is not the actual directory: /izmir1/oradbTPRS/temp1.db
it is the old location, but in the restored db, the temp1.db file is in some other directory
how can i rename this?
Edited by: merope on Jun 9, 2009 11:50 AM

Oracle 9i TEMP tablespace backup problem using RMAN!

Oracle8/8i whole backup is ok for our backup software(using RMAN without RC database), but for Oracle 9i, I get following error messages when backing up temp tablespace.
1. RMAN-20202: tablespace not found in the recovery catalog
2. RMAN-06019: could not translate tablespace name "TEMP"
I check some views of Oracle9i, and know some changes happen for temp tablespace in 9i, but how to deal with this problem. Any idea, please!

In 9i RMAN does not restore temporary datafiles. Instead, you should create them after your restore. I believe that Oracle is going to make a change to this in the next release of 9i and have RMAN create the temporary files. You can view the temporary datafiles @ v$tempfile.
I believe RMAN doesn't restore temporary files because they are locally managed and not in the control files. RMAN reads the controlfile of the target database to obtain info about backups, datafiles, etc.
Hope this helps.

Queries are not releasing temp tablespace in 11g standard edition

Queries are not releasing temp tablespace in 11g standard edition

user8928004 wrote:
Hi any one faced one issue.... please help
Patience, Grasshopper
You posted this follow-up a mere two minutes after your previous post.
This forum is not a chat line, and it is not paid support.
Everyone here has a job for which they are paid, and this forum is not it.
No one is responsible for monitoring it and giving a quick response.
Furthermore, it is a global forum. The person with the information you seek may very well live 20 time zones away from you and was going to bed just as you posted. He will not even see your post for several more hours.
Your original post went up in the middle of the night for half the world.
No one with the information you seek is deliberately withholding it until you sound sufficiently desperate.
======================================================
Please present evidence to backup your assertion that "Queries are not releasing temp tablespace"
From the very fine 11g Database Administrator's Guide, at Managing Tablespaces
Space Allocation in a Temporary Tablespace
You can view the allocation and deallocation of space in a temporary tablespace sort segment using the V$SORT_SEGMENT view. The V$TEMPSEG_USAGE view identifies the current sort users in those segments.
When a sort operation that uses temporary space completes, allocated extents in the sort segment are not deallocated; they are just marked as free and available for reuse.

Relation between temp tablespace and index creation

Hi,
I have my Oracle database (11gR1) on windows 2008 server R1 64 bit..
This is my development database. i have one table which has more than 2 billion rows , the problem i m facing here is while creating the index on this table i m getting temp segment error , while my temp tablespace size is 32 gb.
Here my doubt is :
1.What will happen in temp tablespace when index is created ? Relation between temp and index creation ?
2. how to create the index on a huge table?
3. What is the meaning og logging and no logging in INDEX creation .
4. how can we over come for these kind of problem and manage the temp TS..
Thanks & Regards,
Vikash Chauradia

add another tempfile?
1.What will happen in temp tablespace when index is created ? Relation between temp and index creation ?
index creation needs sort. how much depends on the size of the index.
2. how to create the index on a huge table?
create an interim (temporary? :)) huge temporary space for the very purpose.
http://docs.oracle.com/cd/B28359_01/server.111/b28310/indexes003.htm#i1006643
3. What is the meaning og logging and no logging in INDEX creation .
nologging means you the creation isnt in the logs so if you need to recover you cant get back to it. when using nologging in a prod env you might do it for performance during a period of heavy dml such as a large index creation and then backup afterwards. common enough.
4. how can we over come for these kind of problem and manage the temp TS..
current tempspace size =X
is X big enough? if yes, cup of tea, if no, make X bigger.
It doesnt matter what X is.

Maximum Temp tablespace size you've seen

DB version: 10.2.0.4
Our DB caters a retail application . Total DB Size of 3TB. Its is a bit of mix of both OLTP and Batch processing environment.
Our temp tablespace has 1 file and we had set the tempfile as AUTOEXTEND. Somehow its size has reached 25GB now !
We don't actually need this. Do we?
For a fairly busy DB of around 3TB size, what is the maximum temp tablespace size you've ever seen?
What is the maximum temp tablespace size you've ever seen for Big DB like Telecom, Banking?

The point about temp space is that your requirements are dynamic - the actively used area shrinks and grows.
Comparing apples with oranges, tempfile sizes on system where I am currently here amount to 50 GB but to be honest that's mainly due to a not insignificant number of pretty poor queries, run concurrently, with multipass operations, etc.
Kellyn Pedersen had an example of a process using 720GB here:
http://dbakevlar.com/?p=43
Whilst 25GB may not be earth shattering, a "large" temp area may perhaps be an indicator that you want to review some of your application code.
(What is "large"? "unusual" compared to what is "normal" for your system may be a better metric)
If you're using automatic pga memory management, then there's a limit to what each session can get, it may be that automatic work areas are not suitable for some of your code and some manual sizing is required to prevent operations spilling unnecessarily.
Also, inaccurate CBO estimates on your queries can lead to inaccurately sized work areas that then spill into temp.
There was a reminder of this in one of Randolf Geist's articles on hash aggregation:
http://oracle-randolf.blogspot.com/2011/01/hash-aggregation.html

TEMP tablespace

I see the TEMP tables space currently allocating 32GB and is 100% full.
Can someone give me a quick explanation of what this is for and if I can delete all data from this or re-create it?

#change temp tablespace
1. create new temp tablespace.
CREATE TEMPORARY TABLESPACE TEMP TEMPFILE
'/oracle/product/oradata/syslog/temp01.dbf' SIZE 2048M AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED
TABLESPACE GROUP ''
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
2. make it default
ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp;
3. drop the old one
drop tablespace temp2 including contents and datafiles.
Regards
Asif Kabir

CMS Repository Database Temp Tablespace Sizing

1. While running some large reports Business Objects (XI 3.1 FP2.7) received an ORA-01652 (Unable to extend temp segment in tablespace TEMP) error for the CMS repository. The CMS database is running in an independent Oracle instance with the auditing database, so only the Business Objects engine would be using the temp tablespace. All the report information is extracted from other database instances. This tablespace was sized at 4GB when this error occurred.
2. What is Business Objects using the CMS repository temp tablespace for? What are some sizing guidelines, should this tablespace be sized based on estimated report sizes, report rows, concurrent users, etc?

I'd say this has nothing to do with Webi processing and has everything to do with your Auditing DB.
Auding DB always growing and that's where that message comes.
Audit guide has more info on managing Audit DB.

How can drop TEMP tablespace

Hi,
Please help me

1) Create new temporary tablespcae
2) Chechk new temp tablespace in default
3) Drop tem pablespace
CREATE TEMPORARY TABLESPACE TEMP2 TEMPFILE’C:\ORACLE\10.2\ORADATA\PROD\temp2_01.dbf’ SIZE 100M AUTOEXTEND ON NEXT 256K
MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
ALTER DATABASE DEFAULT TEMPORARY TABLESPACE TEMP2;
DROP TABLESPACE temp INCLUDING CONTENTS AND datafiles

Storage parameter for Temp tablespace

Hi all,
Greetings of the day...
DB version is 10.2.0.4 ..Size of db is 550gb and in that temp tablespace is 40gb... daily and frequently we used to unable to extent temp segments...Saw the storage parameters of temp segments it has only 'EXTENT MANAGEMENT LOCAL UNIFORM SIZE 16777216'
Please suggest as how to define storage parameters for temp tablespace...Am able to find the query which uses temp segments...Just needed to know abt the storage parameters for it..
thanks,
baskar.l

CREATE TEMPORARY TABLESPACE TEMP TEMPFILE
'/u02/TSTLOG/temp01.dbf' SIZE 15360M AUTOEXTEND ON NEXT 100M MAXSIZE 32767M
TABLESPACE GROUP ''
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
Hope this will work.
Regards
Asif Kabir

Can you tell me why my temp tablespace can not release automatically?

when i up the database, the temp tablespace is used by o,but after some time it is used 99.99%,even all the task are finished,it is still used 99.99%,and can not release automatically!
who can tell me than is why?

Are you receiving an error ?
A "Temporary" tablespace manages it's allocation differently than a normal tablespace. The idea is to avoid the overhead of extent allocation, etc.
Take a look at:
http://asktom.oracle.com/pls/ask/f?p=4950:8:134496932618587661::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:108812348061,
or
http://asktom.oracle.com/pls/ask/f?p=4950:8:134496932618587661::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:1384603628260,
or (these URLs don't seem to be pasting correctly)
go to Ask Tom and search on "temporary" in the "page contains" option in advance search.
Ken

Managing TEMP tablespace

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