Query about Temporary Tablespaces

Why Data Manipulation Language (DML) locks are never acquired on the data of temporary tables? Any detailed explanations with justifications will be great. Thanks in advance.

918868 wrote:
Why Data Manipulation Language (DML) locks are never acquired on the data of temporary tables? Any detailed explanations with justifications will be great. Thanks in advance.each process only manipulates it own segments; so there is never any cross session contention.

Similar Messages

About Temporary Tablespace

Hi DBA Guru(s),
I have a general query about Temporary Tablespace that,
if we drop the temporary tablespace then out database will run or not and
also what will be the impact on database.
Please suggest.
Regards,
Rajeev Kumar

970371 wrote:
Hi DBA Guru(s),
I have a general query about Temporary Tablespace that,
if we drop the temporary tablespace then out database will run or not and
also what will be the impact on database.
Please suggest.
Regards,
Rajeev KumarDatabase can start without Temp Tablespace but it will not be good idea since because the system tbs is used for sort segment.

Query about Bigfile tablespace

What will be minimum size for a single data file for creating bigfile tablespace?

John Stegeman wrote:
why do you need to know? As far as I recall, it's pretty small (100k or less)"pretty small" is correct, but I think it may be a little over a megabyte in the latest versions of Oracle - I think I noticed Oracle reserving the 1st MB for the file space map quite recently.
Regards
Jonathan Lewis

How to view what is using up the temporary tablespace

Hi all
I am running into a problem - my temporary tablespace is being completely used up.
How would i find out what is using up this? Technically it has enough space to function properly but now we are getting 0 bytes free.
thanks!

There is nothing wrong if a temporary tablespace appears as full. It is very normal. I
For more information about temporary tablespace usage query V$SORT_USAGE and V$SORT_SEGMENT .
For more information go to this link
http://asktom.oracle.com/pls/ask/f?p=4950:8:14327914180898764224::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:374218170986

How do i know if my query using SORT_AREA_SIZE   or temporary tablespace ?

Good Morning Everyone !
My DB version is 10.2.0.1
I have large table exactly 3 million records.
SQL> select count(*) from tab1;
COUNT(*)
   300000
SQL> select * from tab1 order by no DESC;
sorting ... in process
300000 rows selected.
in Terminal 2 : I tried to find sorting details -   ( No rows selected - why ? )
SQL> select USERNAME , USER , TABLESPACE , SQL_ID from v$tempseg_usage ;
no rows selected
SQL> /
no rows selected
When i google i have seen this ;
If Oracle cannot do the sort in memory (SORT_AREA_SIZE initialisation parameter), space will be allocated in a temporary tablespace for doing the sort operation.
REF_LINK : TEMPORARY Tablespaces and TEMPFILES | Oracle FAQ
MY DOUBT QUESTION :   How do i know if my query using SORT_AREA_SIZE or temporary tablespace ?
Thanks in advance.

@ JohnWatson
I have seen some articles from ORA - FAQ. Good.
SQL> select USERNAME , USER , TABLESPACE , SQL_ID from v$tempseg_usage;
USERNAME                       USER   TABLESPACE                      SQL_ID
   SCOTT                               SYS          TEMP                            fh9vqgyd6m0d1
PGA management means that sorting only 300000 rows may well occur in memory
            Is this (3 million rows) - standard value for 10g version ?
Thanks JohnWatson

Temporary tablespace Query

Hi all,
I have a query that whether to create a separate temporary table space for all user's and set as there default tablespace or the temporary table space which is created while creating db can be set as default temporary tablespace for all user's. So what the effect of that

If your database have not any default temporary tablespace then system tablespace is going to be use.Therefore , it is better to user the default temporary tablespace.
the temporary tablespace which is created while creating db can be set as default temporary tablespace for all user's.Keep this temporary tablespace as default . your intention should be that you have a default temporary tablespace where user's sorting and other operations may take place . The default temporay tablespace may be created at db creation or you have created after the db creation ..
As far error concerned you don't have physical tempfile on disk .
Hope this may help you :)
--neeraj

Queries about Space Info of Temporary Tablespace

Hi
I want to know the free space, used space, total space of Temporary Tablespace,
and also how much space is currently using by different active sessions of Temporary Tablespace.
Oracle version is 9.2.0.1.0
Can any body send the links or queries regarding this.
Thanks,

This link might help http://www.orafaq.com/faqdba.htm#TEMPSPACE

Temporary tablespace is not being used

hello all,
we have oracle 10g 10.2.1.0 on windows server 2003 platform (32-bit). we have 24*7 database. we have OLTP with heavy transactions. last night we ran a report which is supposed to fetch more than 2500 rows and query include group by and order by clause.
i have rebuild all indexes on index tablespace, which were previously on users tablespace where my all data resides.
but it is taking too much long to generate report more that 40 minutes (expected 5 minutes) my SGA is set to 1.2 GB shared pool sixe is 500M and db_cache_size=400M. and when i check tablespace status from enterprise manager everytime , i see that temporary tablespace is never being used..it always shows that temporary tablespace usages 0.0 and i allocated 4 GB to temp tablespace and it is also default temporary tablespace.
what else i can do to force oracle to use temporary tablespaces??? it is not using for sorting also...thats why it is taking so long to generating report..
any suggestion would be appreciable..
thanks and regards
VD

vikrant dixit wrote:
we have oracle 10g 10.2.1.0 on windows server 2003 platform (32-bit). we have 24*7 database. we have OLTP with heavy transactions. last night we ran a report which is supposed to fetch more than 2500 rows and query include group by and order by clause.
i have rebuild all indexes on index tablespace, which were previously on users tablespace where my all data resides.
but it is taking too much long to generate report more that 40 minutes (expected 5 minutes) Are you saying that you tried rebuilding all your indexes because the report started to run slowly, or conversely that you rebuilt all the indexes and then the report ran slowly ?
If it's just a report that you could simply re-run, then all you have to do is re-run it and watch exactly where the time goes (you've been told about the 10046 trace already).
If it's a report that ran, and was tuned, regularly in the past then you presumably have the execution plan stored somewhere so you could even check the current execution plan compared to the old one to see if it has changed.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"There's no sense in being precise when you don't even know what you're talking about"
John von Neumann

ORA-03217: invalid option for alter of TEMPORARY TABLESPACE

Hi all
I have a database with 300 Users approximantely.
Suddenly I was reported about slowly connection and looked to my database. And I saw that Temporary tablespace with name MUVTEMP is 0% used and in it there is no .dbf file
Then I do ls on my data files directory and saw there MUVTEMP01.dbf!
But it's not using it. Then I want to add another .dbf file. It created this file physically but not joined it to my temporary tablespace.
Then I did it with Oracle EM, clicked on "Show SQL" and there was written
ALTER TABLESPACE "MUVTEMP"
ADD
DATAFILE '/home/oracle/OraHome1/oradata/linux/test.dbf' SIZE
5M
I run it from EM it gave this error
ORA-03217: invalid option for alter of TEMPORARY TABLESPACE
Then I run this SQL in sqlplus
ALTER TABLESPACE "MUVTEMP"
ADD
TEMPFILE '/home/oracle/OraHome1/oradata/linux/test.dbf' SIZE
5M
it created file physically, but I can't see this file as temporary tablespace's file. It's not using....
Where is my mistake???
Thanks...

Hi,
try this query:
select s.sid || ',' || s.serial# sid, s.username, u.tablespace, substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)) sql_text,
round(((u.blocks*p.value)/1024/1024),2) size_mb
from v$sort_usage u, v$session s, v$sqlarea a, v$parameter p
where s.saddr = u.session_addr
and a.address (+) = s.sql_address
and a.hash_value (+) = s.sql_hash_value
and p.name = 'db_block_size'
group by s.sid || ',' || s.serial#, s.username, substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)), u.tablespace, round(((u.blocks*p.value)/1024/1024),2);

Temporary Tablespace not shrinking automatically after restarting the DB.

I had a Database with 2GB tempfile. It gave me an error that it's unable to extend the temporary segment. I added a new tempfile of 500MB. Within a few min the new file was filled. In process of shrinking the temporary files, I shutdown the DB, and restarted it. But the Tempfiles were still filled to the max. I still don't understand why? Then I attached a new tempfile of 1GB to the Temp Tablespace, but it didn't use the new tempfile. I repeated the restart process again but still the output was same.
1. Both datafiles were filled to the max
2. It didn't use the new (3rd) attached tempfile.
Finally I've created a new tablespace with new Tempfiles, and it's working now. But I'm still confused. Please suggest me with the possibilities. How can i shrink the Temporary Tablespace/Tempfiles.
Thanks & Regards
Vikas Verma
Manager (IT) / Sr. DBA
Hero Cycle Group,
India

It all depends from what you understand by shrinking:
If you would like to shrink tempfile for tablespace I would suggest using following procedure:
Find out to which size you can shrink tempfile
select extent_size,current_users,total_extents,used_extents,free_extents
from v$sort_segment
where tablespace_name='TEMP';
alter database tempfile 'XXXX' resize YYM;
YY is the size which can be found by above query.
But Ithink you are more interested in following procedure:
create new
make this new one the default temporary tablespace for the database
drop old
ps. Yoogesh ask you about DB version
you can find bd version by:
select *
from v$version
select *
from product_component_version
Best Regards
Krystian Zieja / mob

Undo Tablespace and Temporary Tablespace - autoextend ?

- In general, should I allow the Undo Tablespace to grow (autoextend)?
- In general, should I allow the Temporary Tablespace to grow (autoextend)?

The size of undo tablespace should always keeps in mind otherwiase you eill get ORA-1555 or out of space errors.
This paper is to help DBA’s in calculating the size of UNDO tablespace by using a simple formula.
It is tough to know about the number of transactions and subsequently number of rows changed per second.
So I suggest having a “big undo tablespace” to start with and based on load, after doing some calculations and resize your UNDO tablespace.
In my case one of the applications was going to production (live), and I had no idea that how many transactions will happen against this database. All what I was told that there will be optimum (transactional) activity on this database.
So I started with UNDO tablespace with size of 3GB and datafiles with autoextend “on” .
Note:
In production, you must be very careful in using this (autoextend on) as the space may grow to inifinity very fast. So my advice is either dont use this option, or use with "maxsize" or continuously monitor space (which is tough).
I month later, I noticed the activity from V$undostat.
Here is the step by step approach:
Step 1: Longest running query.
SQL> select max(maxquerylen) from v$undostat;
MAX(MAXQUERYLEN)
1793
This gives you ideal value for UNDO_RETENTION. To be on the safer size you should add few more seconds to get the right value. So in my case, the size of undo retention should be say 2000 secs.
Step 2: Size of UNDO tablespace.
Size of UNDO needed = UNDO_RETENTION x [UNDO block Generation per sec x DB_BLOCK_SIZE] + Overhead(30xDB_BLOCK_SIZE)
Out of these we know UNDO_RETENTION and DB_BLOCK_SIZE
All we need is to find out “UNDO Blocks per second”
Which can be easily fetched from v$undostat
SQL> SELECT (SUM(undoblks))/ SUM ((end_time - begin_time) * 24*60*60) "UPS"
2 FROM v$undostat;
UPS
8.11985583
V$undostat stores data for every 10 mins and begin/end times are start/end time of those intervals. We multiplied it with 24*60*60 because the difference between two dates will be in days and to get to seconds, we need it to multiply with 24hrs*60mins*60secs
So now we have all the values needed.
Undo size needed = [8.12 x 2000 x 8192] + [30 x 8192] = 133283840 bytes = 127.11 MB

Drop a temporary tablespace

Hi all
I have created a temporary tablespace temp01 and assign it as the default temporary tablespace for the database (10.0.2.0)
How can I drop it without changing the default temporary tablespace?
thanks for help

phaeus wrote:
Hello,
create a new temporary tablespace. Make it to your default database temp tablespace and then you can drop the old one.
A couple of thoughts I'd want to check on that - based on memories of problems in the dim and distant past.
If you take this approach, do you still have to worry about users who have already got the dropped tablespace associated with their temp tablespace in dba_users ? Memory says they'll either get an error message, or they'll fall back to SYSTEM despite there being a new default.
One of the reasons for creating tablespace groups for temporary tablespaces is that you can assign a tablespace group to a user, and then invisibly create and drop temporary tablespaces in that group without having to adjust the users' details. But there used to be a bug that resulted in excessive hits on dc_tablespaces if you did this, and extreme numbers of executions of a query against ts$ (or maybe file$).
Regards
Jonathan Lewis

Although my temporary tablespace is enough space,the error occurs ORA-01652

Hello,
Although my temporary tablespace is enough space ,i am taking an error ORA-01652 and some dbfs in the tablespace are looks like as offline and it’s size looks like as 0 byte.
So that i am changing status of these datafiles to online with this command as follows;
ALTER DATABASE TEMPFILE '/QDBP/q023/q023/temp/qt_lm_tmp01.dbf' ONLINE;
Also, The disk that exist these datafiles was 0 in availibility.
When i issued the command df –k as follows
Filesystem kbytes used avail capacity Mounted on
/dev/vx/dsk/qdbpdg/volq23 20971520 20971520 0 100% /QDBP/q023
is pointed.
And then i have released space from disk
The current review is
/dev/vx/dsk/qdbpdg/volq14 157286400 21731141 127083885 15% /QDBP/q014
My queries and results are for the hint of about the problem:
SELECT A.tablespace_name TABLESPACE, D.mb_total,
SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_free
FROM v$sort_segment A,
SELECT B.NAME, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total
FROM v$tablespace B, v$tempfile C
WHERE B.ts#= C.ts#
GROUP BY B.NAME, C.block_size
) D
WHERE A.tablespace_name = D.NAME
GROUP BY A.tablespace_name, D.mb_total;
TABLESPACE |MB_TOTAL| MB_USED| MB_FREE
QT_LM_TMP |61440 |12| 61428 --temporary
TS_TEMP_SDPA |15360 |0| 15360 –temporary
Separately,i want to see you a view about alert log like points below.
KCF: write/open error block=0x1b6e0a online=1
file=3 /QDBP/q014/q014/temp/qt_lm_tmp03.dbf
error=27063 txt: 'SVR4 Error: 28: No space left on device
Additional information: -1
Additional information: 8192'
Automatic tempfile offline due to write error on
file 3: /QDBP/q014/q014/temp/qt_lm_tmp03.dbf
With sum,i have some question like below:
1)Although there is enough space on temporary tablespace why i take error ORA-01652?
2)Although there is enough space on temporary tablespace why databasefiles have offline status suddenly?
3) is it important fully rate of disk on operating system if there is enough space on temporary tablespace which has extend properties.
Best regards
Oya YALÇIN

Hi,
i don't make tablespaces offline mode.But neverthless i don't understant although there is enough space on tablespace why tablespaces are being offline status mode itself?
When i look at ‘ select file_name,status from dba_temp_files ‘ query on the database now.The result is like below;
FILE_NAME|STATUS
/QDBP/q023/q023/temp/qt_lm_tmp01.dbf|AVAILABLE
/QDBP/q023/q023/temp/qt_lm_tmp02.dbf|AVAILABLE
/QDBP/q014/q014/temp/qt_lm_tmp03.dbf|AVAILABLE
/QDBP/q023/q023/temp/ts_temp_sdpa01.dbf|AVAILABLE
/QDBP/q023/q023/temp/ts_temp_sdpa02.dbf|AVAILABLE
/QDBP/q014/q014/temp/qt_lm_tmp04.dbf|AVAILABLE
/QDBP/q014/q014/temp/qt_lm_tmp05.dbf|AVAILABLE
But when i look at first 3 dbf by orderly from tab of scripts about tablespaces on toad tool
i see that like below;
ALTER DATABASE TEMPFILE '/QDBP/q023/q023/temp/qt_lm_tmp01.dbf' OFFLINE;
ALTER DATABASE TEMPFILE '/QDBP/q023/q023/temp/qt_lm_tmp02.dbf' OFFLINE;
ALTER DATABASE TEMPFILE '/QDBP/q014/q014/temp/qt_lm_tmp03.dbf' OFFLINE;
And their size is look like 0 .
Regards
Oya.

After deleting files of default temporary tablespace.

I'm just doing "Practice 7" in "Administration Workshop II, Students Guide".
According to this guide I've deleted (at OS level) files of default temporary tablespace. I then restart the database and poerformed query that involves sorting of data.
According guide I should receive a message:
ORA-01157: cannot indetify/lock data file 201 - see DBWR trace file
ORA-01110: data file 201: /home/oracle/oracle/oradata/temp1.dbf
However, in my database the query runs without any problems. I then looked if the temp1.dbf file exists and it does. I suppose it was automaticaly created at database startup.
Could you tell my why is the difference in work of my database in comparison to that in student guide?
Thanks in advance.
Jacek

In trace file I have this:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000
External cache id: 0x0 0x0 0x0 0x0
Absolute fuzzy scn: 0x0000.00000000
Recovery fuzzy scn: 0x0000.00000000 01/01/1988 00:00:00
Terminal Recovery Stamp 01/01/1988 00:00:00
TEMP FILE #201: External File #401
ERROR: Record not owned by caller (7, 1)
(name #8) /home/oracle/oracle/oradata/orcl/temp01.dbf
creation size=2560 block size=8192 status=0x1c head=8 tail=8 dup=1
tablespace 3, index=5 krfil=1 prev_file=0
unrecoverable scn: 0x0000.0006cec7 11/20/2006 13:02:01
ORA-01122: database file 201 failed verification check
ORA-01110: data file 201: '/home/oracle/oracle/oradata/orcl/temp01.dbf'
ORA-01565: error in identifying file '/home/oracle/oracle/oradata/orcl/temp01.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-01258: unable to delete temporary file /home/oracle/oracle/oradata/orcl/temp01.dbf
I don't see any information about creation of missing tempfile, however.

Amount of temporary tablespace size used for index rebuild

Hi All,
I want to know approximate amount of temporary tablespace size used for index rebuild. I need this information to avoid the insufficient temporary tablespace error during the huge index rebuild.
Is there a query or procedure to find it out.
Thank you.

Hi,
While creating the index, the temporary segment is created in the permanent tablespace. So permanent tablespace must have sufficient space.
http://www.oracle-base.com/articles/10g/SpaceObjectTransactionManagement10g.php
http://aprakash.wordpress.com/2010/01/05/numeric-segment-name/
Anand

Query about Temporary Tablespaces

Similar Messages

Maybe you are looking for