Growing UNDO datafile with small transactions?

Hi,
We're currently using 9i release 2 (with patchset) and have noticed that the UNDO datafile is increasing in size when it was my understanding that it shouldn't. We are performing a lot of DML (millions of inserts/updates) but commiting after each operation i.e. the transcations are very small but the number is very large. Why is the undo datafile getting very big in thos scenario and is there anything I can do to prevent it happening?
Many thanks,
Warren
[email protected]

After reading again ur post, i think my first answer is not adapted to ur question :-)
The Undo segment is a circular one so it will grow till he reached the last extent and after only re-write in the first one (if the undo-entries in the first extent are commited).
So the undo tablespace is too "big" in ur case cause u should have created it permitting it to grow big...
Fred

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Undo tablespace with active transaction/segment corrupted

How to recover if undo tablespace with active transaction/segment corrupted

Try RMAN blockrecover or restore the tablespace from latest backup and recover it.

Undo datafile grows fast

Hi, all
The undo datafile in my database growed fast yesterday. I want to find out which DML SQLs caused the datafile growing, is it possible?
Thanks,
Siko.Lee

Rafi (Oracle DBA) wrote:
Hi,
Do you want the result like this:
SQL> sho user
USER is "SYS"
SQL> select
2 to_char(begin_time,'yyyy-mm-dd hh24:mi:ss')
3 starttime,
4 to_char(end_time,'yyyy-mm-dd hh24:mi:ss')
5 endtime,
6 undoblks,
7 maxquerylen maxqrylen
8 from v$undostat;
STARTTIME           ENDTIME               UNDOBLKS MAXQRYLEN
2011-02-22 16:54:00 2011-02-22 16:58:13          0          0
2011-02-22 16:44:00 2011-02-22 16:54:00         12          0
2011-02-22 16:34:00 2011-02-22 16:44:00         42          0
2011-02-22 16:24:00 2011-02-22 16:34:00          8          0Best regards,
Rafi.
http://rafioracledba.blogspot.com
Thanks, Rafi
But I want to know which DML SQL generated the maximum undo data in the past.

B2B Inbound File with Multiple Transactions failing

Hi ,
Problem Summary: When the inbound file is coming with multiple transactions (combination of 997 and non-997) ,
If the 997 is the FIRST transaction in file, B2B is processing only 997 and remaning transactions are getting rejected.
Where as if the 997 is the LAST transaction in file, then all the transactions are processing correclty.
SOA Version: SOA 11G (11.1.1.5).
Example 1: below sample we got two transactions, 997 and 214. here 997 is the FIRST transaction in the file.
in this case B2B is processing 997 correctly, and 214 is errored with below error message
"B2B-51507 - A data segment with 'Mandatory' status is missing. A data segment with 'Mandatory' status is missing. An X12 syntax error occurred. An X12 syntax error occurred. An X12 syntax error occurred. A data segment with 'Mandatory' status is missing. A data segment with 'Mandatory' status is missing.
ISA00* *00* *02*xxxx *01*1234555 *120516*1018*U*00401*000005822*0*P*:~*
GSFA*xxxx*1234555*20120516*1018*5822*X*004010~*
ST997*58220001~*
AK1SM*7159~*
AK9A*1*1*1~*
SE000004*58220001~*
GE1*5822~*
IEA1*000005822~*
ISA*00* *00* *02*xxxx *01*1234555 *120516*1018*U*00401*000005823*0*P*:~
GS*QM*xxxx*1234555*20120516*1018*5823*X*004010~
ST*214*58230001~
B10*2313813*M1213131*xxxx~
N1*SF*xxxxxx*ZZ*124~
N4*xxxxxx*AR~
LX*1~
AT7*AF*NS***20120516*1017*LT~
MS1*xxxxx*AR~
L11*01*QN~
AT8*G*L~
SE*10*58230001~
GE*1*5823~
IEA*1*000005823~
Example 2 : below sample we got two transactions, 997 and 214. here 997 is the LAST transaction in the file.
in this case B2B is processing ALL TRANSACTIONS correctly
ISA*00* *00* *02*xxxx *01*1234555 *120516*1018*U*00401*000005823*0*P*:~
GS*QM*xxxx*1234555*20120516*1018*5823*X*004010~
ST*214*58230001~
B10*2313813*M1213131*xxxx~
N1*SF*xxxxxx*ZZ*124~
N4*xxxxxx*AR~
LX*1~
AT7*AF*NS***20120516*1017*LT~
MS1*xxxxx*AR~
L11*01*QN~
AT8*G*L~
SE*10*58230001~
GE*1*5823~
IEA*1*000005823~
ISA00* *00* *02*xxxx *01*1234555 *120516*1018*U*00401*000005822*0*P*:~*
GSFA*xxxx*1234555*20120516*1018*5822*X*004010~*
ST997*58220001~*
AK1SM*7159~*
AK9A*1*1*1~*
SE000004*58220001~*
GE1*5822~*
IEA1*000005822~*
Thanks,
Naveen

Hi,
My name is Phil DeLaine and I work for one of Oracle's Gold Partners, TechDemocracy.
I saw your post about the B2B transaction errors you are experiencing. We have great experience with B2B and have solved very complex problems. (References available.)
Would you like to use one of our B2B expert technical resources to solve this problem and deliver your project error free and fully functional?
Please let me know if you would like to discuss what we can do for you. You can reach me anytime.
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Phil DeLaine
Sales Director - Northeast
TechDemocracy
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Cannot drop undo tablespace with Active extents but no active sessions

Hi all,
I am running on 10gr2 oracle database in a Linux 32 bit environment.
I have a corrupted undo datafile. I've been able to recover the datafile but still the alert logs is still showing that it is corrupted.
Now what I'm trying to do is to drop the old undo tablespace like the one discussed here Change undo tablespace in Oracle - Switch Oracle's Undo tablespace.
My problem is I have an Active extent but no active session corresponding to it:
SYS@ccasdb AS SYSDBA > SELECT a.name,b.status
FROM   v$rollname a,v$rollstat b
WHERE a.usn = b.usn
AND    a.name IN (
                  SELECT segment_name
                  FROM dba_segments
                  WHERE tablespace_name = 'UNDOTBS1'
                 ); 2    3    4    5    6    7    8
NAME                           STATUS
_SYSSMU18$                     PENDING OFFLINE
SYS@ccasdb AS SYSDBA > SELECT a.name,b.status , d.username , d.sid , d.serial#
2 FROM   v$rollname a,v$rollstat b, v$transaction c , v$session d
3 WHERE a.usn = b.usn
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5 AND    c.ses_addr = d.saddr
6 AND    a.name IN (
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no rows selected
but still cannot drop the undotablespace.
SYS@ccasdb AS SYSDBA > drop tablespace UNDOTBS1 including contents and datafiles;
drop tablespace UNDOTBS1 including contents and datafiles
ERROR at line 1:
ORA-30013: undo tablespace 'UNDOTBS1' is currently in use
Regards,
Tim

Yes i was able to recover the datafile but the alert_log kept on prompting that it is still corrupted. The datafile's status is online.
I want to kill the session/s contributing to the PENDING OFFLINE status of the rollback segment so I can already drop the undotablespace and so
that the alert log will stop prompting for that corrupted datafile in that UNDOTABLESPACE.
Can i Just alter the tablespace's datafiles to offline drop then just drop it. Then I drop the tablespace?

Block corruption in UNDO datafile

Hi,
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Alert log says:
Tue Jun 24 17:59:38 2008
Errors in file /oracle/admin/CBOPROD/bdump/cboprod_pmon_2596886.trc:
ORA-01578: ORACLE data block corrupted (file # 2, block # 121)
ORA-01110: data file 2: '/oracle/oradata/CBOPROD/undotbs01.dbf'
Tue Jun 24 17:59:38 2008
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Tue Jun 24 17:59:38 2008
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Tue Jun 24 17:59:38 2008
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Tue Jun 24 17:59:38 2008This issue happend while loading the data into db. I am more worried about data rather than availability as we took a good time move production data.
I have the cold backup of last night using RMAN (at mount stage) and my db is running in Archive log mode.
Please suggest to how to approach in current scnario.
OS: AIX 5.3
Oracle: 10.2.0.3.0
Thanks for your time
Bhupinder

Bhupinder,
The problem here it is your undo tablespace, and you are getting this error, because Oracle is hitting these blocks to use them.
You could try to create a new undo tablespace, but this measure is a bit strange, as obviously you can change the undo tablespace only without current transactions. If you can change the undo tablespace why recover the inactive undo tablespace?
I would probably try to change the undo tablespace, and if that fails there really is no other solution than at least restore the entire undo tablespace. Likely undo is disabled in mount stage so this should work.
Hth
Sybrand Bakker
Senior Oracle DBA

Please assist I have lost undo datafile

Hi ,please advice me ,the filesystem that contantain undo datafile is lost while the database is was down for OS maintenance,now when I have to start database I found that undo datafile is lost and they can't even see it from OS side,how can I start the database.

P. Forstmann wrote:
If you didn't shutdown your database cleanly and you have no backup for undo tablespace then there is no documented way to restart your database instance and you should contact Oracle Support.Yes,that is right,if database was not cleanly shutdown(with abort option) then actually in next instance startup will need recover and its instance recovery(must be perform).But performing instance recovery need undo tablespace,actually this is lost ,so with simple operations you can not open database.Of course the best way is report Oracle Support.However you can implement hidden parameter to opening database(_offline_rollback_segments).I do not recommend this way,just can try this.Before doing this you have to full backup database.

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Hi -
I am building an XLR report that does a comparison of net sales data across two periods for a given sales employee's BPs.
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Removing FACT on BPA in this case ends up returning all the BPs and not respecting the SLP(SlpName = "aName") part of the query.
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Message no. FAA_POST047
Diagnosis
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Hi Anton
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Growing UNDO datafile with small transactions?

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