DAL Exception: ORA-01562: failed to extend rollback segment number 4

Hi,
in our application log, we got sometimes an error ORA-01562: failed to extend rollback segment number 4 and the application hangs and some transactions are blocked. checking the aler database file, we don't found this error but it's appearing often in our system.
would you lease advise what to do to avaoid this error, or is there a script to find oracle SQl where using too much rollback segment.
My configuration is : Oracle 10g r2 in linux SUSE.
thank you
Lucienot.

Hi,
Please refer MOS tech note *ORA-1562 and ORA-1650 Unable to Extend Rollback Segment [ID 1066542.6]*
thanks,
X A H E E R

Similar Messages

CONS-10049: Consolidator Exception: ORA-01562: failed to extend rollback

CONS-10049: Consolidator Exception: ORA-01562: failed to extend rollback segment
number 5
ORA-01650: unable to extend rollback segment R04 by 256 in tablespace RBS
How does one calculate the size of the rollback segment so as to avoid the above error?

Hi,
Please refer MOS tech note *ORA-1562 and ORA-1650 Unable to Extend Rollback Segment [ID 1066542.6]*
thanks,
X A H E E R

ORA-01562: failed to extend rollback segment

HI
I was searching the forum for an error when i came across one of the old post regarding the same issue. The link for that post is:
perfomance problem
Actually i am getting an error when i run a procedure in Oracle 8i database. Error states:
ORA-01562: failed to extend rollback segment number.....
Now in the link i mentioned above there was a reply by JES. In the reply he recommend not to use commit after every delete in the loop. Instead use one commit after the loop. This decreased the number of commits from 175000 (5 * 35000) to 1.
My questions is
1) How would it reduce the number of comments?
Can anyone explain to this point.

sorry it should be commit rather than 'comment'
Okay hoek i got the point but i m still confused. What my knowledge regarding rollback segment is that whenever we start a transaction using any DML a rollback segment starts to maintain unless we end the transaction using commit or rollback. So doing as
LOOP
DELETE.......
DELETE......
DELETE......
END LOOP
COMMIT
will keep on increasing the size of the rollback segment. In other words rollback segment will have to keep the snapshot of all the three DML's in the loop till the commit.
Instead if we do as
LOOP
DELETE.......
COMMIT
DELETE......
COMMIT
DELETE......
COMMIT
END LOOP
will keep the size of the rollback segment less than the above example because we are commiting after every DML thus releasing the space before the start of the next DML.
Don't you think the later can prevent us from ORA-01562 ?

Failed to extend Rollback Segment

Version of the database is
Oracle8i Enterprise Edition Release 8.1.7.0.0 - Production
I have a rollback tablespace that is 99%used and wen I am tryng to use DML statements to the database it is throwing the following error.
ORA-01562:FAILED TO EXTEND ROLLBACK SEGMENT 2
ORA-01650:UNABLE TO EXTEND ROLLBACK SEGMENT RBS01 BY 128 IN TABLESPACE
R
May I know how do I proceed now? Do I have to extend the tablespace or add a new datafile to the tablespace?

PK wrote:
Version of the database is
Oracle8i Enterprise Edition Release 8.1.7.0.0 - Production
I have a rollback tablespace that is 99%used and wen I am tryng to use DML statements to the database it is throwing the following error.
ORA-01562:FAILED TO EXTEND ROLLBACK SEGMENT 2
ORA-01650:UNABLE TO EXTEND ROLLBACK SEGMENT RBS01 BY 128 IN TABLESPACE
R
May I know how do I proceed now? Do I have to extend the tablespace or add a new datafile to the tablespace?
01562, 00000, "failed to extend rollback segment number %s"
// *Cause: Failure occurred when trying to extend rollback segment
// *Action: This is normally followed by another error message that caused
//        the failure. You may take the rollback segment offline to perform
//         maintainence. Use the alter rollback segment offline command
//         to take the rollback segment offline.
bcm@bcm-laptop:~$ oerr ora 1650
01650, 00000, "unable to extend rollback segment %s by %s in tablespace %s"
// *Cause: Failed to allocate an extent of the required number of blocks for
//          a rollback segment in the tablespace.
// *Action: Use ALTER TABLESPACE ADD DATAFILE statement to add one or more
//          files to the tablespace indicated.

ORA-1650: unable to extend rollback segment

Hi,
We have 20 RBS's and in our production instance we got very frequent alerts related to ORA-1650: unable to extend rollback segment continuously. When I looked for select STATUS from v$rollstat; I could see most of them are with FULL status. after couple of hours they disappeared and status became online.
How to avoid these type of alerts?
REgards

What version of Oracle?
If you are 9ir2 or later, you should be going to automatic undo management. Though it won't help your 'we cannot add space' restriction. That's not an Oracle problem, that's a corporate issue.
This problem may be caused by poor transaction design with too many processing doing too infrequent commits. That's not an Oracle problem either, that's a corporate/development issue.
So...you don't have an Oracle problem.
You can't stop the 1650s from occurring if you are unwilling to add space or address application issues. However, you can set up an email filter so that any emails containing ORA-01650 in the header or body get automatically sent to the trash.
<sarcasm>
If you can't solve a problem, then just ignore it!
</sarcasm>

Oracle error: Ora-01555 : snapshot too old: rollback segment number 1......

System Error: Unknown Database error (type qqdb_ResourceException) on WMS_WH1: Execute failed for SQL statement ............... error from database is: ORA-01555: snapshot too old: rollback segment number 1 with name "_SYSSMU1$" too small...
Any ideas ? Please help.
Thank you.

You either have
- an UNDO tablespace that is way too small (rollback segments that are too small); or
- an application that does way too many COMMITs (common with apps ported from SQL Server)
From the added info, I would guess that the Java program has a major loop and does processing on each of the values it gets in that loop. At the end of each turn in the loop, it does a commit. Then it tries to look at the next record in the master list. After a while (say around 388 loops ;-) ) it dies.
The reason is that when it looks for information in the master query, it needs to rebuild that information to the moment that query was initiated. It uses rollback (AKA undo) to rebuild that. But rollback is not guaranteed to exist after a commit (unless forced) and once a commit happens, that area can be reused. When it is reused, the information is no longer there to rebuild the row, and that raises an ORA-01555
Edited by: Hans Forbrich on Sep 11, 2009 3:44 PM

ORA-01555: snapshot too old: rollback segment number 3 with name "_SYSSMU3$

A Materalized view is scheduled to update every 12 hours . When it has tried to update it has thrown the error ...
ORA-12008: error in materialized view refresh path
ORA-01555: snapshot too old: rollback segment number 3 with name "_SYSSMU3$"
too small
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 803
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 860
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 841
ORA-06512: at line 1

Hi,
Can you increase the size of the UNDO Tablespace ?
For more information, you can find on this link below:
http://forums.oracle.com/forums/search.jspa?threadID=&q=ORA-01555&objID=c84&dateRange=all&userID=&numResults=15
Cheers

ORA-01555: snapshot too old: rollback segment number 8 with name

Hi,
Database version is Oracle8i Enterprise Edition Release 8.1.7.4.0
I am struggling to fix this error, since I have not worked on 8I DATABASE.
We getting this kind of error very frequently in one of the 8i database.
ORA-01555: snapshot too old: rollback segment number 8 with name "ROLLBACK08" too small
How do i fix this permantely.
I have verified the RBS configured in the db.
SEGMENT_NAME TABLESPACE_NAME OWNER STATUS
SYSTEM SYSTEM SYS ONLINE
ROLLBACK0 SYSTEM SYS OFFLINE
ROLLBACK02 RBS1 SYS ONLINE
ROLLBACK03 RBS1 SYS ONLINE
ROLLBACK04 RBS1 SYS ONLINE
ROLLBACK05 RBS1 SYS ONLINE
ROLLBACK06 RBS1 SYS ONLINE
ROLLBACK07 RBS1 SYS ONLINE
ROLLBACK08 RBS1 SYS ONLINE
ROLLBACK09 RBS1 SYS ONLINE
ROLLBACK10 RBS1 SYS ONLINE
ROLLBACK01 RBS1 SYS ONLINE
SQL> SELECT t1.name, t2.extents, t2.rssize, t2.optsize, t2.hwmsize, t2.xacts, t2.status FROM v$rollname t1, v$rollstat t2 WHERE t2.usn = t1.usn ;
NAME EXTENTS RSSIZE OPTSIZE HWMSIZE XACTS STATUS
SYSTEM 7 770048 770048 0 ONLINE
ROLLBACK02 2 41934848 262144000 41934848 0 ONLINE
ROLLBACK03 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK04 3 62906368 262144000 62906368 0 ONLINE
ROLLBACK05 2 41934848 262144000 41934848 0 ONLINE
ROLLBACK06 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK07 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK08 3 62906368 300146688 62906368 0 ONLINE
ROLLBACK09 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK10 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK01 3 62906368 300146688 62906368 0 ONLINE
NAME0     USER0          RSSIZE Wraps Extents Shrinks     OPTSIZE     COMM0
ROLLBACK01          62906368     19     3     0 300146688 lookup
ROLLBACK02          41934848     0     2     0 262144000 lookup
ROLLBACK03 OPS$RTRADM     62906368     20     3     0 262144000 lookup 50
ROLLBACK04          62906368     34     3     0 262144000 lookup
ROLLBACK05 OPS$RTRADM     41934848     28     2     0 262144000 No Command
ROLLBACK06 OPS$RTRADM     62906368     21     3     0 262144000 lookup 50
ROLLBACK07 OPS$RTRADM     62906368     25     3     0 262144000 lookup 50
ROLLBACK08          62906368     32     3     0 300146688 lookup
ROLLBACK09 OPS$RTRADM     62906368     20     3     0 262144000 Select
ROLLBACK10 OPS$RTRADM     62906368     24     3     0 262144000 lookup 50
SYSTEM               770048     0     7     0     lookup
Can someone help ... who to set the RBS size here... i dont want this error happens here.. what i need to look or check.

lm**** wrote:
Hi,
Database version is Oracle8i Enterprise Edition Release 8.1.7.4.0
I am struggling to fix this error, since I have not worked on 8I DATABASE.
We getting this kind of error very frequently in one of the 8i database.
ORA-01555: snapshot too old: rollback segment number 8 with name "ROLLBACK08" too small
How do i fix this permantely. upgrade to supported Oracle version since V8.1.7 has not been supported this Century.

ORA-01555: snapshot too old: rollback segment number

I getting error while i am taking export one of the table.
EXP-00056: ORACLE error 1555 encountered
ORA-01555: snapshot too old: rollback segment number with name "" too small
ORA-22924: snapshot too old
Export terminated successfully with warnings.
can someone advise me

1) What version of Oracle?
2) Is UNDO_MANAGEMENT set to AUTO? Or are you still using manual undo management?
3) What is your UNDO_RETENTION? How quickly are you generating UNDO? How big is your UNDO tablespace?
4) How long does the export run?
5) Did you specify CONSISTENT=Y in the export? If so, is that necessary?
6) What else is going on? Is it possible to run the export during a quieter period?
Justin

Request got errror as ORA-01555: snapshot too old: rollback segment number

hi Consultants,
reqeust gor errores as ORA-01555: snapshot too old: rollback segment number 50 with name "_SYSSMU50$" too small ORA-06512: at line 90
anyone please advice me on this.
Thanks,
Anu.

Thanks for ur reply
Is this a standard or custom concurrent program?This is customer program it is working fine if run as individual
Thanks,
Anu

ORA-01555: snapshot too old: rollback segment number 3 with name "RB02

It just happen while processing ....

01555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small"
// *Cause: rollback records needed by a reader for consistent read are
// overwritten by other writers
// *Action: If in Automatic Undo Management mode, increase undo_retention
// setting. Otherwise, use larger rollback segments

ORA-01555: snapshot too old: rollback segment number 6 with name "R05" too

Can someone please help me how to overcome this dreaded ORA-01555 and how to know what exactly is causing this. There can be number of reasons this can occur :
1. Fewer and smaller rollback segments for a very actively changing database
2. Corrupted rollback segment
3. Fetch across commit
4. Fetch across commits with delayed block clean out
Thanks

http://asktom.oracle.com/pls/ask/f?p=4950:8:802460143396322798::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:275215756923
<quote source="asktom">
the only CAUSE of a 1555 is improperly sized rollback segments.
</quote>
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:275215756923#10100046218454
Message was edited by:
Kamal Kishore

Ora-01555, snapshot too old: rollback segment number 2 with name "_SYSSMU1

Hi,
Oracle 10g,
Im getting this error during execution of a query
Autoextend is ON for the undo datafile
There is 6 GB free space in the undo tablespace
Earlier the value for undo_retention was 18000.
I reset it using alter system set command to 25000.
But it still gives the same error
Please suggest on what could be the issue

Hi,
I got the same error twice since 2 weeks.
The DB size is 1.4TB and the TBS are as follows:
SQL> SELECT tablespace_name, retention FROM dba_tablespaces;
TABLESPACE_NAME RETENTION
SYSTEM NOT APPLY
SYSAUX NOT APPLY
PSAPUNDO NOGUARANTEE
PSAPTEMP NOT APPLY
PSAPSR3 NOT APPLY
PSAPSR3702 NOT APPLY
PSAPSR3USR NOT APPLY
7 rows selected.
the PSAUNDO tbs is 12GB.
SQL> select max(maxqueryLEN) FROM V$UNDOSTAT;
MAX(MAXQUERYLEN)
40672
SQL> show parameter undo;
NAME TYPE VALUE
inmemory_undo boolean FALSE
undo_management string AUTO
undo_retention integer 900
undo_tablespace string PSAPUNDO
Is undo_retention used only for flashback or it will improve Query, update and delete statements?
What will be the appropriate size for undo_retention?
Note that currently we are doing archiving and it is taking much of the resources in terms of rollback segments.
Please advise
Thanks,
Gavisht

ORA-01555: snapshot too old: rollback segment number with name "" too smal

Hi,
I'm working on Oracle Database 11g Release 11.1.0.6.0 - 64bit Production With the Real Application Clusters option.
I'm exepriencing the error in the subject executing a procedure.
This procedure run at 2am, reading from a table all records written the day before:
... WHERE date_write between d1 and d1+1 ....
d1 = trunc(sysdate-1)So I suppose that the recordset cannot be changed during the execution of the procedure.
The recordset extracs more or less 10milions of records.
The procedure than read few records from another table and then insert a new record into a table (trying to delete it if already existing).
I commit every 10k records.
What I noticed is that the procedure always fails after 1 hour, that's the undo_retention value.
I tried to change the param to 2 hours, and last run failed after 2 hours...
I think I understood the ORA-01555 causes, but I thought the commit would have avoid it.
So, any suggestion?
Thanks in advance!
Samuel

What's then the logic why the commit is causing it?When you commit a transaction, involved undo blocks are "released", and they might be overwritten : if those blocks are needed for consistency, then you get ORA-01555 error.

How to extend rollback segment

Hi,
for a few days I've been getting the following messages:
ORA-01562: failed to extend rollback segment number 3
ORA-01650: unable to extend rollback segment RBS2 by 512 in tablespace RBS
after running a package which has always had no problems and where it's also been added a COMMIT after the insert statements inside the package.
DBAs have tried to increase the rollback segment but the problem is always the same.
Have you got some advice?
Thanks!

By adding a datafile in RBS tablespace.

DAL Exception: ORA-01562: failed to extend rollback segment number 4

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