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.

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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

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 ?

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.

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-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>

Failure to extend rollback segment 6

Hello All,
We have 4 Node RAC 9.2.0.8 on IBM AIX.
I am getting following messages in the Alert.log file.
Failure to extend rollback segment 6
FULL status of rollback segment 6 set.
Failure to extend rollback segment 6
Failure to extend rollback segment 6
Failure to extend rollback segment 6
Failure to extend rollback segment 6
Failure to extend rollback segment 6
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Failure to extend rollback segment 6
FULL status of rollback segment 6 cleared.How to interpret this log messages?
Regards.

It is clear message, your undo rollback segment is small, You need to extent the tablespace, with "alter tablespace add ...". In the other way It can be a inefficient query that "eat" all the rollback.
HTH
Antonio NAVARRO
PS; 9.2.0.8 is terminal release for Oracle 9i and It is out of support.

Unable to extend rollback segment 0

I'm migrating a 7.3.4 database to 8.0.5 using MIG80 and i get messages:
ora-01562 Unable to extend rollback segment 0
ora-01528 max # extents <121> reached for rollback segment system
My tablespace system's original size is 120M, now I have it grown to 400M, also have my rbs tablespace grown to 200M, I'm using MULTIPLIER=30, i've migrated 2 databases same sized but this time does'n work.
Can you help me?
I4m kind of hurry, i have to migrate 7 databases by august 25.
Thanks

Dear friend
Create rollback segment with large
in size.
sql> set transaction use rollback segment 'Name of the roll'
suresh
null

Failure to extend rollback segment

Hi
The following Info's are there in the alertlog but there is no ORA errors, Im having enough space in rollback segment,still im getting the same error daily, can anyone please assist?
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Thanks
Venkat

There must be some accompanying messages after this error. What are the other errors you get?

Unable to Extend Rollback Segment

Hi,
This was the error when I tried to create a table with large amount of data using
Create Table As Select * From TableName
Can I handle this error From Pl-Sql
Since the table is created dynamically
through Pl-Sql.
Can I avoid this error by setting following
parameters in the file init.ora.
Transactions
TransactionsPerRollbackSegment
Regards
Mrinal
null

Dear friend
Create rollback segment with large
in size.
sql> set transaction use rollback segment 'Name of the roll'
suresh
null

How to solve about rollback segment fail to extend?

I've a transaction about 50,000 records, then process fail in script. the error code is ORA-01562 FAIL TO EXTEND ROLLBACK SEGMENT = num. I'm use oracle database 7.3.4., form 4.5

It would be better to have several small transactions instead of one huge transaction of 50000 records, like you say. You may use an additional log table to keep the log of how far you've got in processing those 50000 records, and pick up from where you've left in case something goes wrong.
Anyway, one thing that may help would be to use:
alter tablespace your_rbs_tablespace
add datafile ...;
to have more space for your rollback segment(s).
Eventually, you may have a large rollback segment and set transaction use huge_rbs, in order to have your huge transaction use that huge rollback segment.
null

Rollback segment problem

Hello:
I'm using oracle 8 database and I have a process that generates small transactions (and they're really small), usually this process is executed from 2 or 3 different workstations at the same time, but they don't use the same data sets. The frequency of execution of the small transaction is 10 or 12 a second for each workstation. Each time the process is executed I can count near 6000 transactions, and I always have 2 o 3 of them arising "ORA-01562: failed to extend rollback segment number n" error. Since the transaction uses a small space of the rollback segment I can't find an explanation to this behavior. Is this related to the time between transaction and the freeing of the unused rollback segment ? I would really appreciate if somebody could help me!!!
Thanks in advance, Javier Petrozzi

It appears to me that some of the transactions remain open for quite some time and the new transactions are not able to obtain an extent for the rollback segment.
The following query gives some useful information.
1 select s.sid, s.username, r.name "SEGMENT NAME"
2 from v$session s, v$transaction t, v$rollname r
3 where s.taddr=t.addr
4* and t.xidusn = r.usn
SQL> /
SID USERNAME SEGMENT NAME
16 SCOTT _SYSSMU7$You may have to commit your changes sooner.

Rollback segment problem during import

Hello experts,
please help.
I have the following error when importing table data to my
Oracle 8.1.7 database.
IMP-00058: ORACLE error 1562 encountered
ORA-01562: failed to extend rollback segment number 16
ORA-01237: cannot extend datafile 3
kind regards
Yogeeraj

alter the tablespace which contains rollback segments, and
either change the existing datafile (datafile 3) to autoextend
on or resize, or add new datafile in another disk drive which
has more space (it is better to set autoextend on or give it a
larger space).
Hello experts,
please help.
I have the following error when importing table data to my
Oracle 8.1.7 database.
IMP-00058: ORACLE error 1562 encountered
ORA-01562: failed to extend rollback segment number 16
ORA-01237: cannot extend datafile 3
kind regards
Yogeeraj

Rollback segment error

Hello experts,
My problem is as follows:
I need to perform a large transaction on one of my tables in my
database. I have to delete a large number of records using a
command as follows:
Delete from mytable where ordernumber like '2000%';
Each time i launch this command i have the following error:
ERROR at line 1:
ORA-01562: failed to extend rollback segment (id = 3)
ORA-01628: max # extents (30) reached for rollback segment R03
I know that i have a problem with my rollback segment. I have
thus created a large rollback segment so that my transaction can
use it.
I don't know how to tell my transaction use the large rollback
segment that i created.
(i know there is a command called set transation user rollback
segment large_rs1, i have tried it on sqlplus. it gives me
error: ORA-01453: SET TRANSACTION must be first statement of
transaction)
Please help
thanks in advance for a reply
Kind regards
Yogeeraj

First, you have to create a bigger rollback segment (i.e. RBBIG).
Then, before each query, you must type:
set transaction use rollback segment rbbig;
This will force the use of the specified rollback segment.
Hope this helps.

Big problem with ROLLBACK SEGMENT

I tried insert into DB Oracle 8i more than 23000 rows from .sql files.
This files contents:
-- START
delete from grls;
insert ..........
insert ..........
insert ..........
-- END
ORA-01562: failed to extend rollback segment ...
My configuration:
CREATE TABLESPACE rbs datafile '$ORACLE_BASE/oradata1/$ORACLE_SID/rbs01.dbf' SIZE 10M;
CREATE TABLESPACE rbs_02 datafile '$ORACLE_BASE/oradata1/$ORACLE_SID/rbs01_02.dbf' SIZE 300M;
CREATE ROLLBACK SEGMENT rbs01 storage (initial 20k next 20k minextents 3 maxextents 121) TABLESPACE rbs;
CREATE ROLLBACK SEGMENT rbs16 storage (initial 20k next 20k minextents 3 maxextents 121) TABLESPACE rbs;
CREATE ROLLBACK SEGMENT rbs_load01 storage (initial 30m next 30m minextents 3 maxextents 10) TABLESPACE rbs_02;
Please help me.

1.)Did you place the rollback segments online
after creation?
Alter rollback segment RBS01 online;
Alter rollback segment RBS16 online;
Alter rollback segment RBS_LOAD01 online;
2.)Did you set your init[sid].ora parameter
ROLLBACK_SEGMENTS = (RBS01, RBS16, RBS_LOAD01) so that they will automatically come on line on istance startup?
3.) You have set up only 304Meg of space for them cumulatively. Is this enough for the 23thousand rows you want to insert?
If not you may want to enable the autoextend option on your datafiles. Of course you will want to change your maxextents. Leaving that value out will give you a default of 505 maxextents.
4.) And finally you could throw in a commit during the insert procedure. This will commit the transaction at that point and clear out the rollback segments for use again.
Tom

Failed to extend Rollback Segment

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