Dump roll back segment too small

Hii All,
From last week i am getting this dump in my production system.
Database error text........: "ORA-01555: snapshot too old: rollback segment
number 20 with name "PRS_18" too small#"
Internal call code.........: "[RSQL/FTCH/MKPF ]"
What should i do to avoid this dump.
Regards,
Viren.

HI Rana,
When you have "ora-01555: snapshot too old (rollback segment _ too small)", it usually means failure due to the lack of rollback space. The failure indicates read consistency error, as your active transaction overwrites existing, uncommitted transaction, which implies that the system change number SCN in the block is newer than the SCN at the start of the transaction. The read consistency image of new data can therefore not be created. This can happen when large transactions are being written where there is not enough tablespace for the rollback segments to expand or when the rbs has reached its "MAXEXTENTS".
Solution is to either add new roll back segment or extend the size of the existing ones.To extend the size of existing ones, increase both the values of their MINEXTENTS and OPTIMAL parameters with ALTER ROLLBACK SEGMENT statement or create additional ones.
Thanks
Prince Jose

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brain_heart wrote:
Hi,
I have oracle 9.1 version and have created 5g undo tablespace apart from 20m rbs tablespace for 15 rollback segments. But it is seen that whenever i give UNDO_MANAGEMENT=AUTO then rollback segments are created using undo tablespace and not allowing rollback segment in rbs tablespace ONLINE. In the reverse happens whenever I give UNDO_MANAGEMENT=MANUAL , the rollback segments in the rbs tablespace gets focus and roll back segments in the Undo tablespace goes offline. Is there anything that I can do so that both undo tablespace and redo segments in the rbs tablespace gets working together so as to minimize the undo contention.No that's the way it would work, you can either use the automatic undo or the manual one.not both. And its better to stick with the automatic one IMHO. Have a read of this link to understand more about undo.
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Hi All,
I am getting this short dump for few loads.The error is :
"(FUNCTION)", or declared in the procedure's RAISING clause.
To prevent the exception, note the following:
Database error text........: "ORA-01555: snapshot too old: rollback segment
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http://www.dba-oracle.com/t_ora_01555_snapshot_old.htm
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Message was edited by:
        Pizzaman

ORA-01555 Snapshot too old, rollback segment too small after flashback tab

Hello
Further to an update on a table in database, I realize that I have done an error and I want to come back in the state of table before this operation.
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Regards
Edited by: 794982 on 12 nov. 2010 05:05
Edited by: 794982 on 12 nov. 2010 05:05
Edited by: 794982 on 12 nov. 2010 05:06

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http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/undo.htm

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Hello everyone:
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see this
http://listserv.sap.com/pipermail/linux.general/2001-July/thread.html#670
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in this solution, it says to use 'field groups'
http://www.sapfans.com/sapfans/forum/r2all/messages/42.html
Try these links as well - others with the same problem
http://marc.info/?l=mysap-linux-general&w=4&r=1&s=%22rollareatoo+small%22&q=b
Message was edited by:
        Kris Donald

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Dump roll back segment too small

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