The UNDO tablespace must be Locally Managed and the extent allocation must be SYSTEM. If you will try to create as dictionary managed or UNIFORM extent size an error will be returned.
HTH
Sanjay G.
Oracle Certified Professional 8i, 9i.
"The degree of normality in a database is inversely proportional to that of its DBA"
We have a highly OLTP environment, do u think using Rollbacks this way can cause performance degradation. I am actually having performance degradation on my database. although the Waits shown in the STATSPACK report show Data Block contention, do u think the Rollbacks could have a role to play in this.