Difference between roll back and undo segment.

Hi ,
Oracle 10.2.0.1.0
whats the difference between roll back and undo segemnt ? are they one and same as per changing version of oracle ? please help

Hi,
Both will do the same functionality,but in oracle 9i they made it simplify ,because if u are using rollback segments ,u need to put them online in init.ora and u need to take care space management etc.
so in oracle 9i they introduced undo tablespaces on that u can creage undo segments and space management will be take care by oracle managed files ,so its reduces the burden of dba
Regards,
Simma....

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