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Oracle10g Grid Computing with RAC
Chapter 8 - RAC Administration

 UNDO Tablespace Features

create table salesman
name varchar2(4), salesid number(6) )
tablespace undo_rbs1 ;

  • You will get the message ORA-30022: Cannot create segments in undo tablespace
     

  • Only one UNDO tablespace can be used at the instance level.
     

  • UNDO segments are created automatically and are owned by PUBLIC. They are named as _syssmun$ and are not manually manageable. The number of segments depends on the sessions parameter.
     

  • When you choose AUM, you will not be able to manage an undo or rollback.

For example, if you issue this statement:

create public rollback segment rsg1 tablespace rbs1 ;

You will see the error:

ORA-30019: Illegal rollback segment operation in automatic mode

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
 ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma

 

   
  
 

 
 
 
 
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