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 Memory Management  |  Question 35 of 114    Print  
What is use of rollback segments in Oracle database

  
Total Answers and Comments: 2 Last Update: June 28, 2006   
  
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September 02, 2005 05:32:56   #1  
Mahendra        
RE: What is use of rollback segments in Oracle database
Used to store undo data. In a transaction when data is updated , other seesions should not view the uncommited data . Other Sessions will access the undo dara in the Roll Back segment
 
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June 28, 2006 00:10:53   #2  
anandhi80 Member Since: June 2006   Contribution: 1    
RE: What is use of rollback segments in Oracle databas...

when a user updated a particular table (for example 100 rows)...the old value will be retained in the roll back segments(Oracle 8) and now it is Undo segment (oracle 9i). If the user issue a rollback command the old value will be taken from the rollback segment(that too if undo_retention parameter set properly in the parameter file).


 
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Answered by: Lachi on 2005-06-08 07:28:04For perticular transaction Alter system set rollback segment 'name'; For database, we can set in pfile. Rollback_segment='name' 
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