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 Memory Management  |  Question 75 of 114    Print  
What is a Rollback segment entry ?
 
It  is  the  set  of  before  image  data blocks that contain rows that are modified by a transaction.
Each   Rollback  Segment  entry  must  be  completed  within   one rollback segment.
 
A single rollback segment can have multiple rollback segment entries.



  
Total Answers and Comments: 1 Last Update: December 29, 2005   
  
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December 29, 2005 04:07:32   #1  
samiksc Member Since: October 2005   Contribution: 233    

RE: What is a Rollback segment entry ?

A rollback segment entry consists of image of pre-update value, block address, data file number, transaction ID and transaction status (active or committed).

A single rollback segment may contain several rollback entries and several active transactions.


 
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 Related Questions

Latest Answer : Segments  The level of logical database storage above an extent is called a segment. A segment is a set of extents which have been allocated for a specific type of data structure, and all are stored in the same tablespace. For example, each table's ...

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' 
Latest Answer : In above answer one correction is there,  For perticular transaction we can use fallowing syntax.  >set transaction use rollback segment 'name' ...

Latest Answer : create rollback segment roll1tablespace roll1; ...

Latest Answer : by correctly fixing optimal size ...

Latest Answer : by using dictionaray view's called v$rollstat,dba_rollback_segs. ...

List the sequence of events when a large transaction that exceeds beyond its optimal value when an entry wraps and causes the rollback segment to expand into another extend.

Latest Answer : 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 ...

Latest Answer : when ever changes happend to the database previous change will be there in the rollback segment. ...

Latest Answer : Segment is droppedOn shrinkOn truncation (TRUNCATE used with drop option) ...

 Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored. 


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