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 Memory Management  |  Question 4 of 113    Print  
What is a data segment

  
Total Answers and Comments: 1 Last Update: September 01, 2005   
  
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September 01, 2005 10:52:08   #1  
Praim Sankar        
RE: What is a data segment
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 data is stored in its own data segment, while each index's data is stored in its own index segment. ORACLE allocates space for segments in extents. Therefore, when the existing extents of a segment are full, ORACLE allocates another extent for that segment. Because extents are allocated as needed, the extents of a segment may or may not be contiguous on disk, and may or may not span files. An extent cannot span files, though.
 
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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 : 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 : Yes. Using raw files/devices for database can have a slight performance gain. Raw files are unformatted disk partitions that can be used as one large file. Raw devices have the benefit of no file system overhead, because they are unformatted partitions. ...
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) ...
 The data dictionary cache is stored in an area in SGA called the Shared SQL Pool.  This will allow sharing of parsed SQL statements among concurrent users. 
 Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored. 
 Database buffers are cache in the SGA used to hold the data blocks that are read  from  the  data  segments in the database such as tables, indexes and clusters DB_BLOCK_BUFFERS 

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