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what is Physical Storage of the Data in Oracle?

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what is Physical Storage of the Data in Oracle?
posted Oct 14, 2014 by Archana

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1 Answer

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The finest level of granularity of the database are the data blocks.

 Data Block:  One Data Block correspond to specific number of physical database space
 Extent:  Extent is the number of specific number of contigious data blocks.
 Segments:  Set of Extents allocated for Extents. There are three types of  Segments
                    a) Data Segment:  Non Clustered Table has data segment data of every table is stored in cluster data segment
                    b) Index Segment:  Each Index has index segment that stores data
                    c) Roll Back Segment:  Temporarily store 'undo' information
answer Oct 15, 2014 by Arun Gowda
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