What is an extent?
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What is an extent?
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An extent is a logical storage unit that contains data of a corresponding segment. An extent consists of contiguous data blocks, and a segment is made up of one or more extents. Whenever a segment is created, an initial extent is assigned to it, even though the segment may be empty at the moment. When the extent corresponding to a segment is full, a new extent is automatically allocated to the segment. When a segment is dropped, the extents corresponding to the segment are again available for use by other segments.
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