The initial extent is a set of contiguous blocks in a database segment that is automatically allocated when the segment is created. Any set of contiguous blocks allocated after the initial extent is called a next extent. The total number of extents that can be allocated in a database is limited by the amount of storage space available, or in some cases, by the program used.
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The term extent is sometimes used in reference to any contiguous space (for example, a set of sectors) on a hard drive that is reserved for a particular file, folder, or application.