Extent

extent - [data analysis] The minimum bounding rectangle (xmin, ymin and xmax, ymax) defined by coordinate pairs of a data source. All coordinates for the data source fall within this boundary.

[Category=Geospatial ]

Source: esri, 17 April 2012 09:33:48, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation  

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extent - 1) An extent is a set of contiguous blocks allocated in a database. In the Oracle database program, the first set of contiguous blocks, set up automatically when a segment is created, is called the initial extent. After the initial extent has been filled, the program allocates more extents automatically. These are known as next extents. 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.

2) 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.

Related glossary terms: record, flexfield, splay tree, in-memory database, virtual private database (VPD), Edgar F. "Ted" Codd, field, object-oriented database management system (OODBMS / ODBMS), hash / hashing / hash algorithm, Very Large Database (VLDB)

[Category=Data Management ]

Source: WhatIs.com, 03 August 2013 09:15:38, http://whatis.techtarget.com/glossary/Data-and-Data-Management