What is the meaning of Primary Extents, Secondary Extents and MAXEXTENTS?
An extent is a set of n disk pages (n = value of extent). An enscribe file is created with extents. A disk page represents 2K of data (= 2048 bytes). Extents are allocated in consistent data blocks on the physical disk drive. Primary extent: The disk space ‘booked’ when the first data is written to the file. The size is defined by the value of Primary Extent Size. Secondary extent: Whenever the first/previous extent is filled up, new disk space is ‘booked’. The size is defined by the value of Secondary Extent Size. MAXEXTENTS: The maximum value of extents to allocate for a file (1 primary + 1 or more secondary extents). The Primary extent is the amount of physical disk space allocated for a file when the first piece of data is written to it. When that space is filled, a Secondary extent is allocated based on the size given in the file description. The maximum number of extents for a file is determined by the value of MAXEXTENTS, and is the total number that will be allocated to a file
