Set of logical blocks having addressing numbers that form a continuous ascending sequence.
Second level of logical database storage. An extent is a specific number of contiguous data blocks allocated for storing a specific type of information. See Also: data block, segment
Contiguous area of disk space allocated to a file. A file might have zero or more extents.
A set of consecutively addressable disk blocks. An extent may be virtual or physical. Virtual extents are consecutively addressable disk blocks on a Network-Volume, while physical extents are consecutively addressable blocks on an array volume.
The interval of time during which references to an object occur. Objects with dynamic extent may be referenced at any time between establishment (for example, allocation) and disestablishment (for example, freeing) of the object. Objects with static extent may be referenced at any time during program execution. Objects with local extent may be referenced only in the lexical scope of their declaration.
A group of contiguous file system data blocks treated as a single unit. An extent is defined by the address of the starting block and a length.
a block of physically contiguous pages on disk used to store database objects
a contiguous area of disk space that AdvFS allocates to a file
a contiguous group of blocks
a contiguous range of disk blocks allocated to a single file and managed as a unit
a contiguous set of data blocks (defined next) within a segment
a contiguous set of two or more data blocks
a group of contiguous blocks that are allocated to an Oracle database object such as a table or index
a logical grouping of at least four physically contiguous pages
a LOGICALLY contigous set of blocks -- this is true
a logically contiguous set of blocks on disk
a logical view of all persistent instances of a given persistence-capable class, possibly including subclasses
a physical concept -- it is a unit of allocation
a run of contiguous clusters
a sequence of contiguous aggregate blocks allocated to a JFS (Journaled File System) object as a unit
a sequence of contiguous in block number order unfleaves that belong to the same object
a single descriptor for a range of contiguous blocks, instead of using, say, hundreds of entries to describe each block individually
a specific number of contiguous data blocks, obtained in a single allocation, and used to store a specific type of information
a specific number of contiguous data blocks within the same tablespace
a storage unit composed of contiguous blocks
a unit of disk space allocation
16K consecutive bytes in a file. Extents are numbered from 0 to 31. One extent can contain 1, 2, 4, 8, or 16 blocks. EX is the extent number field of an FCB and is a one-byte field at FCB + 12, where FCB labels the first byte in the FCB. Depending on the block size (BLS) and the maximum data block number (DSM), an FCB can contain 1, 2, 4, 8, or 16 extents. The EX field is normally set to 0 by the user but contains the current extent number during file I/O. The term FCB folding describes FCBs containing more than one extent. In CP/M version 1.4, each FCB contained only one extent. Users attempting to perform random record I/O and maintain CP/M 1.4 compatiblity should be aware of the implications of this difference. See CP/M 1.4 compatibility.
A group of contiguous data blocks allocated for a table, index, or cluster. Extents are added dynamically as needed.
On Files--11 volumes, contiguous blocks allocated to a particular file.
Every 256-page allocation unit is divided into 32 structures called extents, each containing 8 contiguous pages. Each extent contains information about those 8 contiguous pages, including a bitmap showing pages in use and a bitmap showing pages to be deallocated.
For the volume structure and the ISO 9660 file structure, an extent is defined as a set of logical sectors, which contains the logical sector numbers that form a continuous ascending sequence. The address, or location, of an extent is the number of the first logical sector in the sequence. For the UDF file structure, an extent is defined as a set of logical blocks that contains the logical block numbers that form a continuous ascending sequence. father The metal master disc formed by electroplating the glass master. The father disc is used to make mother discs, from which multiple stampers (sons) can be made.
A logical unit of database storage space allocation made up of a number of contiguous data blocks.
An extent is a contiguous set of Oracle blocks allocated to a segment in a tablespace. The size of an extent is controlled by storage parameters used when you CREATE or ALTER the segment, including INITIAL, NEXT and PCT_INCREASE.
An extent is a contiguous area of storage in a computer file system, reserved for a file. When starting to write to a file, a whole extent is allocated. When writing to the file again, possibly after doing other write operations, the data continues where the previous write left off.