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locality of reference

   Also found in: Wikipedia 0.04 sec.

Also known as "locality in space" and "spatial locality," it refers to the fact that most instructions in a program are in routines that are executed over and over, and that these routines are in a reasonably confined area. It also refers to data fields in close proximity to each other.

This is the principle behind memory and disk caches, in which data or instructions are placed in higher-speed memory and get read many times before the memory is overwritten by another set. See cache.
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Read-intensive applications such as OLTP require large numbers of random read requests and represent a good locality of reference or a high hit-ratio, making it best suited as a disk-caching application.
Storage Intensive Applications by Moore, Fred / Computer Technology Review
The large data set with low locality of reference results in high data cache miss rates and low (less than 30%) effective utilization of a single-threaded processor.
Lexra Announces Highest Performance 32-bit RISC Processor For New ... by Business Wire
Read caching is based on the locality of reference principle--applications are more likely to reference data that is stored in close proximity to previously referenced data than they are to reference data stored on distant areas of the disk.
Optimizing RAID Controllers by Smith, Kevin / Computer Technology Review
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