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Shared nothing architecture
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Shared nothing architecture : ウィキペディア英語版
Shared nothing architecture
A shared nothing architecture (SN) is a distributed computing architecture in which each node is independent and self-sufficient, and there is no single point of contention across the system. More specifically, none of the nodes share memory or disk storage. People typically contrast SN with systems that keep a large amount of centrally-stored state information, whether in a database, an application server, or any other similar single point of contention.
The advantages of SN architecture versus a central entity that controls the network (a controller-based architecture) include eliminating single points of failure, allowing self-healing capabilities and providing an advantage with offering non-disruptive upgrades.
==History==
While SN is best known in the context of web development, the concept predates the web: Michael Stonebraker at the University of California, Berkeley used the term in a 1986 database paper.〔[http://db.cs.berkeley.edu/papers/hpts85-nothing.pdf The Case for Shared Nothing Architecture by Michael Stonebraker. [Originally published in ''Database Engineering'', Volume 9, Number 1 (1986).]](PDF)〕 In it he mentions existing commercial implementations of the architecture (although none are named explicitly). Teradata, which delivered its first system in 1983, was probably one of those commercial implementations. Tandem Computers officially released NonStop SQL, a shared nothing database, in 1984.〔NonStop SQL, A Distributed, High-Performance, High-Availability Implementation of SQL, Tandem Technical Report TR-87.4, http://www.hpl.hp.com/techreports/tandem/TR-87.4.pdf〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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