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Oracle RAC
In database computing, Oracle Real Application Clusters (RAC) — an option〔(Options and Packs )〕 for the Oracle Database software produced by Oracle Corporation and introduced in 2001 with Oracle9i — provides software for clustering and high availability in Oracle database environments. Oracle Corporation includes RAC with the Standard Edition, provided the nodes are clustered using Oracle Clusterware.〔(Oracle Database Editions )〕
==Functionality==
Oracle RAC allows multiple computers to run Oracle RDBMS software simultaneously while accessing a single database, thus providing clustering.
In a non-RAC Oracle database, a single instance accesses a single database. The ''database'' consists of a collection of data files, control files, and redo logs located on disk. The ''instance'' comprises the collection of Oracle-related memory and operating system processes that run on a computer system.
In an Oracle RAC environment, 2 or more computers (each with an Oracle RDBMS instance) concurrently access a single database. This allows an application or user to connect to either computer and have access to a single coordinated set of data.
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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