RoadToMaster – Oracle Clusterware enables servers to communicate with each other, so that they appear to function as a collective unit. Oracle Clusterware provides the infrastructure necessary to run Oracle Real
Application Clusters (Oracle RAC) and Oracle RAC One Node. The Grid Infrastructure is the software that provides the infrastructure for an enterprise grid architecture. In a cluster, this software includes Oracle Clusterware and Oracle ASM. For a standalone server, the Grid Infrastructure includes Oracle Restart and Oracle ASM. Oracle Database 11g Release 2 combines these infrastructure products into one software installation called the Grid Infrastructure home.
Oracle Clusterware, as part of Oracle Grid Infrastructure, is software that manages the availability of user applications and Oracle databases. Oracle Clusterware is the only clusterware needed for most platforms on which Oracle RAC operates. You can also use clusterware from other vendors in addition to Oracle Clusterware on the same system, if needed. However, adding unnecessary layers of software for functionality that is provided by Oracle Clusterware adds complexity and cost and can reduce system availability, especially for planned maintenance. Continue reading
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