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Oracle 11g R1/R2 Real Application Clusters Essentials by Syed Jaffer Hussain, Ben Prusinski

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ASM instance configuration and management

Staring with 10g R1 and onwards, Oracle supports two types of instances: RDBMS and ASM. An ASM instance is a special kind of instance with only Shared Global Area (SGA) that typically consists of memory components such as Shared Pool, Large Pool, Free Memory and ASM Cache, and a set of default background process, with some additional ASM-specific background processes. The ASM instance doesn't hold any physical structure and the name of the instance typically starts with +ASM. The instance would be generally named as +ASMn (where n represents the instance number) in a cluster environment. The INSTANCE_TYPE initialization parameter controls the role played by these two instances. The ASM instance configuration ...

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