Tuesday, March 11, 2014

RAC Concepts

RAC Concepts

RAC Concepts

A cluster comprises multiple interconnected computers or servers that appear as if they are one server to end users and applications. Oracle RAC enables you to cluster an Oracle database. Oracle RAC uses Oracle Clusterware for the infrastructure to bind multiple servers so they operate as a single system.

Oracle Clusterware is a portable cluster management solution that is integrated with Oracle Database. Oracle Clusterware is also a required component for using Oracle RAC. In addition, Oracle Clusterware enables both noncluster Oracle databases and Oracle RAC databases to use the Oracle high-availability infrastructure. Oracle Clusterware enables you to create a clustered pool of storage to be used by any combination of noncluster and Oracle RAC databases.

Oracle Clusterware is the only clusterware that you need for most platforms on which Oracle RAC operates. You can also use clusterware from other vendors if the clusterware is certified for Oracle RAC.

Noncluster Oracle databases have a one-to-one relationship between the Oracle database and the instance. Oracle RAC environments, however, have a one-to-many relationship between the database and instances. An Oracle RAC database can have up to 100 instances all of which access one database.

Objectives

  • Explain the necessity of global resources
  • Describe global cache coordination



Topics

  1. Benefits of Using RAC
  2. Clusters and Scalability
  3. Necessity of Global Resources
  4. Global Cache Service and Global Enqueue Service
  5. Cache Fusion and Resource Coordination
  6. Global Resources Coordination
  7. Past Image
  8. Global Cache Coordination Example
  9. Write to Disk Coordination Example
  10. Dynamic Reconfiguration
  11. Object Affinity and Dynamic Remastering
  12. Global Resource Background Processes



Refer the links below:

Introduction to Oracle RAC
Oracle Real Application Clusters (RAC) 11g Release 2





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2 comments:

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    excellent summary

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