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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Oracle Database Service in HA Cluster

  1. When the primary node suffers a failure, the Oracle instance is restarted on the surviving or backup node in the cluster.

  2. The fail over process involves moving IP address, volumes, and file systems containing the Oracle data files. In other words, on the backup node, IP address is configured, disk group is imported, volumes are started and file systems are mounted. 

  3. The restart of database automatically performs crash recovery returning to the database to transactional consistent state.

There are some issues connected with Oracle Database fail over one needs to be aware of:

  • On restart of the database, there is fresh database cache (SGA) established and it loses all the previous instance’s SGA contents. All the frequently used packages and statements parsed images are lost.

  • Once the new instance is created and made available on the backup node, all the client connections seeking the database service attempts to connect at the same time. This could result in a lengthy waiting period.

  • The impact of the outage may be felt for an extended duration during the failover process. When there is a failure at primary node, all the relevant resources such as mount points, disk group, listener, database instance have to be logically off-lined or shutdown. This process some time may take considerable time depending on failure situation.

However, when the Oracle Database Cluster is implemented in Parallel, Scalable cluster such as Oracle RAC, there are many advantages and it provides a transparent failover for the clients. The main high availability features include:

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

  • Repairing down production Oracle database systems

  • One-time Oracle tuning evaluation

  • Guru support for your Oracle DBA

  • Installation of Oracle application packages

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