Linux - Oracle - DBA

Oracle RAC Init Parameters

Date: 2010-02-06T09:14:00.000+04:00
Parameters that Must Have Unique Settings on All Instances on Oracle RACINSTANCE_NUMBER  :                                          Oracle RAC uses the INSTANCE_NUMBER parameter to distinguish among instances at startup. Oracle RAC uses the number value of the THREAD parameter to assign redolog groups to specific instances. To simplify administration, use the same number for both the THREAD

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About Oracle RAC

Date: 2010-02-02T14:34:00.001+04:00
Oracle RAC extends Oracle Database so that you can store, update, and efficiently retrieve data from multiple instances on different servers at the same time. Oracle RAC provides the software that allows the servers to work together in what is called a cluster. The physical structures that make up the database must reside on shared storage that is accessible from all servers that are part of

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How to determine High Availability Requirements

Date: 2010-01-27T12:58:00.001+04:00
Business perceptive of High availability is different for managers /decision makers compared to technicians or DBA etc.An analysis of business requirements for high availability combined with an understanding of the level of investment required to implement different high availability solutions enables the development of a high availability architecture that will achieve both business and

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Causes of Planned Downtime

Date: 2010-01-27T12:39:00.000+04:00
1 )System and database changesPlanned system changes occur when performing routine and periodic maintenance operations and new deployments.Planned system changes include any scheduled changes to the operating environment that occur outside the organizational data structure in the database.The service level impact of a planned system change varies significantly depending on the nature and

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Causes of Downtime

Date: 2010-01-27T12:32:00.000+04:00
Downtime is the most threatening word in DBA life , no one want their db to be down. There are two types of down time planned, unplanned downtime. Down time is critical thing when it comes with HA architecture.  One of the challenges in designing a high availability solution is examining and addressing all of the possible causes of downtime. It is important to consider causes of both unplanned

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