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Applying and Extending Oracle Spatial by Siva Ravada, Simon Gerard Greener

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Physical and logical standby database

Oracle provides two features that support high availability of the database. In this context, availability is the extent to which a database is accessible on demand. The availability of a database is measured by the perception of an end user. A highly available system is accessible to the end users 24/7. A database might become unavailable due to hardware or software problems. The only way to build a highly available system in the face of hardware failure is to have a secondary or an alternate database running on a separate hardware system. A software failure or data corruption can also make the database unavailable. In such cases, a separate system can be used as a failover system such that all the users ...

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