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Oracle Database 11g Oracle Real Application Clusters Handbook, Second Edition by K Gopalakrishnan

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High Availability

When availability is crucial for a business, extremely high levels of disaster tolerance must allow the business to continue in the face of a calamity, without the end users or customers noticing any adverse consequences. The effects of global companies conducting business across time zones spanning “24 × 7 × forever” operations, e-commerce, and the challenges associated with today’s “flat world” all-drive businesses to achieve a level of disaster tolerance capable of ensuring continuous survival and profitability.

Different businesses require different levels of risk with regard to loss of data and potential downtime. A variety of technical solutions can be used to provide varying levels of protection with respect to these ...

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