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

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Oracle RAC Wait Events

An event can be defined as an operation or a particular function that the Oracle kernel performs on behalf of the user session or its own background process. Tasks such as reading and writing data blocks to and from datafiles, receiving data from other instances’ memory, and waiting for the permission to read and acquire the block from the resource master are known as database events, and they have specific names. But why are these events called wait events?

All sessions accessing Oracle database instances need resources to perform their tasks concurrently and independently. A resource may be a data buffer, a latch, an enqueue (lock), or a piece of code to be executed exclusively. Some of these resources are serialized ...

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