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Getting Started with Oracle Event Processing 11g by Lloyd Williams, Robin J. Smith, Alexandre Alves

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Chapter 7. Using Tables and Caches for Contextual Data

So far we've learned how to create events, assemble, and configure Oracle Event Processing applications. You've learned how CQL is used to process incoming data streams. Sometimes incoming data streams do not contain all of the information that we need for the business logic. In most instances, incoming data streams contain some information about a current transaction, but other information such as customer alert preferences are contained elsewhere. This contextual information is often held in a database table and ideally for low latency applications, pushed to an in-memory cache. It is also sometimes convenient to have application-specific thresholds or other contextual information in a ...

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