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9-4 Oracle Complex Event Processing Visualizer Users Guide

9.7 Persistent Event Store Management

The Oracle CEP event repository feature allows you to persist the events that flow out of a component of the event processing network EPN to a store, such as a database table, and then play them back at a later stage or explicitly query the events from a component such as an event bean. By default, Oracle CEP stores recorded events in a database, which means that before you can start using the record and playback feature in your own application, you must specify where the database server is located along with the name of the database server that will contain the recorded events. For more information, see: ■ Chapter 17, Managing the Persistent Event Store ■ Storing Events in the Persistent Event Store in the Oracle Complex Event Processing Developers Guide for Eclipse

9.8 Multi-Server Domain Management

An Oracle CEP multi-server domain or cluster is a set of two or more servers logically connected for the purposes of management, and physically connected using a shared User Datagram Protocol UDP multicast address and port. All servers in an Oracle CEP multi-server domain are aware of all other servers in the domain and any one server can be used as an access point for making changes to the deployments in the domain. Oracle CEP supports the following clustering systems: ■ evs4j: Oracle CEP native clustering implementation. ■ Oracle Coherence: a JCache-compliant in-memory distributed data grid solution for clustered applications and application servers. It coordinates updates to the data using cluster-wide concurrency control, replicates data modifications across the cluster using the highest performing clustered protocol available, and delivers notifications of data modifications to any servers that request them. You take advantage of Oracle Coherence features using the standard Java collections API to access and modify data, and use the standard JavaBean event model to receive data change notifications. Note: Before you can use Oracle CEP with Oracle Coherence, you must obtain a valid Oracle Coherence license such as a license for Coherence Enterprise Edition, Coherence Grid Edition, or Oracle WebLogic Application Grid. For more information on Oracle Coherence, see http:www.oracle.comtechnologyproductscoherence index.html .