Preface

This reference contains a complete description of the Oracle Continuous Query Language (Oracle CQL), a query language based on SQL with added constructs that support streaming data. Using Oracle CQL, you can express queries on data streams to perform complex event processing (CEP) using Oracle CEP. Oracle CQL is a new technology but it is based on a subset of SQL99.

Oracle CEP (formally known as the WebLogic Event Server) is a Java server for the development of high-performance event driven applications. It is a lightweight Java application container based on Equinox OSGi, with shared services, including the Oracle CEP Service Engine, which provides a rich, declarative environment based on Oracle Continuous Query Language (Oracle CQL) - a query language based on SQL with added constructs that support streaming data - to improve the efficiency and effectiveness of managing business operations. Oracle CEP supports ultra-high throughput and microsecond latency using JRockit Real Time and provides Oracle CEP Visualizer and Oracle CEP IDE for Eclipse developer tooling for a complete real time end-to-end Java Event-Driven Architecture (EDA) development platform.

Audience

This document is intended for all users of Oracle CQL.

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Related Documents

For more information, see the following:

• Oracle Fusion Middleware Getting Started Guide for Oracle Complex Event Processing

• Oracle Fusion Middleware Administrator's Guide for Oracle Complex Event Processing

• Oracle Fusion Middleware Developer's Guide for Oracle Complex Event Processing for Eclipse

• Oracle Fusion Middleware Visualizer User's Guide for Oracle Complex Event Processing

• Oracle Complex Event Processing Java API Reference

• Oracle Fusion Middleware EPL Language Reference for Oracle Complex Event Processing

• Oracle Database SQL Language Reference at https://download.oracle.com/docs/cd/B28359_01/server.111/b28286/toc.htm

• SQL99 Specifications (ISO/IEC 9075-1:1999, ISO/IEC 9075-2:1999, ISO/IEC 9075-3:1999, and ISO/IEC 9075-4:1999)

• Oracle CEP Forum: http://forums.oracle.com/forums/forum.jspa?forumID=820

• Oracle CEP Samples: http://www.oracle.com/technologies/soa/complex-event-processing.html

• Oracle Event Driven Architecture Suite sample code: http://www.oracle.com/technology/sample_code/products/event-driven-architecture

Conventions

The following text conventions are used in this document:

Convention	Meaning
boldface	Boldface type indicates graphical user interface elements associated with an action, or terms defined in text or the glossary.
italic	Italic type indicates book titles, emphasis, or placeholder variables for which you supply particular values.
monospace	Monospace type indicates commands within a paragraph, URLs, code in examples, text that appears on the screen, or text that you enter.

Syntax Diagrams

Syntax descriptions are provided in this book for various Oracle CQL, SQL, PL/SQL, or other command-line constructs in graphic form or Backus Naur Form (BNF). See "How to Read Syntax Diagrams" in the Oracle Database SQL Language Reference for information about how to interpret these descriptions.