Tim Bass
09-05-2008 10:39 AM
In
More Towards a Streaming SQL Standard, Marc Adler says,
“Despite what I think about Streambase’s marketing and sales organization, you must admit that Zdonik and Cherniack are first-class researchers, and have contributed a lot to the field of CEP.”
I agree that these gentlement*are top notch researchers, witnessed by the fact that the authors do not mention nor claim to be “complex event processing” anywhere in their paper!* This paper is not about CEP, nor does it*claim to be about CEP,*it is about stream processing and unifying SQL standards.
ABSTRACT: This paper describes a unification of two different SQL extensions for streams and its associated semantics. We use the data models from Oracle and StreamBase as our examples. Oracle uses a time-based execution model while StreamBase uses a tuple-based execution model. Time-based execution provides a way to model simultaneity while tuple-based execution provides a way to react to primitive events as soon as they are seen by the system.
Asmentioned on numerous occasions, stream processing is*a very important area in CEP/EP.** It is important not to confuse the higher situational knowledge from object-object correlation and state management*with the single-object event refinement that occurs in stream processsing.*** Event stream processing is fundamentally different than complex event processing.*
Event stream processing performs operations on streaming event objects.** In almost all advanced CEP/EP applications is is necessary to perform robust track and trace operations on streaming event objects, like tracking the position of an airplane.*** Tracking the position of an aircraft can be modelled very nicely with event stream processing.* Tracking individual event objects is a precuror to multiclass object situation refinement.
When we manage the state of all the aircraft in the skies over New York, you need more than a stream processing construct.* You need to manage the state of all the aircraft.* Paul Vincent of TIBCO Software*being to address*this important point in
The Value of State...**
Again, we will be better equiped to solve complex distributed event processing problems if we do not confuse the notion of event stream processing and complex event processing.** These technologies are indeed complimentary, both very important, but they are not the same.
I applaud Oracle and StreamBase’s work toward a unified standard for
SQL extensions for streams.
Source...
