ABSTRACT
Optimizing queries over XML streams has been an important and
non-trivial issue with the emergence of complex XML stream applications
such as monitoring sensor networks and online transaction
processing. Our system, R-SOX, provides a platform for
runtime query optimization based on dynamic schema knowledge
embedded in the XML streams. Such information provides refined
runtime schema knowledge thus dramatically enlarged the opportunity
for schema-based query optimizations. In this demonstration,
we focus on the following three aspects: (1) annotation of
runtime schema knowledge; (2) incremental maintenance of runtime
schema knowledge; (3) dynamic semantic query optimization
techniques. The overall framework for runtime semantic query
optimization, including several classes of dynamic optimization
techniques, will be shown in this demonstration