The traditional heuristic algorithm of pushing selection predicates below joins is possibly less efficient for continuous queries,because early selection destroys the ability to share subsequent high cost join processing.

A novel data streams partitioning method is proposed to resolve problems of range-aggregation continuous queries over parallel streams for power industry.

Sensor network in a lot of applications have proposed many new challenge to traditional real-time such as the heterogeneity of the underlying data source or I/O devices,real-time of processing continuous queries and adaptively quality of service etc.

Load shedding for continuous query on different important input streams;

Design and Implementation of Continuous Query Processing Prototype System over Data Streams;

Multiple continuous query optimization over data stream

In order to process CKNN queries on the basis of TPR-tree efficiently,a new spatio-temporal distance metrics minmaxdist(t) was presented as a pruning upper bound.

By introducing directional network distance measurement we proposed the directional network expansion(DNE) algorithm to reduce the network searching cost of CKNN queries processing.