Abstract: Query processing mechanisms of data stream were investigated in this paper and we proposed a dynamic optimum strategy, which is based on multiple factors, namely MultiFactor. This strategy decides a scheduling sequence by the number of tuples which consumed by a operator per unit time. Scheduling timcslices arc decided by deadline of a query. Also the paper proposed a Scheduling method of multi-stream join queries. hhis paper gave the adaptive optimizalion of the timing and the a山ust strategy of MultiFactor.

Key words: Data stream, Query optimum, Scheduling strategy, Adaptive query