With bounded resources, traditional DBMS can't process and query the continuous and unbounded data stream in real time, and DBMS is researched widely as a new method to deal with this problem. The efficiency of the process and the query is improved with the new operator and the new query model introduced in DBMS. Firstly, the DSMS concept is introduced, and the principle of DSMS as well as the architecture of DSMS is discussed. Finally several typical DSMS instances are introduced and compared.
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