Abstract
Max and Min are two important aggregates in the Data Stream Management System (DSMS). A novel mechanism called the exemplary sketch was proposed to evaluate Max and Min over sliding windows with various sizes in the real time data stream environment. With this method we no longer need to buffer all the tuples to fall into current sliding windows, which means we can reduce the space cost remarkably. Because of this, the processing time can also be reduced dramatically. Experimental results show that the sketch scheme yields very good performance on both space and time cost.
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