Time Responsive External Data
نویسندگان
چکیده
We develop external data structures for storing points in one or two dimensions, each moving along a linear trajectory, so that a range query at a given time tq can be answered eeciently. The novel feature of our data structures is that the number of I/Os required to answer a query depends not only on the size of the data set and on the number of points in the answer but also on the diierence between tq and the current time; queries close to the current time are answered fast, while queries that are far away in the future or in the past may take more time.
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