Database Reference
In-Depth Information
Figure 7-2. With smaller squares, we have more squares to check, but they have an area closer to
that of the circle of interest. The circle now intersects 13 squares, but only 2 segments with no in-
tersection will be scanned, and those segments are shorter than before because the squares are
smaller.
It is sometimes not possible to find a universal size of square that works well for all of the
time series in the database. To avoid that problem, you can create an adaptive spatial index in
