11.4.8 Optimizing Spatial Analysis
InnoDB tables, search operations in columns containing spatial data can be optimized using
SPATIAL indexes. The most typical operations are:
Point queries that search for all objects that contain a given point
Region queries that search for all objects that overlap a given region
MySQL uses R-Trees with quadratic splitting for
SPATIAL indexes on spatial columns. A
SPATIAL index is built using the minimum bounding rectangle (MBR) of a geometry. For most geometries, the MBR is a minimum rectangle that surrounds the geometries. For a horizontal or a vertical linestring, the MBR is a rectangle degenerated into the linestring. For a point, the MBR is a rectangle degenerated into the point.
It is also possible to create normal indexes on spatial columns. In a non-
SPATIAL index, you must declare a prefix for any spatial column except for
InnoDB support both
SPATIAL and non-
SPATIAL indexes. Other storage engines support non-
SPATIAL indexes, as described in Section 13.1.14, “CREATE INDEX Statement”.