1z0-595 Exam Dumps | What does Oracle Spatial use to generate the R-tree spatial index entry for a polygon geometry?

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Question 45/75

What does Oracle Spatial use to generate the R-tree spatial index entry for a polygon geometry?

A. the perimeter of the geometry

B. the minimum bounding rectangle of the geometry

C. the number of ordinates in the geometry

D. the area of the geometry

E. SDO_GTYPEof the geometry

Correct Answer: B

Explanation/Reference:
A spatial R-tree index can index spatial data of up to four dimensions. An R-tree index approximates each geometry by a single rectangle that minimally encloses the geometry (called the minimum bounding rectangle, or MBR), as shown in figure below.

For a layer of geometries, an R-tree index consists of a hierarchical index on the MBRs of the geometries in the layer, as shown in the figure below.

1 through 9 are geometries in a layer.
a, b, c, and d are the leaf nodes of the R-tree index, and contain minimum bounding rectangles of geometries, along with pointers to the geometries. For example, a contains the MBR of geometries 1 and
2, b contains the MBR of geometries 3 and 4, and so on.
A contains the MBR of a and b, and B contains the MBR of c and d.
The root contains the MBR of A and B (that is, the entire area shown).
References: https://docs.oracle.com/cd/B28359_01/appdev.111/b28400/sdo_intro.htm#SPATL459

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