Many of these GIS providers include Oracle Spatial technology as part of their product
bundles.
Using the Extensibility Framework in Oracle
Oracle allows users to extend the basic functionality of the database. Oracle??™s extensibility
framework provides entry points in which developers can add their own
features to the existing feature set. By using this framework you can do the following:
Add new relational or set operators for use in SQL statements
These operators can be useful when working with extended datatypes, such as
multimedia or spatial data. You can create relational operators that relate specifically
to a particular datatype, such as the relational operator CLOSER TO,
which you can use in SQL statements that access spatial data.
Create cooperative indexing
Cooperative indexing is a scheme in which an external application is responsible
for building and using an index structure that you can use with complex
datatypes. The indexes created are known as domain indexes.
Extend the optimizer
If you use extended indexes, user-defined datatypes, or other features, you can
extend the statistics-collection process or define selectivity and cost functions for
these extended features.
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