>Still, if MI now supports Oracle's SDO_GEOMETRY and the accompanying
linear
>quadtree indexes (aaacck), what becomes of SW_GEOMETRY, and the R-trees?
Our SpatialWare boys report:
It is possible to have both and SDO_GEOMETRY and and SW_GEOMETRY in the
same
database however R-trees are not supported. Feedback to Oracle from
customers
can result in product changes so if you want to see 8i spatial support
R-trees,
then let Oracle know.
The extender lets you read an SW_GEOMETRY and write it as an SDO_GEOMETRY
(using a caste) and vica versa . If you are using splines and arcs in
SW_GEOMETRY you will need to continue using SW_GEOMETRY until this support
appears in SDO_GEOMETRY. If you want to use the spatial extender cartridge
for this, you will need to use the quad tree index if you wish to avoid
SpatialWare 'middleware'. The extender functions work on both geometry
types.
The quadtree will perform well if you use the correct grid parameters. So
you do have to know your data better than you do with a R-tree (there is
an admin. tool that helps).
If you need to know more details about what the extender does, this
information is available from MapInfo.
SpatialWare is also available as an Informix blade and an IBM true
extender.
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