How Is sdo_geom.sdo_distance calculated in geodetic space?

Hi,
I'm new to oracle spatial -- but very familiar spatial SQL in Manifold GIS. In that package, there are two distance functions, a "distance", which returns the distance in native coordinates, and a "distanceEarth", which is used to return true distance (in meters) rather than degrees when working in lat/lon. When I author a basic distance query in oracle which finds the distances between all the geometries in one table and all the geometries in another table, the sgo_geom.sdo_distance will return the result in meters even when I am working in lat/lon. So when does the oracle distance function convert between degrees and meters? Is it really returning the true distance? In this clear?
thanks!

In Oracle Spatial, we always return the true distance based on the coordinate system
of the geometry.
If the geometry has lat/long values for coordinates, and appropriate SRID is set,
we compute the true earth distance.
If there is no SRID set for the geometry, the distance returned will be computed
as if the long/lat values are x,y values.
siva

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How Is sdo_geom.sdo_distance calculated in geodetic space?

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