[fdo-internals] RE: FDO Function SpatialExtents

[Haris Kurtagic]

Thank you.
On my test data set Autodesk provider was returning SpatialExtents very
fast in case were SDO_AGGR_MBR would take few seconds to execute.
Few days ago I was looking at Oracle log and I saw queries runned by
Autodesk provider.

I was almost certain that Autodesk provider is not iterrating trough all
geometries. I guess I would have to spend more time on it :(

Haris


-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Dan Stoica
Sent: Wednesday, November 19, 2008 4:15 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] RE: FDO Function SpatialExtents

> I think Autodesk.Oracle provider is calculating from SDO_ROOT_MBR data
only

No, for geodetic CS Autodesk.Oracle provider is doing a brute force
calculation using a select at OCI level.

Dan.

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris
Kurtagic
Sent: Tuesday, November 18, 2008 5:03 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] RE: FDO Function SpatialExtents

SDO_TUNE.EXTENT_OF has few limitations like schema access and only works
for particullar number of dimensions
and still takes some time to calculate.

I think Autodesk.Oracle provider is calculating from SDO_ROOT_MBR data
only (it is not exact extent in any case ).
I am hoping that formula will be shared here :)

Haris

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Jason Birch
Sent: Tuesday, November 18, 2008 10:28 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] RE: FDO Function SpatialExtents

What does

SELECT SDO_TUNE.EXTENT_OF('TABLENAME','GEOMCOLUMN') FROM DUAL

Give you for a geodetic table?

This post makes it look like retrieving the MBR of geodetic CS from the
index metadata table is non-trivial:

http://kr.forums.oracle.com/forums/thread.jspa?threadID=523315

Jason

From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris
Kurtagic
Sent: Tuesday, November 18, 2008 13:20
To: FDO Internals Mail List
Subject: RE: [fdo-internals] RE: FDO Function SpatialExtents

SDO_ROOT_MBR is not even close to layer extent for geodetic CS.

Any clue how Autodesk.Oracle provider is calculating index extent from
that SDO_ROOT_MBR  for geodetic CS?
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