> Hi Andrea
>
> the dataset is no very large. It contains aprox. tuples.

Aprox how many? :-)

> The dataset is generated dynamically use REST.
>
> The bounding box is NOT close to 100%. Because this is something that has to
> be computed after the termination of the calculation.
> Maybe this causes the error: because initially, when loading the layer I do
> not set a MBR that is respectively larger

Hum. no, the thing is, the query plan generated by Oracle for prepared
statements assumes often assumes using the spatial index is efficient,
but in case you're asking for the whole dataset a sequential scan
is (a lot) faster.

>
> You can see the example on my url:
>
> http://www.isochrones.inf.unibz.it/minex/

Tried a bit, there is a long wait while the system computes the isocrones
(there is a sort of white popup in the middle, with no text or images, which
I guess should be a "wait/computing" message), once that is removed
the tiles are coming back fast (tried up to 60 minutes isocrones).

Cheers
Andrea

-- 
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead

Via Poggio alle Viti 1187
55054  Massarosa (LU)
Italy

phone: +39 0584 962313
fax:      +39 0584 962313
mob:    +39 339 8844549

http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
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http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf

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