Why is too long connecting to Oracle Spatial database from QGIS client?

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I am having trouble connecting to an Oracle Spatial data with QGIS client. I use QGIS Version 2.2 (Valmiera) to connect to a database schema in Oracle Spatial.I asked our DBA access to our database stored in Oracle Spatial. He granted me some privileges on some tables to perform Select statements. However, once I set my access I experienced difficulties with slow connection to the Oracle Spatial database. To connect to the schema tables, the connection can last 5-8 minutes. The geometric tables to which I connect have more than 3600 polygons.

Could you confirm me if this is due to a configuration problem or a bad customer optimization QGIS Oracle Spatial.

I would appreciate any feedback about this issue for those who use QGIS as client to Oracle Spatial at office.



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