I am working in GIS domain using ESRI technology. I want to use QGIS desktop to access ArcSDE dataset from a local machine. I have already installed Oracle Client 10g and QGIS Desktop 2.8.1 through network installer of OSGeo4W. But I am unable to connect to the Oracle database and ArcSDE dataset("Driver Not loaded" error is coming). Kindly suggest me about the software requirements, installation process, plugins required, new Oracle database and ArcSDE connection process, configuration process etc., so that I can implement the same in my project and fulfil the requirment. Software version used-: Oracle database=10.2.0.1 on IBM AIX OS, Oracle Client=10.2.0.1, QGIS Desktop=2.8.1, ESRI=9.3.1, Local m/c=Windows 7 If you can provide me the required steps in detail format, then it will be helpful for me.