Thank You Kevin and Steeve for your suggestions. I am still working on this performance issue and keeping all these points in mind.
Actually the scenario is ,
Using the SAP interface and the extra connector (odbc driver) trying to connect mongodb and extracting data from mongodb to the oracle database and it perform very slow process.
Analysis:
Checked the mongodb log. I found the opened connections but it is not ended and while loading data to the oracle data base,the job getting stuck in middle ,which is running in SAP system.