Thank you Arun.
I am aware that it has to be with DBA but DBA is saying that it is not DB issue as I can see maximum sessions allowed are much higher than what BO is creating.
About ndbqthreads and maxobjectsincache. I tried those options too but did not worked. As per my info ndbqthreads and maxobjectsincache work composite to each other. i.e. if number of connections are less then DB traffic will be high. and if Cache is more than traffic will be less. I tried those options as well. But working as such.
Regards,
Mandar