Graph issue - Aggregated Data Applictaion

Graph issue - Aggregated Data Applictaion

Hello everyone,

I have netflow analyzer 9.8.6 build 9860 installed on a 64 bit linux machine 8 GB RAM. The data base used is MYSQL
I am facing issue related to application graph that is the graph is not visible for for than 1 hour. Graphs are attached for 1 hour, 2 hour and 6 hour in which it can be seen that the 2 hour and 6 hour graphs are totally unaccounted.
Please suggest resolution measures