I am architecting an application, which will have nearly 10,00,000 (1 million) transactions per day being trading application. I wanted to find whether hibernate will be any bottleneck in performance? This is going to be very very crucial application so decision about using or not using hibernate as OR mapping tool, will be a key decision. Can you guys share your experience especially with dealing with large volum of load? Or should we use simple JDBC?

FYI: We will be using Spring Framework for entire application, which has good support both for JDBC and Hibernate.