I am using linq to Nhibernate to fire some select query to data base.
My question is, how do I know, the query generated by Fluent NHibernate?
You can also hook in log4net.
Definitely buy and use NHProf. This is an awesome product and not only shows you what queries are being run, but also shows you any potential performance problems with your NHibernate mappings and queries.