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Gil Fink, Microsoft MVP, is an expert in Web development and Microsoft data platform. He works as a senior architect at Sela Group. He is currently consulting for various enterprises and companies, where he architects and develops Web and RIA-based solutions. He conducts lectures and workshops for developers and enterprises who want to specialize in infrastructure and Web development. He is also a co-author of several Microsoft Official Courses and training kits. You can read his publications at his blog: Gil is a DZone MVB and is not an employee of DZone and has posted 151 posts at DZone. You can read more from them at their website. View Full User Profile

EFProf – Profiler Tool for Entity Framework

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One of the important tools in your tool arsenal when you develop with an ORM tool is a profiler. Like SQL profiler to a SQL Server DBA an Entity Framework profiler is a must have tool to Entity Framework developer.

The main reasons to acquire such a tool are to understand what is going on underneath the hood in the query engine and for performance tuning. If you think that you can use Entity Framework without knowing what it is committing to database then you should think again. Things like select N+1 or avoiding too many joins will get back at you during runtime and kick you in the face.

EFProf is an Entity Framework profiler from Hibernating Rhinos.
It includes a very intuitive views/reports and supply a lot of valuable information about what is going on when you use Entity Framework. It also provides a lot of performance alerts which can lead you to find bottle necks or problems in writing the data access queries. Behind the tool you can find Oren Eini (Ayende) which is very known for his support for NHibernate and he brings tones of knowledge in the ORMs world to the tool.

How to Get Started with EFProf

When you want to use EFProf you first need to do the following things:

  • Add reference to the HibernatingRhinos.Profiler.Appender dll in your application.
    The dll can be found in the tool folder.
  • In the application start you will call the following line of code:
  • Now start the profiler application and then run your application and get the profiler input.

Easy as that.

Using the Tool

When you start the profiler you will get the following screen:

After I configured my test application and ran it I got the following screen with all the information I needed:

You can see the queries that I run at the bottom, application statistic at the left menu and more important stuff which gives you very crucial details about your running application. You can also get analysis of your code in the left menu such as:

One feature that I really liked and made me feel like a DBA was the ability to see the query plan of the query in a visual way:

And of course the ability to run your queries from the profiler:

The tool also supports alerts about common mistakes that you can do when you program against an ORM.


Profiling your application is a very important aspect for gaining better performance and learning what you are doing in code when you use a tool that you didn’t write. Blind development without understanding what is going inside a development tool is something that will get back at you after deployment. EFProf supply the insight on what is going on and is a very helpful tool to have.
As a last word, since EFProf is a commercial tool this is my opinion that is expressed in this post and I wasn’t contact by Hibernating Rhinos.

Published at DZone with permission of Gil Fink, author and DZone MVB. (source)

(Note: Opinions expressed in this article and its replies are the opinions of their respective authors and not those of DZone, Inc.)