Row level security

Hi all,

My company is being asked to look into setting up row lever security on our databse. I admit, I dread the thought of having to add this level of security. My understanding is that it is a big performance hit. We will be needing to add this security to 20 to 30 tables out of 100 tables. Some of these tables contain 100,000s of rows. How bad is this performance hit? Also, how does it affect existing code and future developement?

We are checking into a product called DB Fortify from Three Tier. Is this a good product?

Any info will be appreciated.

Thanks,
Steven
http://www.blkbox.com/~swhatley/

                      _|_  |  _|_   "I am the way and the truth and
Steven Whatley         | --|-- |    the life.  No one comes to the
swhatley_at_blkbox.com    |   |   |    Father except through me."
Houston, Texas             |            -- Jesus Christ (John 14:6 NIV)
                           |