Foriegn Keys?

I have a database system in which i truncate a main table to update the information.  I would like to setup some foriegn keys referencing back to that table but am concerned as to how the truncating of the Parent table will effect the keys?  Would all I have to do is insure that I vacuum the db after I truncate and repopulate the table?

---

		Brian C. Doyle
		Director, Internet Services
		United Merchant Processing Association
		http://www.umpa-us.com
		1-800-555-9665 ext 212