How to add constraints without validating data.

Hi Gurus

Is there any way in postgreSQL to apply constraints forcefully without checking/validating Data ? It should validate only those records which comes after constraints are applied.

I need this help as data is already loaded in database but "ALTER TABLE" sql for adding CONSTRAINTS is taking enormous time.

Thanks for ideas/suggestion in Advance !!

Regards,

Amit Jain 
Synechron Technologies Pvt. Ltd. 4th  Floor, B Wing, Block 1.2, Embassy Techzone,
Rajiv Gandhi Infotech Park, Hinjewadi Phase II, Pune 411 057. 
Phone : +91.20.40262000 Ext 2163 | Mobile:+91.9561298565 | VoIP : +1.732.415.0894
http://www.synechron.com  MailTo: amitjain@synechron.com