Problem with change of shared secret

[Vishwanath Srikant Pattanshetti]

All 
I am using FreeRADIUS 1.1.0 with Oracle 10. 
Am storing the clients data in database table 'nas' 

When I change the shared secret entry in this table the RADIUS server
which is 
Already running does not seem to pick this change, and I get an error
saying invalid 
Authenticator - however this problem does not occur if I restart the
RADIUS server. 
Is there a way I can make the RADIUS server pick up changes to the 'nas'
table dynamically?

Any help would be a great help. 

-vishwa.