How do I stop reading of detail file after a certain threshold is reached

[Vivek Mehrotra]

Hello,
We are using Freeradius2 with MySQL at the backend.
I understand that the buffered sql takes care of buffering queries. What is the 
best way to stop querying MySQL altogether and return a negative response, 
after a certain threshold of processing is reached by the server?
Thanks in advance..
vivek
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