how to modify the cache

[houguanghua]

Hi all,
Bind provides rndc  tools to operate the cache. But how to change a record in the cache. For example:
    to modify origin record   " www.abc.com  A  IN  219.142.3.1 " into "www abc.com A IN 143.3.1.20".
I just know that using "rndc flush" to clear the cache, but don't know how to modify the cache.
 
Who can tell me how to do?Thanks.
Guanghua
 		 	   		  
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