If you have 9.3 or greater you can use rndc to flush the cache for a single
domain.
From DNS and Bind:

BIND 9.3.0 will support flushing all of the records attached to a particular
domain name with rndc flushname. For example:

# rndc flushname cnn.com



On Fri, Aug 1, 2008 at 3:52 AM, ram wrote:

> I sometimes have issues where some domains remain unresolvable ( their
> NS is down ) for sometime and then my caching bind server just caches
> the result even after the problem is solved
>
> Until I restart named, bind gives no DNS records. ( or until cache
> times out )
>
>
> Is there a way I tell bind named for just 1 domain requery the DNS
> records and dont resolve from cache
>
>
> Thanks
> Ram
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--
-Ben Croswell