How often is it suggested to restart Bind8 ?

[Gildas PERROT]

Hi,

I am using bind8.2.2p5 as a primary server on Solaris 2.6. I found
that the cache is growing a lot and sometimes it would be good to
clean it by a restart. How often is it suggested to restart it ?

Thanks in advance for your help.		Gildas.
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