clients-per-query message is harmful or not?

[MontyRee]

Hello, all.
 
my system is centos 4.x, bind 9.5.1-P3 and only recursion is allowed from some ranges.

I can see lots of messages like below.
so if I didn't set any clients-per-query value,some clients' queries may be droppped or not? 
If some queries can be dropped,I want to set like "clients-per-query 0".   
 
 
05-Oct-2009 16:04:46.228 resolver: notice: clients-per-query decreased to 14
05-Oct-2009 16:14:47.337 resolver: notice: clients-per-query increased to 19
05-Oct-2009 16:34:47.338 resolver: notice: clients-per-query decreased to 18
05-Oct-2009 16:54:47.339 resolver: notice: clients-per-query decreased to 17
05-Oct-2009 17:01:55.424 resolver: notice: clients-per-query increased to 22
05-Oct-2009 20:20:26.252 resolver: notice: clients-per-query increased to 15
05-Oct-2009 20:40:26.253 resolver: notice: clients-per-query decreased to 14
05-Oct-2009 21:00:26.253 resolver: notice: clients-per-query decreased to 13
05-Oct-2009 21:11:26.298 resolver: notice: clients-per-query increased to 15

 
 
Thanks in advance.
  		 	   		  
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