recursive-clients, what value ?

[Mikael]

Hello,

I'm working on bind 9.2 on linux mandrake and I had lots of logs 
containing :

Jun 14 09:23:30 hostname named[1045]: client: client 127.0.0.1#34559: no 
more recursive clients: quota reached
Jun 14 09:25:22 hostname named[1045]: client: client 127.0.0.1#34565: no 
more recursive clients: quota reached

I read that increasing "recursive-clients" could help. I'm going to set 
it to 2000 but is there a way to know what would be a good value ?
Is there a way to monitor in real time the number of simultaneous clients ?

Thanks in advance,

Mikael