secondary DNS server is meaningful?

[SB CH]

>No.  All servers are used - roughly equally.
Thanks for your answer.
then 
1. what's happening if the secondary DNS is down or not exist?
2. what's happening if the primary DNS information and secondary DNS 
information is not like?
3. what's happening if the primary DNS information is correct but secondary 
DNS has no data?
4. anyone who knows the document or site about the role of the secondary 
DNS server?
5. I have lots of domains at one DNS server(secondary DNS is stopped), but 
I didn't have some problems up to now, what's the meaning?


So thanks in advance.
  


> > Hello all.
> >
> > I would like to know the rule of the secondary DNS.
> > secondary DNS is just backup?
>
>No.  All servers are used - roughly equally.
>
> > so it is useless to operate secondary DNS if primary DNS is operated 
well?
> > But some case, a domain is not resolved properly when setup at just
>primary
> > DNS server.
> > So I guess that the primary and secondary is important alike, right?
> > I woule like to know the real role of the secondary DNS.
> > just backup or not?
> >
> > Thanks in advance.
> >
> >
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