If there is a query in that 9 second window then named will make a query to repopulate the cache. If there is not a query then the records will expire. You only want to prefetch records that are being queried for regularly.
On 18/05/2014, at 17:18, Hongyi Zhao <hongyi.z...@gmail.com> wrote: > What do you mean by saying that "Prefetch does not cause named to ignore > TTLs"? > > I think in my case, I have set the preftch option like this: > > -------------- > prefetch 2 9; > -------------- > > This will enable the prefetching for all of the entries with the TTL larger > that 2 seconds, (in my case, the TTL is 60 seconds, so the prefetch will be > enabled for this entry). The digit 9 triggering condition for doing the > prefetching. In my case, it should mean that when 51 seconds elapsed for the > entry, i.e., 9 = 60 - 51, the bind will prefetching the record, and then the > record will have a full TTL, i.e., 60 seconds for this case again. > > Am I wrong about the meaning of the prefetching function of bind or not? > > Regards > Zhao > > > 2014-05-18 13:46 GMT+08:00 Leonard Mills <l...@yahoo.com>: >> Taking the CNAME line in the response, please notice that the published TTL >> is 60 seconds. Prefetch does not cause named to ignore TTLs. >> >> hth, >> Len > > > > -- > Hongyi Zhao <hongyi.z...@gmail.com> > Xinjiang Technical Institute of Physics and Chemistry > Chinese Academy of Sciences > GnuPG DSA: 0xD108493 > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users
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