Scalability
Scalability in BIND 9 is better in several ways. One is that it can be used for zone storage methods other than zone files. Thus, on-demand loading of zone data from databases of your choice will be possible in the future. This is especially beneficial for those who run nameservers with thousands of zones that take a long time to restart (nameservers taking more than 30 minutes to restart is not unheard of).
Another scalability issue is zone transfers for such massive nameservers. A built-in named-xfer helps solve that problem.
Use of lightweight threading in the application programming helps make all this easy within one instance of named. The use of threads also enables named to take advantage of multiprocessor systems, such that ...
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