Question
How do I set up a dNS database?
Answer
If a malicious entity is able to perform a DNS zone transfer they can launch a Denial of Service attack against that zone's DNS servers by bogging them down with many multiple requests. Not only can the name servers be made slow and unresponsive, in some cases this can lock-out the ability to do legitimate DNS updates by keeping the DNS servers database backend in a "write lock" mode.
— Source: Wikipedia (www.wikipedia.org)