dump the name server cache to the file

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The ndc dumpdb command or the SIGINT signal causes named to dump the name
server cache to the file /var/tmp/named_dump.db. The following example
uses the signal:

# kill -INT ‘cat /etc/named.pid’
The process ID of named can be obtained from /etc/named.pid, as in the
example above, because named writes its process ID in that file during
startup.[152″>

[152″>On our Linux system the process ID is written to /var/run/named.pid.

Once named writes its cache to the file, we can examine the file to see if
the names and addresses servers are correct. The named_dump.db file is
composed of three sections: the zone table section, the Cache & Data
section, and the Hints section.

http://kore.hack.se/oreilly-networking/tcp/ch13_06.htm

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