How can I get named.stats file?

[HeePok Lee]

Hi all!
I am using a BIND 8.2.2 P 5 on Solaris.
By the way,
Nevertheless I have options in named.conf file like below, there is not any files except named_dump.db file in /var/adm/syslog/ directory.
How can I get named.stats, named.memstats?
Could you let me know how can I do?
Thank you!!!

In named.conf

options 
        directory "/user/named";
        multiple-cnames yes;
        dump-file       "/var/adm/syslog/named_dump.db";
        memstatistics-file      "/var/adm/syslog/named.memstats";
        statistics-file "/var/adm/syslog/named.stats",


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