Memory Reduction

[Frank]

Hallo

please how can i reduce the Memory allocation of a Bind 9.21
caching-only Server reducing ?

25459 named     15   0 37548  36M  1908 S     0,0 14,6   0:00 named
25460 named     15   0 37548  36M  1908 S     0,0 14,6   0:51 named
25461 named     15   0 37548  36M  1908 S     0,0 14,6   0:00 named
25462 named     15   0 37548  36M  1908 S     0,0 14,6   0:00 named
25457 named     16   0 37548  36M  1908 S     0,0 14,6   0:00 named

restarted, about 2 minutes. most it has much more memory in use.

acl "corpnets" { 192.168.0.12; 192.168.0.1; 127.0.0.1; };
options {
        directory "/var/named/";
        allow-query { "corpnets"; };
        recursion yes;
        allow-recursion {192.168.0.12; 192.168.0.1; 127.0.0.1; };
        listen-on {192.168.0.12; 127.0.0.1; };
        listen-on-v6 { none; };
        minimal-responses yes;
        auth-nxdomain no;
        notify no;
        coresize 5M;
        datasize 5M;
        stacksize 5M;
        heartbeat-interval 0;
        interface-interval 0;
        lame-ttl 1800;
        max-ncache-ttl 86400;
        forward only;
        forwarders {
        194.25.2.131;
        145.253.2.11;
        };
};

logging {
        category "lame-servers" { "null"; };
        category "general" { "null"; };
      # channel channel_name {
      #        file "/var/named/debug.log";
      #        print-time yes;
      #        print-category yes;
      #                      };
      # category queries { channel_name; };
        };