Out of Memory and BIND-9.2.1

[arinahofmann at netscape.net]

Hi,

I just have installed bind-9.2.1 as secondary and wanted to test it with 1 very large zone file (15 Mio. lines). It needs approx. 1.2 GB Memory.

When doing a Zonetransfer from the primary the transfer stops at 2 GB memory with the following message:
Jun 02 09:50:06.314 xfer-in: error: transfer of 'arina-test.com/IN' from 10.11.1.20#53: failed while receiving responses: out of memory
Jun 02 09:50:06.315 xfer-in: info: transfer of 'arina-test.com/IN' from 10.11.1.20#53: end of transfer

The server has 4 GB:
Memory: 4096M real, 1534M free, 2167M swap in use, 6167M swap free

In named.conf I already have set:
options {
       datasize                4g;

Does anybody know is bind-9.2.1 is limited to 2GB memory, is it a bug or feature? Does anybody has an idea to solve that problem?

Thanks
Arina