split DNS?

[Sky Me]

2007/5/25, Kevin Darcy <kcd at daimlerchrysler.com>:
> Yes. Check out doc/arm/Bv9ARM.ch06.html#view_statement_grammar relative
> to the top-level of the BIND distribution.
>

After reading Bind's "view" content,I thought there're a little problems.
For example,say we have two services in isp a:

foo.example.com  A  11.11.11.11    # service for isp a only
bar.example.com  A  22.22.22.22    # service for both isp a and b

and have only one service in isp b:

foo.example.com A  33.33.33.33    # service for isp b only

The view config may looks below:

view "ispa" {
      match-clients { "acl-ispa"; };
      zone "example.com" {
            type master;
            file "example-ispa.db";
      };
};
view "ispb" {
      match-clients { "acl-ispb"; };
      zone "example.com" {
            type master;
            file "example-ispb.db";
      };
};
view "other" { # say they get same answers as isp a
      match-clients { any; };
      zone "example.com" {
            type master;
            file "example-ipsa.db";
      };
};


Then we need 2 database files,and most items are may the same.like:

example-ispa.db:
foo.example.com  A  11.11.11.11
bar.example.com  A  22.22.22.22

example-ispb.db:
foo.example.com  A  33.33.33.33
bar.example.com  A  22.22.22.22

So the difficulty I first think is that we have to maintain two database files.
When db files are large enough,this work may become hard.Am I right?