Powerdns子域&；授权

我正在使用PowerDNS权威服务器和pdns mysql后端。 我正在尝试创建一个子域并将外部NS委托给它。 但我找不到一个合适的文件或例子。我只需要为子域创建NS记录

1. existing domain is "example.com"
2. sub-domain that I want to create is "test.example.com"
3. external NS is "ns1.book.com"

and I have created records to mysql like below.

"domains table"
id |name             |master  |last_check | type  |notified_serial | account
----------------------------------------------------------------------------
1  |example.com      |(NULL)  |(NULL)     |MASTER |               0|(NULL) 
2  |test.example.com |(NULL)  |(NULL)     |MASTER |               0|(NULL)

"records table"
id |domain_id |name             |type  |content  
----------------------------------------------------------------------------
1  |         1|example.com      |SOA   |ns1.example.com hostmaster.example.com 10 900 600 86400 3600 
2  |         1|example.com      |NS    |ns1.example.com
3  |         1|example.com      |NS    |ns2.example.com
4  |         1|ns1.example.com  |A     |10.10.10.10
5  |         1|ns2.example.com  |A     |20.20.20.20
6  |         1|test.example.com |NS    |ns1.book.com 

Is there anything I have to do? 

在大多数情况下，当使用MySQL后端时，您很可能希望对区域使用“NATIVE”类型

删除“test.example.com”区域

记录是正确的，可以使用