Bind Setup, question

[ssherman]

I have named/Bind setup with dhcp (ddns).

I have noticed that in my /var/named/data/ folder has 1,775 files with the name tmp-Random Characters (tmp-zt5r4UyBgv) is this normal?

Centos 7 3.10.0-514.26.2.el7.x86_64
bind-9.9.4-50

[mghe]

It can be a bug of Bind or wrong configuration.