named is creating excessive number of tmp-xxxxx files.

[Marc Chamberlin]

Hello, I am running a named service on  the OpenSuSE 15.4 platform.

> # named -v
> BIND 9.16.44 (Extended Support Version) <id:cd2b460>

and I am getting an excessive number of binary tmp-xxxxxx files created 
in the named chroot directory - /var/lib/named.  (xxxxxx is just a bunch 
of random characters.) What are these files and how to I automatically 
manage the creation and deletion of them? Could I simply add an

'ExecStartPre=+/bin/rm -rf /var/lib/named/tmp-*

to the named.service file in order to delete all these tmp-* files 
whenever the named service is started/restarted or would this be an 
unsafe practice? I don't know if these files are being used to persist 
information across restarts of the named service or not... These tmp 
files contain binary information and as such are unreadable.

Much appreciate, and thanks in advance for some advice...    Marc C


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