How to trace MySQL access of NC

In order to figure out, why is my NC V16.0.5 installation denying to delete entries like calender entries, I would like to see whether NC is using DELETE queries at all.

Background:
I installed NC in my WebPack at Hosteurope, which means that I have no or ot reasonable means to use tracing that comes with MySQL.

Question:
How to manipulate which PHP-Files to trace NC activities of MySQL or how to configure NC to trace NC activities?

Thank you for answering the question.

Best regards

Jörg