Can you use untrusted languages for important functions?
Absolutely! Sometimes, it may be the only way to accomplish some tasks from inside the server. Performing simple queries and computations should do nothing harmful to your database, and neither should connecting to the external world for sending e-mails, fetching web pages, or performing SOAP requests. However, be careful about performing operations that may cause delays and even queries that get stuck, but these can usually be dealt with by setting an upper limit as to how long a query can run, by using an appropriate statement time-out value. Setting a reasonable statement time-out value by default is a good practice anyway.
So, if you don't deliberately do risky things, the probability ...
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