Services are useful, especially for tracing

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(Picture by Shane Hauser, via Unsplash)

A fellow developer recently asked me if I could help him check if a bug had been fixed in production or not, because he could not trace (pun intented) recent changes. The problem consisted in 2 specific queries launched a gazillion times on an Oracle 12.1 database. Among other things, I wanted to get some traces, so I asked questions to better understand and narrow down what should be traced.
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