Happy New Year everyone!
Following a recommendation from the dCache developers, I set up some PostGreSQL monitoring using pgFouine. It is very simple to install and configure. The plots are generated automatically by the pgfouine tool in addition to giving a full breakdown of what queries took the longest time. This should be useful to let you understand what your database (and hence dCache) is doing. You can also use it to analyse the output of the VACUUM (FULL) ANALYSE command which should give you an idea as to how large the FSM should be set to (which is an important configuration parameter).
PS Fouine is French for stone marten, which is something like a weasel.
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