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This howto is unusable for todays needs

Sorry, using check_tcp for database monitoring??? Maybe this was state of the art in the 90’s.
And even more weird…java-plugins. Did the author ever see an installation with more than 1 database? Imagine you have hundreds of databases to monitor or a few sap databases with 200 tablespaces each. Can you even imagine what happens if you fire up a java-plugin for every tablespace in 5-minute intervals?
And what about reading the nagios plugin devloper guidelines? performance data? command line arguments?
If you want to monitor databases seriously then check_oracle_health and it’s cousins are the way to go.