Check manual page of oracle_sessions
Number of active sessions in ORACLE database
This check monitors the number of active sessions in an
ORACLE database. You can set warn/crit levels.
This check needs the Check_MK mk_oracle-plugin installed in
the agent. Please refer to the online documentation
for how to install that plugin.
The SID of the database (as appearing in the process
name of the pmon_... process).
One separate check for each database found running will