Internal structure

• It writes all the nagios statistics like host state changes, service state changes, schedule downtimes, comments and so on in the database opmon.
• All performance data is written to the datadase opperf and each host has a dynamic created table in the format: perf_ where host_id comes from the opcfg database. This strategy was tought to easy administration, increase query speed and update, instead of having a huge table, we split them in hosts.
• In the opperf database there is a table service_metric that contains all the metrics a host and service have.