OS & Oracle

What is it?
OMonitor is motivated by the real-time system monitor, such as Windows Tasks Manager, Linux top command.
It provides and will provide the real-time monitoring and analysis to the current running Oracle Database.
Graph visualization and table analysis are the fundamental of OMonitor, it will be easy to use,
easy to discover problem and easy to analyze [...]

1. Introduce
The ASH(Active Session History) is the innovative improvement in 10g.
ASH records the activities of Oracle, sampling per second, if a session is using on CPU or waiting on resource, such as db file sequential read, log file sync, latch etc, then this session is considered to be active, and recorded down in the v$active_session_history [...]