Real-Time User Monitoring
Many times customer asked me to know how many users are active in a specific moment.
The usual approach is based on monitoring active web session number.
Unfortunately, some Application Server (as JBoss) postpones session deletion respect applicative session invalidation requested in log off operation. Other times, users forgot to execute the log off leaving active their sessions.
In this situation, session number is not much useful.
SpyGlass Tracer adopts a different approach and monitor real requests session ID in a defined time interval and use that information to report user number.
Given a standard 20 minutes session duration, user value reported by SpyGlass Tracer is less that 50%, and sometimes less that 30% of total active session number.tags: Performance Tuning J2EE optimization Web User Analysis