DB Time : Total Response time – Idle wait time.Response Time : Service Time + Wait Time.Wait Event : A named label describing the reason for the wait by a session / process.V$session/v$session_wait, v$session_event – When a session waits it posts the purpose of its wait with a wait event and can be viewed from Wait Time : Time spent waiting for a resource to be freed in effect waiting for another.– Throughput may also be viewed as the total response time of all Throughput : Total work done in an interval of time.Response Time : Time taken for a task (query) to complete.Isolate database as the cause of the problem.Measure CPU and Memory usage at the OS level.Look for repeated memory, space(Undo/Temp), contentionĪnd network related Oracle errors (It does not hurt to check.ASK relevant questions to all related stake holders.Or more sessions to release resources, generally a locking Hang – Large number of sessions/processes waiting for one.Spin – High CPU usage by few oracle processes/sessions.Slow – Overall DB performance is slower than usual.A badly written SQL doing excessive disk access and using CPU cycles,.– The System/Database is made to do more work than it actually can – Too many sessions waiting for a lock, CPU or any other resource.
– Users not being able to connect to database – Users facing slowness of application UI Timely manner we say there is a performance problem. When one or more database tasks do not complete in a.Minimize contention, enabling the largest possible workload Optimization of resource use to increase throughput and Database performance tuning can be defined as the.– Workload : Total Work submitted to the system – Throughput : Rate of doing work/ Processing Accepted Throughput for a given Workload.Disclaimer : The content here is completely based on my knowledge and experience and may not be completely accurate.
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