Database Tuning (MOSC)

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Preventing Login Storm

edited Oct 31, 2013 8:27PM in Database Tuning (MOSC) 7 commentsAnswered
 Hi,   
 we had a sudden performance degradation in the database for which i was informed that this application suffers from sudden increase of logins (or a storm of logins) and also sometimes with so many inactive session.

My questions are,

1.why such login storm happens and is there any way we can identify or point out this issue
(storm of logins) in oracle and what is the fix for it?

2.how to measure time taken for session to connect the database?

This insert statement i found through grid  which has multiple plan  hash values and there were about 60 session at the start and 158  session running at the peak  period involved in enq tx index contention & row lock contention and logfile sync causing some session contention and ultimately making the database to hang

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