How to find which user is blocking user?

I am trying to learn what user blocks which user?

According to the view v$ session, if BLOCKING_SESSION is not null. This means the current session block BLOCKING_SESSION?

v$ lock view is also the SID column display the SID blocker or blocked SID?

I want to see who is blocking user.

By the way the modes performance do you recommend in order to know these things? I see that serves as V$ SESSION_BLOCKERS.

Thank you

When analyzing Oracle locks, some of the views of database keys, you must consider are the V$ LOCK and

the views V$ SESSION. The V$ LOCKED_OBJECT and the views DBA_OBJECTS are also very useful to identify

locked objects.

I recommend reading the book of database Oracle 11 g Performance Tuning recipes at least on your beginning. You will find queries like this:

Select s1.username. '@' || S1.machine

|| ' (SID =' | s1.sid | block him ') '

|| S2. UserName | '@' || S2.machine | ' (SID =' | s2.sid |) ') ' AS blocking_status

GV $ lock l1, gv$ session s1, gv$ lock l2, gv$ session s2

where s1.sid = l1.sid and s2.sid = l2.sid

and l1. BLOCK = 1 and l2.request > 0

and l1.id1 = l2.id1

and l2.id2 = l2.id2;

Tags: Database

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