You may want to add the clause
and blocking_session_status = 'VALID'
I’ve seen cases where blocking_session is not null, but the
blocking_session_status != ‘VALID’. I believe that both checks are needed to
avoid giving false positives.
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> On Behalf
Of Eriovaldo Andrietta
Sent: Thursday, August 01, 2019 11:06 AM
To: ORACLE-L <oracle-l@xxxxxxxxxxxxx>
Subject: Blocking_session is blocker or blocked
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Hello,
In the sql below , the blocking_session is the BLOCKED or BLOCKER session ?
Select blocking_session, blocking_instance,wait_class, sid, serial#, inst_id,
seconds_in_wait, program, module, s.LOGON_TIME
From gv$session s
where blocking_session is not NULL
order by blocking_session;
Regards
Eriovaldo
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