RE: Blocking_session is blocker or blocked

From: Matt Adams <>
Date: Thu, 1 Aug 2019 17:07:52 +0000
Message-ID: <>

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: <> On Behalf Of Eriovaldo Andrietta Sent: Thursday, August 01, 2019 11:06 AM To: ORACLE-L <> Subject: Blocking_session is blocker or blocked

CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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;


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Received on Thu Aug 01 2019 - 19:07:52 CEST

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