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blocking session info belatedly displayed from (g)v$session (Doc ID 2778416.1)

Last updated on JUNE 01, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

Symptoms

On : 12.2.0.1 version, RDBMS

ACTUAL BEHAVIOR
---------------
From (g)v$session view the blocking session information does not appear immediately and there is a delay for a certain period of time. The information is displayed after about 10 seconds from actual session waiting occurrence.


SYSDATE EVENT WAIT_TIME_MICRO/1000000 BLOCKING_INSTANCE BLOCKING_SESSION STATE
20210506 16:40:17 enq: TX - row lock contention .269874 WAITING
20210506 16:40:18 enq: TX - row lock contention 1.337202 WAITING
20210506 16:40:19 enq: TX - row lock contention 2.435408 WAITING
   ......

20210506 16:40:26 enq: TX - row lock contention 8.981453 WAITING
20210506 16:40:27 enq: TX - row lock contention 10.091895 1 29 WAITING    <<---! in about 10 seconds, blocking instance=1, blocking sessoin=29 displayed.
20210506 16:40:28 enq: TX - row lock contention 11.16133 1 29 WAITING


Cause

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In this Document
Symptoms
Cause
Solution
References


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