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Drop Materialized View Hangs with 'Enq: JI - Contention' (Doc ID 1126123.1)

Last updated on NOVEMBER 07, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.4 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and data used represents fictitious data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product.  Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.

When running a DROP MATERIALIZED VIEW the session hangs.

The hang has been reproduced and this time we have some trace files generated:

Connect to any session and run the following commands:


This wait event was determined to be due to a DBMS_JOB entry to refresh the mview we are trying to drop.  So after removing this job we could then successfully drop the mview.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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