Hang Due To Library Cache Lock in DBMS_AQ.ENQUEUE For Non Existing Queue Table (Doc ID 2533298.1)

Last updated on JANUARY 15, 2020

Applies to:

Symptoms

PLSQL procedure indefinitely hangs in dbms_aqadm.create_queue with wait event 'library cache pin' when enqueue done for a non existent queue.


The steps followed in the plsql procedure are :
1. dbms_aq.enqueue(queue_name ....  --> non existing queue
2. dbms_aqadm.create_queue_table( ... -->
3. dbms_aqadm.create_queue(queue_name ....  -> with same queue name as no.1


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Problem is in dbms_aq.enqueue() does not release lock even the queue is not exist.

Changes

Cause

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