NUMBER OF LIBRARY OBJECT LOCKS OF QUEUE INCREASE AFTER EACH DEQUEUE IN 12.1.0.2 (Doc ID 2194916.1)

Last updated on MAY 23, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.1 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.

Symptoms

After the database was upgraded to 12.1.0.2 it is observed that the number of library objects locks on a session increases after the execution of a dequeue call. When there is a large number of concurrent users dequeueing from the
queue this eventually can leads to ORA-4025 errors being reported:

ORA-04025: maximum allowed library object lock allocated for SYS.KSUN_QUEUE
ORA-06512: at "SYS.TEST_DEQ", line 40
ORA-06512: at line 1

 

Other possible symptom:

ORA-04031: unable to allocate 3272 bytes of shared memory ("streams pool","unknown object","streams pool","sob_kgqmrec")

 

Changes

 Database upgrade from 11g to 12c

Cause

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