NUMBER OF LIBRARY OBJECT LOCKS OF QUEUE INCREASE AFTER EACH DEQUEUE IN 22.214.171.124
(Doc ID 2194916.1)
Last updated on FEBRUARY 13, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
After the database was upgraded to 184.108.40.206 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.TEST_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")
Database upgrade from 11g to 12c
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