EM 12c: Enterprise Manager 12c Cloud Control is not Receiving any Alerts from its Agents (Doc ID 1607640.1)

Last updated on AUGUST 03, 2023

Applies to:

Symptoms

No alerts are being generated in the Enterprise Manager 12c Cloud Control console from any agent.

a) From the .../gc_inst/em/EMGC_OMS1/sysman/log/emoms.trc, the following is logged:

SYSMAN.EM_EVENT_BUS is not enabled for dequeue
ORA-06512: at "SYS.DBMS_AQ", line 675
ORA-06512: at "SYS.DBMS_AQ", line 702
ORA-06512: at "SYSMAN.EM_EVENT_BUS", line 2417
ORA-06512: at line 1

b) EMDIAG output shows the following:

verifyREPOSITORY
======================================================================
3. Disabled AQ time monitor

  INST_ID NAME                                               VALUE
---------- -------------------------------------------------- --------------------------------------------------------------------------------
        1 aq_tm_processes                                    0

8001. Event failures in the last 24 hours
-----------------------------------------

OCCUR_DATE           ERROR_CODE ERROR_MSG
-------------------- ---------- ---------------------------------------------------------------------------------------------------
21-NOV-2013 18:09:42     -20304 Unexpected error during: ENQUEUE(M11/2) ORA-25207: enqueue failed, queue SYSMAN.EM_EVENT_BUS is disabled from enqueueing

c) A SQL query on the SYSMAN.EM_EVENT_BUS table confirms the log file message and the EMDIAG output:

SQL> select count(1) from AQ$_EM_EVENT_BUS_TABLE_L where msgid = '00000000000000000000000000000000';

 COUNT(1)
----------
     6772

Changes

Cause

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