Alert Log File Message "ERROR: Emon failed to start." And "wait for EMON to spawn" (Doc ID 1361166.1)

Last updated on FEBRUARY 02, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.2 [Release 11.1 to 11.2]
Information in this document applies to any platform.
***Checked for relevance on 26-Feb-2013***

Symptoms

EMON process fails during database start-up. When reviewing alert log file, the following error is seen:

Wed Jul 08 12:53:34 2009
ERROR: Emon failed to start.
Wed Jul 08 12:55:34 2009
ERROR: Emon failed to start.
Wed Jul 08 12:57:34 2009
ERROR: Emon failed to start.
Wed Jul 08 12:59:34 2009
ERROR: Emon failed to start.
Wed Jul  08 13:01:34 2009
ERROR: Emon failed to start.
Wed Jul 08 13:03:34 2009
ERROR: Emon failed to start.


There may be sessions waiting on "wait for EMON to spawn" as well, you can use below query to double check.

select sid, serial#, event from gv$session where upper(event) like upper('%wait for EMON to spawn%');

Changes

Enabled Advanced Queueing Notification System or if already in use, increased the client registered volume.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms