AWR Snapshots Are Not Being Created Because MMON Is Not Being Respawned (Doc ID 2023652.1) To BottomTo Bottom

APPLIES TO:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.
SYMPTOMS

Due to other reasons, the MMON process died and subsequent AWR reports are therefore not getting generated.

The MMON process should automatically be respawned but it is not.

CAUSE

MMON/MMNL not being respawned or recreated is due to:

unpublished bug: Bug 19565533 - MMON/MMNL CAN NOT BE AUTOMATICALLY RESTARTED AFTER KILLED

The issue only occurs on 11.2.0.4 and is a regression of the fix for Bug 14213856

SOLUTION

To solve the issue:

Apply interim patch 19565533 for 11.2.0.4, if available for your platform.

To check for conflicting patches, please use the MOS Patch Planner Tool
Please refer to
Note 1317012.1 - How To Use MOS Patch Planner To Check And Request The Conflict Patches?

If no patch exists for your version, please contact Oracle Support for a backport request.

- OR -

As a workaround, you can respawn the MMON process by next methods:

Restart the database instance

- OR -

Set the instance to "restricted session" mode and then bring it back to normal mode using following commands as SYSDBA:
  
alter system enable restricted session;
alter system disable restricted session;

這個如果不是dba的使用者會限制登入，dba的賬戶則可以
[

[email protected] ~]$ sqlplus clspuser/clsp

SQL*Plus: Release 11.2.0.3.0 Production on Fri Jan 19 23:29:09 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

ERROR:
ORA-01035: ORACLE only available to users with RESTRICTED SESSION privilege

Enter user-name: clspuser
[[email protected] ~]$
SQL> create user eviswang identified by evis;

User created.

SQL> gant dba to eviswang;
SP2-0734: unknown command beginning "gant dba t..." - rest of line ignored.
SQL> grant dba to eviswang;

Grant succeeded.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
[

[email protected] ~]$ sqlplus eviswang

SQL*Plus: Release 11.2.0.3.0 Production on Fri Jan 19 23:30:31 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Enter password: 

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> 

alter system disable restricted session;後都可以登入

[[email protected] ~]$ sqlplus clspuser/clsp

SQL*Plus: Release 11.2.0.3.0 Production on Fri Jan 19 23:31:15 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> 

alter跟蹤如下：

Fri Jan 19 23:31:41 2018
Stopping background process MMNL
Stopping background process MMON
Starting background process MMON
Fri Jan 19 23:31:43 2018
MMON started with pid=216, OS id=54742 
Starting background process MMNL
Fri Jan 19 23:31:43 2018
MMNL started with pid=219, OS id=54744 
ALTER SYSTEM enable restricted session;
Fri Jan 19 23:32:02 2018
ALTER SYSTEM disable restricted session;
[[email protected] trace]$