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In this post, I am going to show you how to reconfigure the DB Console master node to a new existing node in the cluster. This is a 3 node Real Application Clusters environment. We are using Enterprise manager db console 11g to monitor the 3 nodes RAC as opposed to Oracle Enterprise Manager grid control or EM cloud Control.
First of all, you need to check the actual configuration; the following output is showing ca25db01 is the actual master enterprise manager node, and only the Enterprise manager agent is running on the remaining nodes; ca25db02 and ca25db03.
[oracle@ca25db01 ~]$ emca -displayConfig dbcontrol –cluster
STARTED EMCA at Nov 9, 2011 12:57:53 AM
EM Configuration Assistant, Version 184.108.40.206.2 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Enter the following information:
Database unique name: cmsdb
Service name: cmsdb.oracle-class.com
Do you wish to continue? [yes(Y)/no(N)]: tes
Do you wish to continue? [yes(Y)/no(N)]: Y
Nov 9, 2011 12:58:14 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /opt/app/oracle/cfgtoollogs/emca/cmsdb/e mca_2011_11_09_00_57_53.log.
Nov 9, 2011 12:58:17 AM oracle.sysman.emcp.EMDBPostConfig showClusterDBCAgentMes sage
**************** Current Configuration ****************
INSTANCE NODE DBCONTROL_UPLOAD_HOST
---------- ---------- ---------------------
cmsdb ca25db01 ca25db01.oracle-class.com
cmsdb ca25db02 ca25db01.oracle-class.com
cmsdb ca25db03 ca25db01.oracle-class.com
Enterprise Manager configuration completed successfully
FINISHED EMCA at Nov 9, 2011 12:58:17 AM
read the complete article here: http://www.oracle-class.com