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I was installing the Oracle 11g Standard Edition by using below URL :

http://dbaora.com/install-oracle-11g-release-2-11-2-on-centos-linux-7/

After installation is completed all is good I can able to access my DB Console by using my username/password with http://tsm.aitc.local:1158/em URL.

But when I reboot my Server(CentOS 7) and run below command

lsnrctl start LISTENER
emctl start dbconsole

Then try to hit below URL

http://tsm.aitc.local:1158/em

Then I am getting below error message on DB Console.

enter image description here

I am using CentOS 7 and Oracle 11g.

user3441151
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  • Did you try to start database instance using SQL*PLUS? Try to access the EM after starting database instance. – atokpas Apr 18 '17 at 14:50
  • @JSapkota Can you please guide me for the command to start database instance by using SQL*PLUS? – user3441151 Apr 18 '17 at 15:02
  • General way is `[oracle@host ]$ sqlplus / as sysdba` then `SQL>startup`, I assume that you have set `ORACLE_SID` and `ORACLE_HOME` environment variables. – atokpas Apr 18 '17 at 15:05
  • @JSapkota I try `[oracle@tsm ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Tue Apr 18 20:33:33 2017 Copyright (c) 1982, 2009, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORACLE instance started. Total System Global Area 1586708480 bytes Fixed Size 2213736 bytes Variable Size 973080728 bytes Database Buffers 603979776 bytes Redo Buffers 7434240 bytes Database mounted. Database opened. SQL> exit` Then `emctl start dbconsole` but same issue. – user3441151 Apr 18 '17 at 15:12
  • What's the output of `[oracle@host ]$ lsnrctl status listener`? Is your listener providing service for the ORA11G SID? – atokpas Apr 18 '17 at 15:19
  • @JSapkota I reboot my server then Login as user "oracle" then run `sqlplus / as sysdba` then `SQL> startup` after that my database instance started. Exit from sqlplus then run `lsnrctl start LISTENER` then run `emctl start dbconsole` and My DB Console run successfully without any error. All is good. But after 15 to 20 Minutes I am not able to access my DB Console again? – user3441151 Apr 19 '17 at 07:03
  • @JSapkota After 15 to 20 Minutes I am not able to access Oracle Enterprise Manager then I just run `ps -ef | grep agent` and kill `emagent` pid. After that run `lsnrctl start LISTENER` then `emctl start dbconsole` and then again everything is ok. Again I am able to access Enterprise Manager perfectly. But I don't know why this behaving like this? – user3441151 Apr 19 '17 at 08:29

1 Answers1

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Check configuration of $ORACLE_HOME/$INSTANCE/sysman/config/emoms.properties

Review things started with oracle.sysman.eml.mntr.*

Dharman
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silhano
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