How to Install Oracle Enterprise Manager Cloud Control 12cR5 in Red Hat Linux Step by step

Oracle cloud control

Oracle Enterprise Manager 12c R5 ( Cloud Control Installation, Configuration and Management

Oracle Database 12CR2 Standalone in Red Hat Linux Step by step Database installation is made by adhering to the document.

We install the packages required for Oracle Enterprise Manager 12c Cloud Control Installation to our operating system.

yum install make-3*
yum install binutils-2*
yum install gcc-4*
yum install libaio-0*
yum install glibc-common-2*
yum install libstdc++-4*
yum install sysstat-*
yum install glibc-devel

  • When you uninstall the “Enterprise Manager” installation option in Oracle 12cR2 installation, you will not need to do this.
  • In our database, we remove the “Enterprise Manager” repository and software if installed, with the following command. If we do not run this command, we may get an error during installation.

First of all, we stop our Enterprise Manager console if it is running.

emctl stop dbconsole

We are removing the Enterprise Manager repository

$emca -deconfig dbcontrol db -repos drop -SYS_PWD -SYSMAN_PWD
STARTED EMCA at Apr 2, 2019 2:39:01 AM
EM Configuration Assistant, Version Production
Copyright (c) 2003, 2011, Oracle. All rights reserved.

Enter the following information:
Database SID: orcl
Listener port number: 1521

WARNING : While repository is dropped the database will be put in quiesce mode.

Do you wish to continue? [yes(Y)/no(N)]: y
Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at
Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.util.GeneralUtil initSQLEngineLoacly
WARNING: ORA-28000: the account is locked

Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.ParamsManager
WARNING: Error initializing SQL connection. SQL operations cannot be performed
Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.EMDBPreConfig performDeconfiguration
WARNING: EM is not configured for this database.
No EM-specific actions can be performed. Some of the possible reasons may be:
1) EM is configured with different hostname then physical host.
Set environment variable ORACLE_HOSTNAME= and re-run EMCA script
2) ORACLE_HOSTNAME is set. Unset it and re-run EMCA script
Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) …
Apr 2, 2019 4:51:25 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Enterprise Manager configuration completed successfully
FINISHED EMCA at Apr 2, 2019 4:51:25 AM

  • When setting up the database, we should be careful about arranging the required parameters for “Oracle Enterprise Manager 12c Cloud Control” as follows. If our database parameters are higher than the following values, we do not need to make any changes. It can stay as it is. The values given below are those that should be minimum.
  • Our database must contain 3 “Redo Log” files with a size of at least 300MB.
  • Also “Undo” tablespace “AutoExtend” must be set and must have a minimum size of 200MB.

$ sqlplus / as sysdba

alter system set processes=300 scope=spfile;
alter system set session_cached_cursors=200 scope=spfile;
alter system set sga_target=2g scope=spfile;
alter system set shared_pool_size=600m scope=spfile;
alter system set pga_aggregate_target=1g scope=spfile;
alter system set job_queue_processes=20 scope=spfile;
alter system set log_buffer=10485760 scope=spfile;
alter system set open_cursors=300 scope=spfile;


  • After these operations, we restart our database.

shutdown immediate;

  • We create directories where we will install Oracle Enterprise Manager 12c Cloud Control

We do the following operations with the “oracle” user.

mkdir -p /u01/app/oracle/oms12cr5
mkdir -p /u01/app/oracle/agent12cr5

chown -R oracle:oinstall /u01/app/oracle/agent12cr5/
chown -R oracle:oinstall /u01/app/oracle/oms12cr5/

We are creating our directory to be able to put the downloaded installation files.

mkdir -p /u01/orainstall/em12cr5

The installation files are copied here and unzipped.

cd /u01/orainstall/em12cr5

chmod 775 *


rm -fr em12105_linux64_disk*

Then we start the installation process from Gui.

We open terminal and drop our installation directory ” / u01 / orainstall / em12cr5″. Then we open the setup screen by doing “./runInstaller”.

The login screen is available from a web browser using the URL provided in the last screen (“https://em12cr5.localdomain:7802/em”). Log in with the username “sysman” and the password you specified during your installation.

Congrats, Have a nice day.