1. Change password in the Repository Database

Log in to the repository database as sysdba:

sqlplus / as sysdba

Connect to the SYSMAN user and change the password:

ALTER USER sysman IDENTIFIED BY "<new_password>";

2. Update password in OMS Configuration

After changing in the database, you must update OMS so it can connect.

Go to the OMS host and set the environment:

export ORACLE_HOME=/u01/app/oracle/middleware
export OMS_HOME=$ORACLE_HOME/oms

Run the emctl command to update the SYSMAN password:

$OMS_HOME/bin/emctl config oms -change_repos_pwd -repos_user sysman -repos_pwd <new_password>

3. Restart OMS

$OMS_HOME/bin/emctl stop oms -all
$OMS_HOME/bin/emctl start oms

4. Check the status of OMS

$OMS_HOME/bin/emctl status oms -details