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以下内容全部转自：http://www.chenjunlu.com/2013/04/how-to-modify-the-password-for-sysman-of-em-12c-cloud-control/

原作者如有意见，本人立即删除！

If the current SYSMAN password is known:

1. Stop all the OMS:

$ cd <OMS_HOME>/bin
$ ./emctl stop oms

Execute the same command on all the OMS machines including the primary OMS machine. Do not include ‘-all‘ as the Admin Server needs to be up during this operation.

2. Modify the SYSMAN password:

$ cd <OMS_HOME>/bin
$ ./emctl config oms -change_repos_pwd

Note:

• The above command will prompt you for the current password of the SYSMAN user and the new password.
• The password will be modified at the Repository Database as well as the WLS Credential store and the monitoring credentials for the ‘OMS and Repository’ target.
• Along with the SYSMAN password, this command will modify the password for the ALL the EM users (SYSMAN_MDS, BIP, SYSMAN_OPSS, SYSMAN_APM, SYSMAN_RO, MGMT_VIEW) created in the Repository Database.

Example output:

$ ./emctl config oms -change_repos_pwd
Oracle Enterprise Manager Cloud Control 12c Release 12.1.0.1.0
Copyright (c) 1996, 2011 Oracle Corporation. All rights reserved.
Enter Repository User’s Current Password :
Enter Repository User’s New Password :

Changing passwords in backend …
Passwords changed in backend successfully.
Updating repository password in Credential Store…
Successfully updated Repository password in Credential Store.
Restart all the OMSs using ‘emctl stop oms -all’ and ‘emctl start oms’.
Successfully changed repository password.

3. Stop the Admin server on the primary OMS machine and re-start all the OMS:

$ cd <OMS_HOME>/bin
$ ./emctl stop oms -all
$ ./emctl start oms

If the current SYSMAN password is unknown:

1. Stop all the OMS:

$ cd <OMS_HOME>/bin
$ ./emctl stop oms

Execute the same command on the primary OMS machine as well. Do not include ‘-all’ as the Admin Server needs to be up during this operation.
If the version of OMS is 12.1.0.1 and password is manually changed at the Database level, apply Patch 13697830 on OMS Home and then run the command below to get the password updated in all configurations.
2. Modify the SYSMAN password:

$ cd <OMS_HOME>/bin
$ ./emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd <sys user password> -new_pwd <new sysman password>

Note:

• The ‘-use_sys_pwd’ is used to connect to the database as a SYS user and modify the sysman password in the Repository database.
• The current sysman password is not prompted for and only the new password needs to be entered. This will allow the reset of the old password to the new password entered.
• The password will be modified at the Repository Database as well as the WLS Credential store and the monitoring credentials for the ‘OMS and Repository’ target.
• Along with the SYSMAN password, this command will modify the password for the ALL the EM users (SYSMAN_MDS, BIP, SYSMAN_OPSS, SYSMAN_APM, SYSMAN_RO, MGMT_VIEW) created in the Repository Database.

Example output:

$ ./emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd oracle123 -new_pwd oracle12
Oracle Enterprise Manager Cloud Control 12c Release 12.1.0.1.0
Copyright (c) 1996, 2011 Oracle Corporation. All rights reserved.

Changing passwords in backend …
Passwords changed in backend successfully.
Updating repository password in Credential Store…
Successfully updated Repository password in Credential Store.
Restart all the OMSs using ‘emctl stop oms -all’ and ‘emctl start oms’.
Successfully changed repository password.

3. Stop the Admin server on the primary OMS machine and re-start all the OMS:

$ cd <OMS_HOME>/bin
$ ./emctl stop oms -all
$ ./emctl start oms