Today I could not remember sysman password for database grid control. How carefully may I change sysman password ? Just follow. 1. Stop OMS (go to OMS dir) [oracle@gridrepo bin]$ ./emctl stop oms Oracle Enterprise Manager 11g Release 1 Grid Control Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved. Stopping WebTier... WebTier Successfully Stopped Stopping Oracle Management Server... Oracle Management Server Successfully Stopped Oracle Management Server is Down 2. Config oms password with -change_repos_pwd parameter [oracle@gridrepo bin]$ ./emctl config oms -change_repos_pwd Oracle Enterprise Manager 11g Release 1 Grid Control Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved. -change_in_db option not specified. Password not changed in backend. Enter Repository User's New Password : Updating repository password in Credential Store... Repository password in Credential Store updated successfully. ...