[Oracle]-[EM]-solution where EM cannot be opened

[Oracle]-[EM]-solve the problem that EM cannot be opened for a long time and it has not been opened yet. This error occurs today: SQL> select username, account_status from dba_users; USERNAME ACCOUNT_STATUS extends outln opensys opensystem OPENMY_USER openbisal openscott opentest opendbsnmp expired & unlock EXPIRED & lockeddip expired & LOCKED it is said that DBSNMP and SYSMAN users are used for EM, but SYSMAN does not have it here? Decided to recreate an EM Database: [oracle @ liu Desktop] $ emca-config dbcontrol db-repos create... again: SQL> select username, account_status from region; USERNAME ACCOUNT_STATUS when using OUTLN using OPENSYS OPENSYSTEM OPENDBSNMP OPENSYSMAN OPENMY_USER OPENBISAL OPENSCOTT OPENTEST using EXPIRED & LOCKEDDIP EXPIRED & LOCKED DBSNMP and SYSMAN are available, and the status is OPEN.. In this case, EM can be enabled normally.