Go to oracle admin login page via official link below
Login using your username and password. Login screen appears upon successful login
If you still can't access oracle admin login then see Troublshooting options or contact us for help.
admin is the default Oracle Application Express administrator account. To create additional Oracle Application Express administrator accounts see "Creating New User Accounts" In Password enter the Oracle Application Express administrator account password you specified when you installed Oracle Application Express.
Log on to the database server with an account that is a member of the OS 'dba' group ('ora_dba' on Windows). This will be the OS account used to install Oracle. Then you should be able to 'sqlplus / as sysdba'. That will connect you as 'sys' using OS authentication.
To connect to Oracle as a privileged user over a non-secure connection you must be authenticated by a password file. When using password file authentication the database uses a password file to keep track of database usernames that have been granted the SYSDBA or SYSOPER system privilege.
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Enter password: ERROR: ORA-01017: invalid username/password; logon denied Enter user-name: student Enter password: Last Successful login time: Fri Aug 10 2018 23:57:35 -04:00 Connected to: Oracle Database 12c Enterprise Edition Release 22.214.171.124.0 - 64bit Production With the Partitioning OLAP Advanced Analytics and Real Application Testing ...
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Open the Database Home Page login window: On Windows from the Start menu select Programs (or All Programs) then Oracle Database 10g Express Edition and then Go To Database Home Page. On Linux click the Application menu (on Gnome) or the K menu (on KDE) then point to Oracle Database 10g Express Edition and then Go To Database Home Page.
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First log in to the Oracle Database as a SYS user. Then use ALTER USER statement to unlock the user as follows: ALTER USER username IDENTIFIED BY password ACCOUNT UNLOCK ; Note that if you unlock an account without resetting the password then the password remains expired therefore the IDENTIFIED BY password clause is necessary.