How to know username and password of Oracle 10g Ex? [duplicate] - oracle10g

Question

This question already has answers here:
Forgot Oracle username and password, how to retrieve?
(5 answers)
Closed 6 years ago.
Actually, I forgot my username and password of Oracle 10g Ex. Are there any way to find them?

Answer 1

Log into the database server as a user belonging to ‘dba’ [unix ] or ‘ora_dba’ [windows ] group , typically ‘oracle’, or an administrator on your windows machine. Then you will be able to log in to Oracle as SYS user, and change the SYSTEM password by doing the following
$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.1.0 - Production on Mon Apr 5 15:32:09 2004
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> show user
USER is "SYS"
SQL> passw system
Changing password for system
New password:
Retype new password:
Password changed
SQL> quit
Next, we need to change the password of SYS:
$ sqlplus "/ as system"
SQL*Plus: Release 9.2.0.1.0 - Production on Mon Apr 5 15:36:45 2004
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
SP2-0306: Invalid option.
Usage: CONN[ECT] [logon] [AS {SYSDBA|SYSOPER}]
where <logon> ::= <username>[/<password>][#<connect_string>] | /
Enter user-name: system
Enter password:
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> passw sys
Changing password for sys
New password:
Retype new password:
Password changed
SQL> quit
You should now be able to log on the SYS and SYSTEM users, with the passwords you just typed in.