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I have installed Oracle databases 18c. I forgot the account administrator of the databases, how to recover the password?

SP2-0640: Not connected
SQL> conn XEPDB1
Enter password:
ERROR:
ORA-01017: invalid username/password; logon denied
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1 Answer 1

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Make a connection using OS authentication and change whatever is needed. For this it is in most cases needed to logon to the database server with an account that is a member of the dba group (or whatever group was specified during the installation).

Set your ORACLE_SID, ORACLE_HOME en PATH variables correctly and connect using

sqlplus / as sysdba

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