RESETTING THE LOST ORACLE DBA PASSWORD

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Oracle - Recover lost passwords
It is important to recover your lost password on the Oracle database as not having it
would hamper your productivity and access to the database, resulting in security issues.
The previous DBA programming instance before closing the database, try to reset the
Oracle home database password, remove it permanently and then manually instruct
and run the Oracle password utility. After the code runs successfully from the command
prompt and the new system password is generated, log in to the Oracle Database
System and change or create a new password. The recovery process works well when
you refer to the administrators guide for Oracle 9i.

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First, To recover a password in Oracle, simply connect under command line
mode on the server:
#sqlplus /nolog
SQL>conn / as sysdba
SQL>alter user Username identified by PASSWORD;

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To reset your Orable database password:
Your password file should be under <orahome>databasePWD<SID>.ora.
Delete it and run the Oracle password utility from the command prompt:
c:Oracleora92database>ORAPWD file=PWD<SID>.ora
password={password} entries={however many}.
The <password> is your new sys password. After you log in as sys you can
change it and create new passwords for system. ou must connect to the server
under command line mode to recover the Oracle System DBA password.