Oracle忘记数据库密码

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windows：

echo %ORACLE_SID%   
set ORACLE_SID=orcl
sqlplus / as sysdba
alter user you_username identified by you_password;
alter user you_username account unlock;

linux：

echo $ORACLE_SID
set ORACLE_SID=orcl
sqlplus / as sysdba
alter user you_username identified by you_password;
alter user you_username account unlock;