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3.SQL> connect /as sysdba
¡¡¡¡¡¡ Connected.
4.SQL> alter user system account unlock;
¡¡¡¡¡¡ User altered.
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1.SQL> alter user system account lock;
¡¡¡¡¡¡ User altered.
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1.SQL> alter user system identified by tiger;
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