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sqlplus /nologSQL>conn / as sysdba;connected as sysSQL>做你的操作。如(create user test identified by password);
conn / as sysdbaalter user sys identified by sys;
alter user system identified by system;
alter ...
conn / as sysdba
alter user user_name identity by password;
sqlplus /nolog
conn / as sysdbaalter user sys identified by sys;