不解释，看结果：
SQL> SET serveroutput ON
SQL> ;
SQL> BEGIN
2 dbms_output.enable();
3 dbms_output.put_line('HELLO');
4 END
5 ;
6 /
HELLO
PL/SQL procedure successfully completed
SQL> SET serveroutput ON
SQL> ;
SQL> BEGIN
2 dbms_output.disable();
3 dbms_output.put_line('HELLO');
4 END
5 ;
6 /
PL/SQL procedure successfully completed
SQL> SET serveroutput OFF
SQL> ;
SQL> BEGIN
2 dbms_output.enable();
3 dbms_output.put_line('HELLO');
4 END
5 ;
6 /
PL/SQL procedure successfully completed
SQL> SET serveroutput OFF
SQL> ;
SQL> BEGIN
2 dbms_output.disable();
3 dbms_output.put_line('HELLO');
4 END
5 ;
6 /
PL/SQL procedure successfully completed
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