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TO_DATE¸ñʽ(ÒÔʱ¼ä:2007-11-02   13:45:25ΪÀý)
  
        Year:     
        yy two digits Á½Î»Äê                ÏÔʾֵ:07
        yyy three digits ÈýλÄê                ÏÔʾֵ:007
        yyyy four digits ËÄλÄê                ÏÔʾֵ:2007
           
        Month:     
        mm    number     Á½Î»Ô              ÏÔʾֵ:11
        mon    abbreviated ×Ö·û¼¯±íʾ          ÏÔʾֵ:11ÔÂ,ÈôÊÇÓ¢Îİæ,ÏÔʾnov    
        month spelled out ×Ö·û¼¯±íʾ          ÏÔʾֵ:11ÔÂ,ÈôÊÇÓ¢Îİæ,ÏÔʾnovember
         
        Day:     
        dd    number         µ±Ôµڼ¸Ìì        ÏÔʾֵ:02
        ddd    number         µ±ÄêµÚ¼¸Ìì        ÏÔʾֵ:02
        dy    abbreviated µ±Öܵڼ¸Ìì¼òд    ÏÔʾֵ:ÐÇÆÚÎå,ÈôÊÇÓ¢Îİæ,


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2.select * from dictionary;
describe dba_users;
select * from dba_users;
select name from v$controlfile;
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alter database drop logfile group 3
select archiver from v$instance;
alter tablespace userdata read only;
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SELECT * from v$lock;
SELECT * from v$sqlarea;
SELECT * from v$session;
SELECT * from v$process ;      
SELECT * from v$locked_object;   
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