begin 
SYS.DBMS_LOGMNR.ADD_LOGFILE('C:\oracle\oradata\jhoracle\REDO01.LOG', sys.dbms_logmnr.New); 
end; 

select min(low_time),  max(high_time), 
      min(low_scn),  max(next_scn) -1 
from V$logmnr_logs; 

begin 
SYS.DBMS_LOGMNR.START_LOGMNR(Options => sys.dbms_logmnr.DICT_FROM_ONLINE_CATALOG); 
end; 

Select 
SCN, 
timestamp, 
sql_redo, 
session# session_num, 
username, 
session_info 
From V$LOGMNR_CONTENTS where sql_redo like '%update%'
Order by 1; 


begin 
SYS.DBMS_LOGMNR.END_LOGMNR(); 
end;

------解决方案--------------------
查询语句贴出来看看，是是否变量造成的？