SQL> SELECT KTUXEUSN, KTUXESLT, KTUXESQN, /* Transaction ID */   
  2  KTUXESTA Status,    KTUXECFL Flags ,KTUXESIZ 
  3  FROM x$ktuxe
  4  WHERE ktuxesta!='INACTIVE';


  KTUXEUSN   KTUXESLT   KTUXESQN STATUS           FLAGS                      KTUXESIZ
---------- ---------- ---------- ---------------- ------------------------ ----------
        13          5      47447 ACTIVE           DEAD                        2819919
        39          0        502 ACTIVE           NONE                              1
        43         45        480 ACTIVE           NONE                              0
    

      SQL> /


  KTUXEUSN   KTUXESLT   KTUXESQN STATUS           FLAGS                      KTUXESIZ
---------- ---------- ---------- ---------------- ------------------------ ----------
        13          5      47447 ACTIVE           DEAD                        2819919<----該值沒減小。
        39          0        502 ACTIVE           NONE                              1
        43         45        480 ACTIVE           NONE                              0
    

查詢v$px_session和v$fast_start_servers,顯示非常多并行進(jìn)程在rollback，依據(jù)以往的project經(jīng)驗：

于是改為

      SQL>alter system set fast_start_parallel_rollback=false scope=both;
    

之后，再次執(zhí)行

      SQL> SELECT KTUXEUSN, KTUXESLT, KTUXESQN,/* Transaction ID */  
 2  KTUXESTA Status,    KTUXECFL Flags ,KTUXESIZ
 3  FROM x$ktuxe
 4  WHERE ktuxesta!='INACTIVE';
 KTUXEUSN   KTUXESLT   KTUXESQN STATUS           FLAGS                      KTUXESIZ
---------- ---------- -------------------------- ------------------------ ----------
       13          5      47447 ACTIVE           DEAD                        2033516
       35         29        502 ACTIVE           NONE                              1
 
SQL> /
 
 KTUXEUSN   KTUXESLT   KTUXESQN STATUS           FLAGS                      KTUXESIZ
---------- ---------- -------------------------- ------------------------ ----------
       13          5      47447 ACTIVE           DEAD                        2033433<---該值不斷變小。
       35         29        502 ACTIVE           NONE                              1
    

使用例如以下腳本查看回滾完成的估計時間（以天為單位）：

      SQL> set serveroutput on
SQL> declare
 2   l_start number;
 3   l_end number;
 4   begin
 5   select ktuxesiz into l_startfrom x$ktuxe where KTUXEUSN=13 and KTUXESLT=5;
 6   dbms_lock.sleep(60);
 7   select ktuxesiz into l_endfrom x$ktuxe where KTUXEUSN=13 and KTUXESLT=5;
 8   dbms_output.put_line('time estDay:'|| round(l_end/(l_start -l_end)/60/24,2));
  9   end;
 10   /
time est Day:.21
    

?24*0.21=5.04小時。即：估計5.04小時后回滾完成。

另外注意：在其它環(huán)境使用時，請注意替換KTUXEUSN=13和KTUXESLT=5