ORACLE数据库SQL优化 not in 与not exits

各个表的数据量：

sys_file_convert_queue 65989
sys_att_file 73061
sys_att_main 84405
sys_att_rtf_data 1507

优化前，执行时间大概2分多钟
SQL> set autotrace traceonly
SQL> delete from sys_file_convert_queue
     where ((fd_file_id is not null or fd_file_id <> '') and
           fd_file_id not in (select fd_id from sys_att_file))
        or fd_attmain_id not in
           (select fd_id
              from sys_att_main
            union all
            select fd_id from sys_att_rtf_data);

 rows deleted.

Execution Plan
----------------------------------------------------------
Plan hash value: 

--------------------------------------------------------------------------------
---------------

| Id  | Operation            | Name                   | Rows  | Bytes | Cost (%C
PU)| Time     |

--------------------------------------------------------------------------------
---------------

|    | DELETE STATEMENT     |                        |  |  9879K|   125K
()| :: |

|    |  DELETE              | SYS_FILE_CONVERT_QUEUE |       |       |
   |          |

|*   |   FILTER             |                        |       |       |
   |          |

|    |    TABLE ACCESS FULL | SYS_FILE_CONVERT_QUEUE |  |  9879K|
()| :: |

|    |    UNION-ALL         |                        |       |       |
   |          |

|*   |     INDEX UNIQUE SCAN| SYS_C0015191           |      |     |
()| :: |

|*   |     INDEX UNIQUE SCAN| SYS_C0015192           |      |     |
()| :: |

|*   |    INDEX FULL SCAN   | SYS_C0014984           |      |     |
()| :: |

--------------------------------------------------------------------------------
---------------

Predicate Information (identified by operation id):
---------------------------------------------------

    - filter( NOT EXISTS ( (SELECT "FD_ID" FROM "SYS_ATT_MAIN" "SYS_ATT_MAIN" W
HERE

              "FD_ID"=:B1) UNION ALL  (SELECT "FD_ID" FROM "SYS_ATT_RTF_DATA" "S
YS_ATT_RTF_DATA"

              WHERE "FD_ID"=:B2)) OR ("FD_FILE_ID" IS NOT NULL OR "FD_FILE_ID"<>
'') AND  NOT EXISTS

              (SELECT  FROM "SYS_ATT_FILE" "SYS_ATT_FILE" WHERE LNNVL("FD_ID"<>
:B3)))

    - access("FD_ID"=:B1)
    - access("FD_ID"=:B1)
    - filter(LNNVL("FD_ID"<>:B1))

Statistics
----------------------------------------------------------
           recursive calls
            db block gets
     consistent gets
          physical reads
          redo size
          bytes sent via SQL*Net to client
         bytes received via SQL*Net from client
            SQL*Net roundtrips to/from client
           sorts (memory)
            sorts (disk)
            rows processed

优化后，执行时间2秒不到
SQL> delete from sys_file_convert_queue a
     where not exists
     (select fd_id from sys_att_file b where a.fd_file_id = b.fd_id)
        or not exists (select
              from (select fd_id
                      from sys_att_main
                    union all
                    select fd_id from sys_att_rtf_data) c
             where a.fd_attmain_id = c.fd_id)
   ;

 rows deleted.

Execution Plan
----------------------------------------------------------
Plan hash value: 

--------------------------------------------------------------------------------
----------------

| Id  | Operation             | Name                   | Rows  | Bytes | Cost (%
CPU)| Time     |

--------------------------------------------------------------------------------
----------------

|    | DELETE STATEMENT      |                        |  |  9879K|
 ()| :: |

|    |  DELETE               | SYS_FILE_CONVERT_QUEUE |       |       |
    |          |

|*   |   FILTER              |                        |       |       |
    |          |

|    |    TABLE ACCESS FULL  | SYS_FILE_CONVERT_QUEUE |  |  9879K|
 ()| :: |

|*   |    INDEX UNIQUE SCAN  | SYS_C0014984           |      |     |
 ()| :: |

|    |    VIEW               |                        |      |    |
 ()| :: |

|    |     UNION-ALL         |                        |       |       |
    |          |

|*   |      INDEX UNIQUE SCAN| SYS_C0015191           |      |     |
 ()| :: |

|*   |      INDEX UNIQUE SCAN| SYS_C0015192           |      |     |
 ()| :: |

--------------------------------------------------------------------------------
----------------

Predicate Information (identified by operation id):
---------------------------------------------------

    - filter( NOT EXISTS (SELECT  FROM "SYS_ATT_FILE" "B" WHERE "B"."FD_ID"=:B
) OR

              NOT EXISTS (SELECT  FROM  ( (SELECT "FD_ID" "FD_ID" FROM "SYS_ATT
_MAIN" "SYS_ATT_MAIN"

              WHERE "FD_ID"=:B2) UNION ALL  (SELECT "FD_ID" "FD_ID" FROM "SYS_AT
T_RTF_DATA"

              "SYS_ATT_RTF_DATA" WHERE "FD_ID"=:B3)) "C"))
    - access("B"."FD_ID"=:B1)
    - access("FD_ID"=:B1)
    - access("FD_ID"=:B1)

Statistics
----------------------------------------------------------
            recursive calls
            db block gets
       consistent gets
            physical reads
            redo size
          bytes sent via SQL*Net to client
         bytes received via SQL*Net from client
            SQL*Net roundtrips to/from client
            sorts (memory)
            sorts (disk)
            rows processed