ORACLE数据库SQL优化 not in 与not exits

各个表的数据量：

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

0 rows deleted.

Execution Plan
----------------------------------------------------------
Plan hash value: 3784236352

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

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

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

|   0 | DELETE STATEMENT     |                        | 64436 |  9879K|   125K
(1)| 00:25:11 |

|   1 |  DELETE              | SYS_FILE_CONVERT_QUEUE |       |       |
|          |

|*  2 |   FILTER             |                        |       |       |
|          |

|   3 |    TABLE ACCESS FULL | SYS_FILE_CONVERT_QUEUE | 64437 |  9879K|   869
(1)| 00:00:11 |

|   4 |    UNION-ALL         |                        |       |       |
|          |

|*  5 |     INDEX UNIQUE SCAN| SYS_C0015191           |     1 |    33 |     1
(0)| 00:00:01 |

|*  6 |     INDEX UNIQUE SCAN| SYS_C0015192           |     1 |    33 |     1
(0)| 00:00:01 |

|*  7 |    INDEX FULL SCAN   | SYS_C0014984           |     1 |    33 |   405
(1)| 00:00:05 |

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

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

2 - 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 0 FROM "SYS_ATT_FILE" "SYS_ATT_FILE" WHERE LNNVL("FD_ID"<>
:B3)))

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

Statistics
----------------------------------------------------------
94  recursive calls
0  db block gets
14521723  consistent gets
960  physical reads
116  redo size
832  bytes sent via SQL*Net to client
1052  bytes received via SQL*Net from client
3  SQL*Net roundtrips to/from client
22  sorts (memory)
0  sorts (disk)
0  rows processed

优化后，执行时间2秒不到
SQL> delete from sys_file_convert_queue a
2   where not exists
3   (select fd_id from sys_att_file b where a.fd_file_id = b.fd_id)
4      or not exists (select 1
5            from (select fd_id
6                    from sys_att_main
7                  union all
8                  select fd_id from sys_att_rtf_data) c
9           where a.fd_attmain_id = c.fd_id)
10  ;

0 rows deleted.

Execution Plan
----------------------------------------------------------
Plan hash value: 831590816

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

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

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

|   0 | DELETE STATEMENT      |                        | 64436 |  9879K| 63392
(1)| 00:12:41 |

|   1 |  DELETE               | SYS_FILE_CONVERT_QUEUE |       |       |
|          |

|*  2 |   FILTER              |                        |       |       |
|          |

|   3 |    TABLE ACCESS FULL  | SYS_FILE_CONVERT_QUEUE | 64437 |  9879K|   868
(1)| 00:00:11 |

|*  4 |    INDEX UNIQUE SCAN  | SYS_C0014984           |     1 |    33 |     1
(0)| 00:00:01 |

|   5 |    VIEW               |                        |     2 |   148 |     2
(0)| 00:00:01 |

|   6 |     UNION-ALL         |                        |       |       |
|          |

|*  7 |      INDEX UNIQUE SCAN| SYS_C0015191           |     1 |    33 |     1
(0)| 00:00:01 |

|*  8 |      INDEX UNIQUE SCAN| SYS_C0015192           |     1 |    33 |     1
(0)| 00:00:01 |

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

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

2 - filter( NOT EXISTS (SELECT 0 FROM "SYS_ATT_FILE" "B" WHERE "B"."FD_ID"=:B
1) OR

NOT EXISTS (SELECT 0 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"))
4 - access("B"."FD_ID"=:B1)
7 - access("FD_ID"=:B1)
8 - access("FD_ID"=:B1)

Statistics
----------------------------------------------------------
1  recursive calls
0  db block gets
243938  consistent gets
0  physical reads
0  redo size
837  bytes sent via SQL*Net to client
1099  bytes received via SQL*Net from client
3  SQL*Net roundtrips to/from client
1  sorts (memory)
0  sorts (disk)
0  rows processed