通过hint干掉笛卡尔积

Z_ZZZZZZZZ_BENE 大约有400万数据

修改前

 

SELECT xxxx
  FROM   (
          SELECT DISTINCT FIELD1_CONTENT
          FROM xxxxxxxx_LOG@DBLINK
          WHERE UPPER(TABLENAME) = 'Y_YYYYYYYYY_PRODUCT'
          AND DATECODE >= TO_DATE('2019-06-18 00:25:40','YYYY-MM-DD HH24:MI:SS')
          AND DATECODE <= TO_DATE('2019-06-19 01:06:49','YYYY-MM-DD HH24:MI:SS')
          AND BUSINESSTYPE = 'NEW'
         ) C,
        Y_YYYYYYYY_PRODUCT@DBLINK A,
        Z_ZZZZZZZZ_BENE@DBLINK B
    WHERE A.ITEM_ID   = C.FIELD1_CONTENT
  AND   A.XXXXXX_ID = B.XXXXXX_ID
  AND   A.XXXXXXX_1 = B.YYYYYYYY
  AND   B.XXXXXX_ID IS NOT NULL
  AND B.REAL_NAME<>'法定受益人'
  AND B.REAL_NAME<>'法定继承人'
  AND B.REAL_NAME<>'详见特别约定'
  AND B.REAL_NAME<>'祥见特别约定'
  AND B.REAL_NAME<>'法定'
  AND ( ( B.REAL_NAME IS NOT NULL
          AND B.CERTI_TYPE IS NOT NULL
          AND B.CERTI_CODE IS NOT NULL
        )
        OR
        ( B.REAL_NAME IS NOT NULL
          AND B.TELEPHONE IS NOT NULL
        )
      );

　　

修改前的执行计划，执行这个脚本大约4个小时没跑完。

SQL_ID  acbfjjjak0vub, child number 0
-------------------------------------
INSERT INTO xxxxxxxxxx SELECT   xxxxx  FROM   (  SELECT DISTINCT FIELD1_CONTENT
       FROM xxxxxxxx_LOG@DBLINK           WHERE UPPER(TABLENAME) =
'Y_YYYYYYYY_PRODUCT'           AND DATECODE >= TO_DATE('2019-06-18
00:25:40','YYYY-MM-DD HH24:MI:SS')           AND DATECODE <=
TO_DATE('2019-06-19 01:06:49','YYYY-MM-DD HH24:MI:SS')           AND
BUSINESSTYPE = 'NEW'          ) C,         Y_YYYYYYYY_PRODUCT@DBLINK A,
        Z_ZZZZZZZZ_BENE@DBLINK B     WHERE A.ITEM_ID   =
C.FIELD1_CONTENT   AND   A.XXXXXX_ID = B.XXXXXX_ID   A

Plan hash value: 2832774925

---------------------------------------------------------------------------------------------------------------
| Id  | Operation                | Name               | Rows  | Bytes | Cost (%CPU)| Time     | Inst   |IN-OUT|
---------------------------------------------------------------------------------------------------------------
|   0 | INSERT STATEMENT         |                    |       |       |   108K(100)|          |        |      |
|   1 |  LOAD TABLE CONVENTIONAL |                    |       |       |            |          |        |      |
|   2 |   NESTED LOOPS           |                    |     1 |   377 |   108K  (1)| 00:21:39 |        |      |
|   3 |    MERGE JOIN CARTESIAN  |                    |   606 |   194K|   107K  (1)| 00:21:25 |        |      |
|   4 |     REMOTE               | Z_ZZZZZZZZ_BENE    |     1 |   177 | 10849   (1)| 00:02:11 | DBLINK | R->S |
|   5 |     BUFFER SORT          |                    |  7277 |  1080K| 96163   (1)| 00:19:14 |        |      |
|   6 |      VIEW                |                    |  7277 |  1080K| 96163   (1)| 00:19:14 |        |      |
|   7 |       SORT UNIQUE        |                    |  7277 |   412K| 96163   (1)| 00:19:14 |        |      |
|   8 |        REMOTE            | xxxxxxxx_LOG       |  7278 |   412K| 96162   (1)| 00:19:14 | DBLINK | R->S |
|   9 |    REMOTE                | Y_YYYYYYYY_PRODUCT |     1 |    48 |     2   (0)| 00:00:01 | DBLINK | R->S |
---------------------------------------------------------------------------------------------------------------

Remote SQL Information (identified by operation id):
----------------------------------------------------

   4 - SELECT /*+ OPAQUE_TRANSFORM */ "BENE_ID","XXXXXX_ID","YYYYYYYY","BENE_TYPE","BENE_ORDER","REAL_N
       AME","CERTI_TYPE","CERTI_CODE","TELEPHONE","BENE_RATE" FROM "Z_ZZZZZZZZ_BENE" "B" WHERE ("TELEPHONE"
       IS NOT NULL OR "CERTI_TYPE" IS NOT NULL AND "CERTI_CODE" IS NOT NULL) AND "REAL_NAME"<>'法定受益人' AND
       "REAL_NAME"<>'法定继承人' AND "REAL_NAME"<>'详见特别约定' AND "REAL_NAME"<>'祥见特别约定' AND "REAL_NAME"<>'法定'
       (accessing 'DBLINK' )

   8 - SELECT /*+ OPAQUE_TRANSFORM */ "DATECODE","TABLENAME","FIELD1_CONTENT","BUSINESSTYPE" FROM
       "xxxxxxxx_LOG" "xxxxxxxx_LOG" WHERE "DATECODE">=TO_DATE(' 2019-06-18 00:25:40', 'syyyy-mm-dd
       hh24:mi:ss') AND "BUSINESSTYPE"='NEW' AND UPPER("TABLENAME")='Y_YYYYYYYY_PRODUCT' AND
       "DATECODE"<=TO_DATE(' 2019-06-19 01:06:49', 'syyyy-mm-dd hh24:mi:ss') (accessing 'DBLINK' )

   9 - SELECT /*+ OPAQUE_TRANSFORM */ "ITEM_ID","XXXXXX_ID","XXXXXXX_1","UPDATE_TIME" FROM
       "Y_YYYYYYYY_PRODUCT" "A" WHERE "ITEM_ID"=:1 AND "XXXXXX_ID"=:2 AND "XXXXXXX_1"=:3 (accessing 'DBLINK' )

　　

修改后的SQL

--省略处跟原SQL相同，只不过新增了/*+ cardinality(b 2000000) */

SELECT /*+ cardinality(b 2000000) */ xxxx
  FROM   (
          SELECT DISTINCT FIELD1_CONTENT
          FROM xxxxxxxx_LOG@DBLINK
  ....
;

　　

修改之后的执行计划

 Plan Hash Value  : 1238862255 

-----------------------------------------------------------------------------------------
| Id  | Operation        | Name               | Rows    | Bytes     | Cost   | Time     |
-----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                    |    7277 |   2081222 | 121654 | 00:24:20 |
| * 1 |   HASH JOIN      |                    |    7277 |   2081222 | 121654 | 00:24:20 |
|   2 |    NESTED LOOPS  |                    |    7277 |   1455400 | 110742 | 00:22:09 |
|   3 |     VIEW         |                    |    7277 |   1106104 |  96163 | 00:19:14 |
|   4 |      HASH UNIQUE |                    |    7277 |    422066 |  96163 | 00:19:14 |
|   5 |       REMOTE     | xxxxxxxx_LOG       |    7278 |    422124 |  96162 | 00:19:14 |
|   6 |     REMOTE       | Y_YYYYYYYY_PRODUCT |       1 |        48 |      2 | 00:00:01 |
|   7 |    REMOTE        | Z_ZZZZZZZZ_BENE    | 2000000 | 172000000 |  10928 | 00:02:12 |
-----------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
------------------------------------------
* 1 - access("A"."XXXXXX_ID"="B"."XXXXXX_ID" AND "A"."XXXXXXX_1"="B"."YYYYYYYY")

　　

Z_ZZZZZZZZ_BENE 大约有400万数据

修改前

SELECT xxxx

FROM (

SELECT DISTINCT FIELD1_CONTENT

FROM xxxxxxxx_LOG@DBLINK

WHERE UPPER(TABLENAME) = 'Y_YYYYYYYYY_PRODUCT'

AND DATECODE >= TO_DATE('2019-06-18 00:25:40','YYYY-MM-DD HH24:MI:SS')

AND DATECODE <= TO_DATE('2019-06-19 01:06:49','YYYY-MM-DD HH24:MI:SS')

AND BUSINESSTYPE = 'NEW'

) C,

Y_YYYYYYYY_PRODUCT@DBLINK A,

Z_ZZZZZZZZ_BENE@DBLINK B

WHERE A.ITEM_ID = C.FIELD1_CONTENT

AND A.XXXXXX_ID = B.XXXXXX_ID

AND A.XXXXXXX_1 = B.YYYYYYYY

AND B.XXXXXX_ID IS NOT NULL

AND B.REAL_NAME<>'法定受益人'

AND B.REAL_NAME<>'法定继承人'

AND B.REAL_NAME<>'详见特别约定'

AND B.REAL_NAME<>'祥见特别约定'

AND B.REAL_NAME<>'法定'

AND ( ( B.REAL_NAME IS NOT NULL

AND B.CERTI_TYPE IS NOT NULL

AND B.CERTI_CODE IS NOT NULL

)

OR

( B.REAL_NAME IS NOT NULL

AND B.TELEPHONE IS NOT NULL

)

);

  

SQL_ID acbfjjjak0vub, child number

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

INSERT INTO xxxxxxxxxx SELECT xxxxx FROM ( SELECT DISTINCT FIELD1_CONTENT

FROM xxxxxxxx_LOG@DBLINK WHERE UPPER(TABLENAME) =

'Y_YYYYYYYY_PRODUCT' AND DATECODE >= TO_DATE('2019-06-18

00:25:40','YYYY-MM-DD HH24:MI:SS') AND DATECODE <=

TO_DATE('2019-06-19 01:06:49','YYYY-MM-DD HH24:MI:SS') AND

BUSINESSTYPE = 'NEW' ) C, Y_YYYYYYYY_PRODUCT@DBLINK A,

Z_ZZZZZZZZ_BENE@DBLINK B WHERE A.ITEM_ID =

C.FIELD1_CONTENT AND A.XXXXXX_ID = B.XXXXXX_ID A

 

Plan hash value:

 

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

| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Inst |IN-OUT|

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

| | INSERT STATEMENT | | | | 108K()| | | |

| | LOAD TABLE CONVENTIONAL | | | | | | | |

| | NESTED LOOPS | | | | 108K ()| :: | | |

| | MERGE JOIN CARTESIAN | | | 194K| 107K ()| :: | | |

| | REMOTE | Z_ZZZZZZZZ_BENE | | | ()| :: | DBLINK | R->S |

| | BUFFER SORT | | | 1080K| ()| :: | | |

| | VIEW | | | 1080K| ()| :: | | |

| | SORT UNIQUE | | | 412K| ()| :: | | |

| | REMOTE | xxxxxxxx_LOG | | 412K| ()| :: | DBLINK | R->S |

| | REMOTE | Y_YYYYYYYY_PRODUCT | | | ()| :: | DBLINK | R->S |

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

 

Remote SQL Information (identified by operation id):

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

 

- SELECT /*+ OPAQUE_TRANSFORM */ "BENE_ID","XXXXXX_ID","YYYYYYYY","BENE_TYPE","BENE_ORDER","REAL_N

AME","CERTI_TYPE","CERTI_CODE","TELEPHONE","BENE_RATE" FROM "Z_ZZZZZZZZ_BENE" "B" WHERE ("TELEPHONE"

IS NOT NULL OR "CERTI_TYPE" IS NOT NULL AND "CERTI_CODE" IS NOT NULL) AND "REAL_NAME"<>'法定受益人' AND

"REAL_NAME"<>'法定继承人' AND "REAL_NAME"<>'详见特别约定' AND "REAL_NAME"<>'祥见特别约定' AND "REAL_NAME"<>'法定'

(accessing 'DBLINK' )

 

- SELECT /*+ OPAQUE_TRANSFORM */ "DATECODE","TABLENAME","FIELD1_CONTENT","BUSINESSTYPE" FROM

"xxxxxxxx_LOG" "xxxxxxxx_LOG" WHERE "DATECODE">=TO_DATE(' 2019-06-18 00:25:40', 'syyyy-mm-dd

hh24:mi:ss') AND "BUSINESSTYPE"='NEW' AND UPPER("TABLENAME")='Y_YYYYYYYY_PRODUCT' AND

"DATECODE"<=TO_DATE(' 2019-06-19 01:06:49', 'syyyy-mm-dd hh24:mi:ss') (accessing 'DBLINK' )

 

- SELECT /*+ OPAQUE_TRANSFORM */ "ITEM_ID","XXXXXX_ID","XXXXXXX_1","UPDATE_TIME" FROM

"Y_YYYYYYYY_PRODUCT" "A" WHERE "ITEM_ID"=: AND "XXXXXX_ID"=: AND "XXXXXXX_1"=: (accessing 'DBLINK' )

 

 

  

修改后

SELECT /*+ cardinality(b 2000000) */ xxxx

FROM (

SELECT DISTINCT FIELD1_CONTENT

FROM xxxxxxxx_LOG@DBLINK

WHERE UPPER(TABLENAME) = 'Y_YYYYYYYYY_PRODUCT'

AND DATECODE >= TO_DATE('2019-06-18 00:25:40','YYYY-MM-DD HH24:MI:SS')

AND DATECODE <= TO_DATE('2019-06-19 01:06:49','YYYY-MM-DD HH24:MI:SS')

AND BUSINESSTYPE = 'NEW'

) C,

Y_YYYYYYYY_PRODUCT@DBLINK A,

Z_ZZZZZZZZ_BENE@DBLINK B

WHERE A.ITEM_ID = C.FIELD1_CONTENT

AND A.XXXXXX_ID = B.XXXXXX_ID

AND A.XXXXXXX_1 = B.YYYYYYYY

AND B.XXXXXX_ID IS NOT NULL

AND B.REAL_NAME<>'法定受益人'

AND B.REAL_NAME<>'法定继承人'

AND B.REAL_NAME<>'详见特别约定'

AND B.REAL_NAME<>'祥见特别约定'

AND B.REAL_NAME<>'法定'

AND ( ( B.REAL_NAME IS NOT NULL

AND B.CERTI_TYPE IS NOT NULL

AND B.CERTI_CODE IS NOT NULL

)

OR

( B.REAL_NAME IS NOT NULL

AND B.TELEPHONE IS NOT NULL

)

);

  

修改之后的执行计划

Plan Hash Value :

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

| Id | Operation | Name | Rows | Bytes | Cost | Time |

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

| | SELECT STATEMENT | | | | | :: |

| * | HASH JOIN | | | | | :: |

| | NESTED LOOPS | | | | | :: |

| | VIEW | | | | | :: |

| | HASH UNIQUE | | | | | :: |

| | REMOTE | xxxxxxxx_LOG | | | | :: |

| | REMOTE | Y_YYYYYYYY_PRODUCT | | | | :: |

| | REMOTE | Z_ZZZZZZZZ_BENE | | | | :: |

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

Predicate Information (identified by operation id):

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

* - access("A"."XXXXXX_ID"="B"."XXXXXX_ID" AND "A"."XXXXXXX_1"="B"."YYYYYYYY")