再次遭遇笛卡尔积

改为MERGE /*+ordered*/ INTO YJBZH_GRXDFHZMXJL GRXDFHZMXJL USING ( SELECT 
A.AGMT_ID AS AGMT_ID, B.CUST_NAME AS CUST_NAME FROM 
DWF.F_AGT_CADB_BOOK_H A, DWF.F_AGT_SAVB_BASICINFO_H B WHERE A.START_DT 
<= TO_DATE(:B1 ,'yyyy-mm-dd') AND A.END_DT > TO_DATE(:B1 ,'yyyy-mm-dd') 
AND B.START_DT <= TO_DATE(:B1 ,'yyyy-mm-dd') AND B.END_DT > TO_DATE(:B1 
,'yyyy-mm-dd') AND A.MASTER_CARD_NO = B.AGMT_ID ) SAVB_BASICINFO ON ( 
RTRIM(GRXDFHZMXJL.DFZH) = SAVB_BASICINFO.AGMT_ID AND CJRQ = 
TO_CHAR(TO_DATE(:B1 , 'YYYY-MM-DD'),'yyyymmdd') ) WHEN MATCHED THEN 
UPDATE SET GRXDFHZMXJL.DFHM = SAVB_BASICINFO.CUST_NAME

加了/*+order*/ 还是出现了笛卡尔积,不得不再加hints

SQL_ID  5wyfn0trgu5rx, child number 0
-------------------------------------
MERGE /*+  ORDERED  use_hash(A B) use_hash(A GRXDFHZMXJL)*/ INTO 
YJBZH_GRXDFHZMXJL GRXDFHZMXJL USING ( SELECT A.AGMT_ID AS AGMT_ID, 
B.CUST_NAME AS CUST_NAME FROM DWF.F_AGT_CADB_BOOK_H A, 
DWF.F_AGT_SAVB_BASICINFO_H B WHERE A.START_DT <= TO_DATE(:B1 
,'yyyy-mm-dd') AND A.END_DT > TO_DATE(:B1 ,'yyyy-mm-dd') AND B.START_DT 
<= TO_DATE(:B1 ,'yyyy-mm-dd') AND B.END_DT > TO_DATE(:B1 ,'yyyy-mm-dd') 
AND A.MASTER_CARD_NO = B.AGMT_ID ) SAVB_BASICINFO ON ( 
RTRIM(GRXDFHZMXJL.DFZH) = SAVB_BASICINFO.AGMT_ID AND CJRQ = 
TO_CHAR(TO_DATE(:B1 , 'YYYY-MM-DD'),'yyyymmdd') ) WHEN MATCHED THEN 
UPDATE SET GRXDFHZMXJL.DFHM = SAVB_BASICINFO.CUST_NAME
 
Plan hash value: 2400855618
 
--------------------------------------------------------------------------------------------------------
| Id  | Operation             | Name                   | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------------
|   0 | MERGE STATEMENT       |                        |       |       |       |   125K(100)|          |
|   1 |  MERGE                | YJBZH_GRXDFHZMXJL      |       |       |       |            |          |
|   2 |   VIEW                |                        |       |       |       |            |          |
|*  3 |    HASH JOIN          |                        |     1 |  1862 |       |   125K  (2)| 00:25:01 |
|*  4 |     TABLE ACCESS FULL | YJBZH_GRXDFHZMXJL      |     1 |  1762 |       | 12948   (1)| 00:02:36 |
|*  5 |     HASH JOIN         |                        |    11M|  1074M|   374M|   112K  (2)| 00:22:25 |
|*  6 |      TABLE ACCESS FULL| F_AGT_CADB_BOOK_H      |  5951K|   306M|       | 69245   (2)| 00:13:51 |
|*  7 |      TABLE ACCESS FULL| F_AGT_SAVB_BASICINFO_H |  2120K|    93M|       | 18256   (2)| 00:03:40 |
--------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   3 - access("A"."AGMT_ID"=RTRIM("GRXDFHZMXJL"."DFZH"))
   4 - filter("CJRQ"=TO_CHAR(TO_DATE(:B1,'YYYY-MM-DD'),'yyyymmdd'))
   5 - access("A"."MASTER_CARD_NO"="B"."AGMT_ID")
   6 - filter(("A"."MASTER_CARD_NO" IS NOT NULL AND "A"."START_DT"<=TO_DATE(:B1,'yyyy-mm-dd') 
              AND "A"."END_DT">TO_DATE(:B1,'yyyy-mm-dd')))
   7 - filter(("B"."START_DT"<=TO_DATE(:B1,'yyyy-mm-dd') AND 
              "B"."END_DT">TO_DATE(:B1,'yyyy-mm-dd')))