背景
开发说：
有段SQL语句，去掉order by很快，有order by之后，查询1小时都无法返回结果。
我叫他把SQL扔给我看下。
SQL代码及执行计划
select *
from (select d.*, rownum as num
from (SELECT A.BILLNO,
A.BILLCODE,
A.GETDATE,
A.GETUNITCODE,
A.GETCODE,
A.GETORGANCODE,
A.USEORGANCODE,
A.USEDATE,
A.USEUNITCODE,
A.USERCODE,
A.CURRENCYCODE,
A.AMOUNT,
A.NAME,
A.NOTES,
A.STATUSCODE,
A.IFPAGEONHOLE,
A.OPCODE,
A.OPUNITCODE,
A.OPDATE,
A.LOCKTIME,
A.GETAGENTCODE,
(SELECT D.AGENTNAME
FROM SYN_MM_AGENTCODE_TC D
WHERE D.AGENTCODE = A.GETAGENTCODE) AS GETAGENTNAME,
A.USEAGENTCODE,
A.OUTSTATUS,
CASE A.BILLCODE
WHEN 'B2010005' THEN
A.FACTBILLCODE
ELSE
''
END FACTBILLCODE,
A.SALES,
A.FROMDATE,
A.TODATE,
(SELECT BILLNAME
FROM BD_BILLCODE
WHERE BILLCODE = A.BILLCODE) BILLNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.USERCODE) USERNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.GETCODE) GETERNAME,
(SELECT NO3
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICENO,
(SELECT NO4
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICECODE
FROM B_BILL A
WHERE 3 > 2
AND (3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2)
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND ((TRIM(GETUNITCODE) = '013100' OR
GETAGENTCODE IN
(SELECT DISTINCT A.AGENTCODE
FROM CIOD_IM.CHAGENTBASE A
WHERE 1 = 1
AND TRIM(A.BRANCHCODE) = '013100')))
ORDER BY A.BILLNO) d
where rownum <= 100)
where num > 0
;
Plan hash value: 677599094
--------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 6 | 27792 | 11 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID | CHAGENTBASE | 1 | 56 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDX_CHAGENTBASE_TEST | 1 | | 1 (0)| 00:00:01 |
| 3 | TABLE ACCESS BY INDEX ROWID | BD_BILLCODE | 1 | 31 | 1 (0)| 00:00:01 |
|* 4 | INDEX UNIQUE SCAN | PK_BD_BILLCODE | 1 | | 0 (0)| 00:00:01 |
| 5 | TABLE ACCESS BY INDEX ROWID | T_EMPLOYEE_VIEW | 1 | 26 | 2 (0)| 00:00:01 |
|* 6 | INDEX RANGE SCAN | IND_T_EMPLOYEE_VIEW | 1 | | 1 (0)| 00:00:01 |
| 7 | TABLE ACCESS BY INDEX ROWID | T_EMPLOYEE_VIEW | 1 | 26 | 2 (0)| 00:00:01 |
|* 8 | INDEX RANGE SCAN | IND_T_EMPLOYEE_VIEW | 1 | | 1 (0)| 00:00:01 |
| 9 | TABLE ACCESS BY INDEX ROWID | B_BILLDETAIL | 1 | 50 | 4 (0)| 00:00:01 |
|* 10 | INDEX RANGE SCAN | PK_B_BILLDETAIL_02 | 1 | | 3 (0)| 00:00:01 |
| 11 | TABLE ACCESS BY INDEX ROWID | B_BILLDETAIL | 1 | 50 | 4 (0)| 00:00:01 |
|* 12 | INDEX RANGE SCAN | PK_B_BILLDETAIL_02 | 1 | | 3 (0)| 00:00:01 |
|* 13 | VIEW | | 6 | 27792 | 11 (0)| 00:00:01 |
|* 14 | COUNT STOPKEY | | | | | |
| 15 | VIEW | | 6 | 27714 | 11 (0)| 00:00:01 |
|* 16 | FILTER | | | | | |
| 17 | TABLE ACCESS BY INDEX ROWID| B_BILL | 56M| 10G| 11 (0)| 00:00:01 |
| 18 | INDEX FULL SCAN | PK_B_BILL_01 | 100 | | 4 (0)| 00:00:01 |
|* 19 | TABLE ACCESS BY INDEX ROWID| CHAGENTBASE | 1 | 15 | 2 (0)| 00:00:01 |
|* 20 | INDEX RANGE SCAN | IDX_CHAGENTBASE_TEST | 1 | | 1 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("D"."AGENTCODE"=:B1)
4 - access("BILLCODE"=:B1)
6 - access("A"."CODE"=:B1)
8 - access("A"."CODE"=:B1)
10 - access("BILLNO"=:B1 AND "BILLCODE"=:B2 AND "FACTBILLCODE"=:B3)
12 - access("BILLNO"=:B1 AND "BILLCODE"=:B2 AND "FACTBILLCODE"=:B3)
13 - filter("NUM">0)
14 - filter(ROWNUM<=100)
16 - filter(TRIM("GETUNITCODE")='013100' OR EXISTS (SELECT /*+ */ 0 FROM
"CIOD_IM"."CHAGENTBASE" "A" WHERE "A"."AGENTCODE"=:B1 AND TRIM("A"."BRANCHCODE")='013100'))
19 - filter(TRIM("A"."BRANCHCODE")='013100')
20 - access("A"."AGENTCODE"=:B1)
优化
1）建立索引
create index IDX_B_BILL_TEST03 on B_BILL (GETAGENTCODE, BILLNO);2）添加hint
/*+index_rs(a)*/3）or改写成union
select *
from (select d.*, rownum as num
from (SELECT /*+index_rs(a)*/
A.BILLNO,
A.BILLCODE,
A.GETDATE,
A.GETUNITCODE,
A.GETCODE,
A.GETORGANCODE,
A.USEORGANCODE,
A.USEDATE,
A.USEUNITCODE,
A.USERCODE,
A.CURRENCYCODE,
A.AMOUNT,
A.NAME,
A.NOTES,
A.STATUSCODE,
A.IFPAGEONHOLE,
A.OPCODE,
A.OPUNITCODE,
A.OPDATE,
A.LOCKTIME,
A.GETAGENTCODE,
(SELECT D.AGENTNAME
FROM SYN_MM_AGENTCODE_TC D
WHERE D.AGENTCODE = A.GETAGENTCODE) AS GETAGENTNAME,
A.USEAGENTCODE,
A.OUTSTATUS,
CASE A.BILLCODE
WHEN 'B2010005' THEN
A.FACTBILLCODE
ELSE
''
END FACTBILLCODE,
A.SALES,
A.FROMDATE,
A.TODATE,
(SELECT BILLNAME FROM BD_BILLCODE WHERE BILLCODE = A.BILLCODE) BILLNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.USERCODE) USERNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.GETCODE) GETERNAME,
(SELECT NO3
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICENO,
(SELECT NO4
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICECODE
FROM B_BILL A
WHERE 3 > 2
AND (3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2)
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND ((TRIM(GETUNITCODE) = '013100' /*OR
GETAGENTCODE IN
(SELECT A.AGENTCODE
FROM CIOD_IM.CHAGENTBASE A
WHERE 1 = 1
AND TRIM(A.BRANCHCODE) = '013100')*/
))
union
SELECT A.BILLNO,
A.BILLCODE,
A.GETDATE,
A.GETUNITCODE,
A.GETCODE,
A.GETORGANCODE,
A.USEORGANCODE,
A.USEDATE,
A.USEUNITCODE,
A.USERCODE,
A.CURRENCYCODE,
A.AMOUNT,
A.NAME,
A.NOTES,
A.STATUSCODE,
A.IFPAGEONHOLE,
A.OPCODE,
A.OPUNITCODE,
A.OPDATE,
A.LOCKTIME,
A.GETAGENTCODE,
(SELECT D.AGENTNAME
FROM SYN_MM_AGENTCODE_TC D
WHERE D.AGENTCODE = A.GETAGENTCODE) AS GETAGENTNAME,
A.USEAGENTCODE,
A.OUTSTATUS,
CASE A.BILLCODE
WHEN 'B2010005' THEN
A.FACTBILLCODE
ELSE
''
END FACTBILLCODE,
A.SALES,
A.FROMDATE,
A.TODATE,
(SELECT BILLNAME
FROM BD_BILLCODE
WHERE BILLCODE = A.BILLCODE) BILLNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.USERCODE) USERNAME,
(SELECT HANDLERNAME
FROM BD_HANDLER
WHERE HANDLERCODE = A.GETCODE) GETERNAME,
(SELECT NO3
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICENO,
(SELECT NO4
FROM B_BILLDETAIL
WHERE BILLNO = A.BILLNO
AND BILLCODE = A.BILLCODE
AND FACTBILLCODE = A.FACTBILLCODE) ONLINEINVOICECODE
FROM B_BILL A
WHERE 3 > 2
AND (3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2 OR 3 > 2)
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND 3 > 2
AND (( /*TRIM(GETUNITCODE) = '013100' OR*/
GETAGENTCODE IN
(SELECT A.AGENTCODE
FROM CIOD_IM.CHAGENTBASE A
WHERE 1 = 1
AND TRIM(A.BRANCHCODE) = '013100')))
ORDER BY BILLNO) d
where rownum <= 100)
where num > 0;
Plan hash value: 215809904
--------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 100 | 452K| | 76511 (34)| 00:15:19 |
|* 1 | VIEW | | 100 | 452K| | 76511 (34)| 00:15:19 |
|* 2 | COUNT STOPKEY | | | | | | |
| 3 | VIEW | | 570K| 2511M| | 76511 (34)| 00:15:19 |
|* 4 | SORT UNIQUE STOPKEY | | 570K| 104M| 278M| 50812 (46)| 00:10:10 |
| 5 | UNION-ALL | | | | | | |
| 6 | TABLE ACCESS BY INDEX ROWID| B_BILL | 569K| 104M| | 3755 (1)| 00:00:46 |
|* 7 | INDEX RANGE SCAN | IDX_B_BILL_TEST | 227K| | | 771 (1)| 00:00:10 |
| 8 | TABLE ACCESS BY INDEX ROWID| B_BILL | 81 | 15552 | | 7742 (1)| 00:01:33 |
| 9 | NESTED LOOPS | | 262 | 54234 | | 23093 (1)| 00:04:38 |
|* 10 | TABLE ACCESS FULL | CHAGENTBASE | 3 | 45 | | 6 (0)| 00:00:01 |
|* 11 | INDEX RANGE SCAN | IDX_B_BILL_TEST03 | 1089 | | | 7672 (1)| 00:01:33 |
--------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("NUM">0)
2 - filter(ROWNUM<=100)
4 - filter(ROWNUM<=100)
7 - access(TRIM("GETUNITCODE")='013100')
10 - filter(TRIM("A"."BRANCHCODE")='013100')
11 - access("GETAGENTCODE"="A"."AGENTCODE")
filter("GETAGENTCODE" IS NOT NULL)优化后
1s能返回结果，性能大大提升。开发很开心地把SQL拿走了。