使用WITH AS 優化SQL
阿新 • • 發佈:2019-02-18
馬上就要單身節了,正在想今年我去禍害誰家的姑娘,突然QQ好友發來資訊,說能否幫忙優化一個SQL,SQL調優做得實在太多了,都已經麻木了,反正優化一個SQL也就幾秒鐘到幾分鐘的事情。
哥們說下面的SQL要跑5個多小時
SELECT B.AREA_ID, A.PARTY_ID, B.AREA_NAME, C.NAME CHANNEL_NAME, B.NAME PARTY_NAME, B.ACCESS_NUMBER, B.PROD_SPEC, B.START_DT, A.BO_ACTION_NAME, A.SO_STAFF_ID, A.ATOM_ACTION_ID, A.PROD_ID FROM DW_CHANNEL C, DW_CRM_DAY_USER B, DW_BO_ORDER A WHERE A.PROD_ID = B.PROD_ID AND A.CHANNEL_ID = C.CHANNEL_ID AND A.SO_STAFF_ID LIKE '36%' AND A.BO_ACTION_NAME IN ('新裝','移機','資費變更') AND B.PROD_SPEC IN ('普通電話', 'ADSL','LAN', '手機', 'E8 - 2S','E6移動版', 'E9版1M(老版)', '普通E9','普通新版E8', '全省_緊密融合型E9套餐產品規格', '(新) 全省_緊密融合型E9套餐產品規格', '新春歡樂送之E8套餐', '新春歡樂送之E6套餐') AND NOT EXISTS (SELECT * FROM DW_BO_ORDER D WHERE D.STAFF_ID LIKE '36%' AND A.PARTY_ID = D.PARTY_ID AND A.BO_ID != D.BO_ID AND A.PROD_ID != D.PROD_ID AND A.BO_ACTION_NAME IN ('新裝', '移機','資費變更') AND A.COMPLETE_DT - INTERVAL '7' DAY < D.COMPLETE_DT);
下面是執行計劃以及表資訊
SQL> select count(*) from dw_bo_order; COUNT(*) ---------- 2282548 SQL> select count(*) from dw_crm_day_user; COUNT(*) ---------- 420918 SQL> select count(*) from dw_channel; COUNT(*) ---------- 48031 Plan hash value: 2142862569 ---------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | ---------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 905 | 121K| 4152K (2)| 13:50:32 | | | |* 1 | FILTER | | | | | | | | |* 2 | HASH JOIN | | 905 | 121K| 12616 (2)| 00:02:32 | | | |* 3 | HASH JOIN | | 905 | 99550 | 12448 (2)| 00:02:30 | | | | 4 | PARTITION RANGE ALL| | 1979 | 108K| 9168 (2)| 00:01:51 | 1 | 5 | |* 5 | TABLE ACCESS FULL | DW_BO_ORDER | 1979 | 108K| 9168 (2)| 00:01:51 | 1 | 5 | |* 6 | TABLE ACCESS FULL | DW_CRM_DAY_USER | 309K| 15M| 3277 (2)| 00:00:40 | | | | 7 | TABLE ACCESS FULL | DW_CHANNEL | 48425 | 1276K| 168 (1)| 00:00:03 | | | |* 8 | FILTER | | | | | | | | | 9 | PARTITION RANGE ALL | | 1 | 29 | 9147 (2)| 00:01:50 | 1 | 5 | |* 10 | TABLE ACCESS FULL | DW_BO_ORDER | 1 | 29 | 9147 (2)| 00:01:50 | 1 | 5 | ---------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter( NOT EXISTS (SELECT /*+ */ 0 FROM "DW_BO_ORDER" "D" WHERE (:B1='新裝' OR :B2='移機' OR :B3='資費變更') AND "D"."PARTY_ID"=:B4 AND TO_CHAR("D"."STAFF_ID") LIKE '36%' AND "D"."COMPLETE_DT">:B5-INTERVAL'+07 00:00:00' DAY(2) TO SECOND(0) AND "D"."PROD_ID"<>:B6 AND "D"."BO_ID"<>:B7)) 2 - access("A"."CHANNEL_ID"="C"."CHANNEL_ID") 3 - access("A"."PROD_ID"="B"."PROD_ID") 5 - filter("A"."PROD_ID" IS NOT NULL AND ("A"."BO_ACTION_NAME"='新裝' OR "A"."BO_ACTION_NAME"='移機' OR "A"."BO_ACTION_NAME"='資費變更') AND TO_CHAR("A"."SO_STAFF_ID") LIKE '36%') 6 - filter("B"."PROD_SPEC"='(新) 全省_緊密融合型E9套餐產品規格' OR "B"."PROD_SPEC"='ADSL' OR "B"."PROD_SPEC"='E6移動版' OR "B"."PROD_SPEC"='E8 - 2S' OR "B"."PROD_SPEC"='E9版1M(老版)' OR "B"."PROD_SPEC"='LAN' OR "B"."PROD_SPEC"='普通E9' OR "B"."PROD_SPEC"='普通電話' OR "B"."PROD_SPEC"='普通新版E8' OR "B"."PROD_SPEC"='全省_緊密融合型E9套餐產品規格' OR "B"."PROD_SPEC"='手機' OR "B"."PROD_SPEC"='新春歡樂送之E6套餐' OR "B"."PROD_SPEC"='新春歡樂送之E8套餐') 8 - filter(:B1='新裝' OR :B2='移機' OR :B3='資費變更') 10 - filter("D"."PARTY_ID"=:B1 AND TO_CHAR("D"."STAFF_ID") LIKE '36%' AND "D"."COMPLETE_DT">:B2-INTERVAL'+07 00:00:00' DAY(2) TO SECOND(0) AND "D"."PROD_ID"<>:B3 AND "D"."BO_ID"<>:B4)
有經驗的人一看,一眼就知道這個SQL效能問題出在這裡
NOT EXISTS (SELECT * FROM DW_BO_ORDER D WHERE D.STAFF_ID LIKE '36%' AND A.PARTY_ID = D.PARTY_ID AND A.BO_ID != D.BO_ID AND A.PROD_ID != D.PROD_ID AND A.BO_ACTION_NAME IN ('新裝', '移機','資費變更') AND A.COMPLETE_DT - INTERVAL '7' DAY < D.COMPLETE_DT);
你一定要注意看,前面的NOT EXISTS 裡面套了 2個 != 尼瑪,坑爹啊,神馬業務邏輯啊,這個SQL太坑爹了,由於有!=的存在,CBO不能選擇 HASH_AJ join的方式,只能走FILTER,哈哈,走FILTER絕對搞死人,不是嗎?因為它要反覆掃描 DW_BO_ORDER 非常多次,那麼我建議那哥們把SQL改了,把裡面的!=拆分,不過可惜的是,不管他怎麼拆分,SQL業務邏輯總是不對,尼瑪誰叫我們寫SQL水平菜呢(自我批評一下)
於是建議他用下面的方法改寫SQL
with D as (select /*+ materialize */ PARTY_ID,BO_ID,PROD_ID from DW_BO_ORDER where STAFF_ID LIKE '36%')
SELECT
B.AREA_ID,
A.PARTY_ID,
B.AREA_NAME,
C.NAME CHANNEL_NAME,
B.NAME PARTY_NAME,
B.ACCESS_NUMBER,
B.PROD_SPEC,
B.START_DT,
A.BO_ACTION_NAME,
A.SO_STAFF_ID,
A.ATOM_ACTION_ID,
A.PROD_ID
FROM DW_CHANNEL C,
DW_CRM_DAY_USER B,
DW_BO_ORDER A
WHERE A.PROD_ID = B.PROD_ID AND
A.CHANNEL_ID = C.CHANNEL_ID AND
A.SO_STAFF_ID LIKE '36%' AND
A.BO_ACTION_NAME IN ('新裝','移機','資費變更') AND
B.PROD_SPEC IN ('普通電話', 'ADSL','LAN', '手機',
'E8 - 2S','E6移動版', 'E9版1M(老版)',
'普通E9','普通新版E8',
'全省_緊密融合型E9套餐產品規格',
'(新) 全省_緊密融合型E9套餐產品規格',
'新春歡樂送之E8套餐',
'新春歡樂送之E6套餐') AND
NOT EXISTS (SELECT *
FROM D
WHERE D.STAFF_ID LIKE '36%' AND
A.PARTY_ID = D.PARTY_ID AND
A.BO_ID != D.BO_ID AND
A.PROD_ID != D.PROD_ID AND
A.BO_ACTION_NAME IN
('新裝', '移機','資費變更') AND
A.COMPLETE_DT - INTERVAL '7' DAY < D.COMPLETE_DT);
執行計劃和SQL執行時間如下:
SQL> set timi on
SQL> WITH D AS
2 (SELECT /*+ materialize */
3 PARTY_ID,
4 BO_ID,
5 PROD_ID,
6 COMPLETE_DT
7 FROM DW_BO_ORDER
8 WHERE STAFF_ID LIKE '36%' AND
9 BO_ACTION_NAME IN ('新裝',
10 '移機',
11 '資費變更'))
12 SELECT
13 B.AREA_ID,
14 A.PARTY_ID,
15 B.AREA_NAME,
16 C.NAME CHANNEL_NAME,
17 B.NAME PARTY_NAME,
18 B.ACCESS_NUMBER,
19 B.PROD_SPEC,
20 B.START_DT,
21 A.BO_ACTION_NAME,
22 A.SO_STAFF_ID,
23 A.ATOM_ACTION_ID,
24 A.PROD_ID
25 FROM DW_CHANNEL C,
26 DW_CRM_DAY_USER B,
27 DW_BO_ORDER A
28 WHERE A.PROD_ID = B.PROD_ID AND
29 A.CHANNEL_ID = C.CHANNEL_ID AND
30 A.SO_STAFF_ID LIKE '36%' AND
31 A.BO_ACTION_NAME IN ('新裝','移機','資費變更') AND
32 B.PROD_SPEC IN ('普通電話', 'ADSL','LAN', '手機',
33 'E8 - 2S','E6移動版', 'E9版1M(老版)',
34 '普通E9','普通新版E8',
35 '全省_緊密融合型E9套餐產品規格',
36 '(新) 全省_緊密融合型E9套餐產品規格',
37 '新春歡樂送之E8套餐',
38 '新春歡樂送之E6套餐') AND
39 NOT EXISTS (SELECT *
40 FROM D
41 WHERE A.PARTY_ID = D.PARTY_ID AND
42 A.BO_ID != D.BO_ID AND
43 A.PROD_ID != D.PROD_ID AND
44 A.COMPLETE_DT - INTERVAL '7' DAY < D.COMPLETE_DT);
已選擇49245行。
已用時間: 00: 00: 12.37
執行計劃
--------------------------------------------------------------------------------------------------------------------------
Plan hash value: 2591883460
--------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
--------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 905 | 121K| 62428 (2)| 00:12:30 | | |
| 1 | TEMP TABLE TRANSFORMATION | | | | | | | |
| 2 | LOAD AS SELECT | DW_BO_ORDER | | | | | | |
| 3 | PARTITION RANGE ALL | | 114K| 3228K| 9127 (2)| 00:01:50 | 1 | 5 |
|* 4 | TABLE ACCESS FULL | DW_BO_ORDER | 114K| 3228K| 9127 (2)| 00:01:50 | 1 | 5 |
|* 5 | FILTER | | | | | | | |
|* 6 | HASH JOIN | | 905 | 121K| 12616 (2)| 00:02:32 | | |
|* 7 | HASH JOIN | | 905 | 99550 | 12448 (2)| 00:02:30 | | |
| 8 | PARTITION RANGE ALL | | 1979 | 108K| 9168 (2)| 00:01:51 | 1 | 5 |
|* 9 | TABLE ACCESS FULL | DW_BO_ORDER | 1979 | 108K| 9168 (2)| 00:01:51 | 1 | 5 |
|* 10 | TABLE ACCESS FULL | DW_CRM_DAY_USER | 309K| 15M| 3277 (2)| 00:00:40 | | |
| 11 | TABLE ACCESS FULL | DW_CHANNEL | 48425 | 1276K| 168 (1)| 00:00:03 | | |
|* 12 | FILTER | | | | | | | |
|* 13 | VIEW | | 114K| 6791K| 90 (3)| 00:00:02 | | |
| 14 | TABLE ACCESS FULL | SYS_TEMP_0FD9D662E_D625B872 | 114K| 3228K| 90 (3)| 00:00:02 | | |
--------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - filter(TO_CHAR("STAFF_ID") LIKE '36%')
5 - filter( NOT EXISTS (SELECT /*+ */ 0 FROM (SELECT /*+ CACHE_TEMP_TABLE ("T1") */ "C0" "STAFF_ID","C1"
"PARTY_ID","C2" "BO_ID","C3" "PROD_ID","C4" "COMPLETE_DT" FROM "SYS"."SYS_TEMP_0FD9D662E_D625B872" "T1") "D"
WHERE (:B1='新裝' OR :B2='移機' OR :B3='資費變更') AND TO_CHAR("D"."STAFF_ID") LIKE '36%' AND "D"."PARTY_ID"=:B4 AND
"D"."BO_ID"<>:B5 AND "D"."PROD_ID"<>:B6 AND "D"."COMPLETE_DT">:B7-INTERVAL'+07 00:00:00' DAY(2) TO SECOND(0)))
6 - access("A"."CHANNEL_ID"="C"."CHANNEL_ID")
7 - access("A"."PROD_ID"="B"."PROD_ID")
9 - filter("A"."PROD_ID" IS NOT NULL AND ("A"."BO_ACTION_NAME"='新裝' OR "A"."BO_ACTION_NAME"='移機' OR
"A"."BO_ACTION_NAME"='資費變更') AND TO_CHAR("A"."SO_STAFF_ID") LIKE '36%')
10 - filter("B"."PROD_SPEC"='(新) 全省_緊密融合型E9套餐產品規格' OR "B"."PROD_SPEC"='ADSL' OR "B"."PROD_SPEC"='E6移動版' OR
"B"."PROD_SPEC"='E8 - 2S' OR "B"."PROD_SPEC"='E9版1M(老版)' OR "B"."PROD_SPEC"='LAN' OR "B"."PROD_SPEC"='普通E9' OR
"B"."PROD_SPEC"='普通電話' OR "B"."PROD_SPEC"='普通新版E8' OR "B"."PROD_SPEC"='全省_緊密融合型E9套餐產品規格' OR "B"."PROD_SPEC"='手機'
OR "B"."PROD_SPEC"='新春歡樂送之E6套餐' OR "B"."PROD_SPEC"='新春歡樂送之E8套餐')
12 - filter(:B1='新裝' OR :B2='移機' OR :B3='資費變更')
13 - filter(TO_CHAR("D"."STAFF_ID") LIKE '36%' AND "D"."PARTY_ID"=:B1 AND "D"."BO_ID"<>:B2 AND
"D"."PROD_ID"<>:B3 AND "D"."COMPLETE_DT">:B4-INTERVAL'+07 00:00:00' DAY(2) TO SECOND(0))
統計資訊
----------------------------------------------------------
2 recursive calls
29 db block gets
110506 consistent gets
22 physical reads
656 redo size
2438096 bytes sent via SQL*Net to client
449 bytes received via SQL*Net from client
11 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
49245 rows processed
現在SQL 12秒可以跑完了,這個SQL優化到這裡就行了,不能連線他的DB,媽的我業務邏輯也不清楚,奶奶的,神馬時候幫別人優化一個SQL 一行一元。
想要跟我學優化的,請點選這裡