使用with as優化sql解決filter

lygle發表於2013-04-06
優化SQLFilter
 最近一個地市的報表系統老是說資料出得慢，基本上要到中午才能出資料，但是檢視過程是比較簡單的。後來發現一條sql有問題，居然要跑5個多小時。

檢視跑2個小時以上的sql
SELECT SQ.SQL_TEXT,
S.SQL_ID,
S.SID,
S.SERIAL#,
S.LAST_CALL_ET,
TO_CHAR(S.LOGON_TIME, 'yyyymmdd hh24:mi:ss') LOGON_TIME
FROM V$SESSION S,
V$SQLTEXT SQ
WHERE S.SQL_ID = SQ.SQL_ID AND
LAST_CALL_ET > 10000 AND
TO_CHAR(LOGON_TIME,'yyyymmdd') =TO_CHAR(SYSDATE,'yyyymmdd');


NTERVAL '7' DAY < D.COMPLETE_DT) 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
移機','資費變更') AND A.COMPLETE_DT - I 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A.BO_ACTION_NAME IN ('新裝', ' 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A.PROD_ID != D.PROD_ID AND 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
ARTY_ID AND A.BO_ID != D.BO_ID AND 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
TAFF_ID LIKE '36%' AND A.PARTY_ID = D.P 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
FROM DW_BO_ORDER D WHERE D.S 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
歡樂送之E6套餐') AND NOT EXISTS (SELECT * 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
'新春歡樂送之E8套餐', '新春 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
) 全省_緊密融合型E9套餐產品規格', 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
緊密融合型E9套餐產品規格', '(新 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
'普通E9','普通新版E8', '全省_ 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
2S','E6移動版', 'E9版1M(老版)', 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
', 'ADSL','LAN', '手機', 'E8 - 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
移機','資費變更') AND B.PROD_SPEC IN ('普通電話 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
D LIKE '36%' AND A.BO_ACTION_NAME IN ('新裝',' 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A.CHANNEL_ID = C.CHANNEL_ID AND A.SO_STAFF_I 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A WHERE A.PROD_ID = B.PROD_ID AND 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
DW_CRM_DAY_USER B, DW_BO_ORDER 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A.PROD_ID FROM DW_CHANNEL C, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
A.SO_STAFF_ID, A.ATOM_ACTION_ID, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
B.START_DT, A.BO_ACTION_NAME, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
B.ACCESS_NUMBER, B.PROD_SPEC, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
CHANNEL_NAME, B.NAME PARTY_NAME, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
B.AREA_NAME, C.NAME 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
SELECT B.AREA_ID, A.PARTY_ID, 4kyzp58tz0xya 232 811 15400 20111110 06:27:38
CREATE TABLE TMP_DTBB_FMT_10000_1 NOLOGGING AS 4kyzp58tz0xya 232 811 15400 20111110 06:27:38

找到的sql為如下：

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)
下面根據sql語句去查詢相關的session，發現該語句已經跑了將近4個小時，從早上6點多開始跑。

SQL> SELECT S.SQL_ID,to_char(S.LOGON_TIME,'yyyymmdd hh24:mi:ss') LOGON_TIME,S.LAST_CALL_ET,S.STATE FROM V$SESSION S WHERE S.SID=232;

SQL_ID LOGON_TIME LAST_CALL_ET STATE
------------- ----------------- ------------ -------------------
4kyzp58tz0xya 20111110 06:27:38 13647 WAITED SHORT TIME

SQL> select 13647/3600 from dual;

13647/3600
----------
3.79083333

SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') sysdat from dual;

SYSDAT
-----------------
20111110 10:18:39

OK，現在知道導致資料出的慢的原因,現在就開始來優化這條sql，首先收集一下統計圖，然後看執行計劃

BEGIN
DBMS_STATS.GATHER_TABLE_STATS(ownname => 'LBAS',
tabname => 'DW_BO_ORDER',
estimate_percent => 20,
method_opt => 'for all columns size auto',
no_invalidate => FALSE,
degree => 4,
granularity => 'ALL',
cascade => TRUE);
END;
/

  • 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)

    執行計劃裡面有個filter在裡面，這個是導致這條sql跑的慢的原因。主要語句就是在not exists 裡面居然存在!=， 哎，這sql語句寫得真坑爹，由於有!=的存在，CBO不能選擇 HASH_AJ join的方式，準備修改sql語句，但是不管怎麼改，業務邏輯總不對，最後的結果也不對。得想辦法吧filter搞掉，加多種hint，最後的結果還是一樣的，在朋友的幫下，最後使用了了with as. good最後居然實現了在12秒以內出資料。下面看一下

    WITH D AS
    (SELECT /*+ materialize */
    A.PARTY_ID,
    A.BO_ID,
    A.PROD_ID,
    A.COMPLETE_DT
    FROM DW_BO_ORDER A
    WHERE STAFF_ID LIKE '36%' AND
    A.BO_ACTION_NAME IN ('新裝',
    '移機',
    '資費變更'))
    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 A.PARTY_ID = D.PARTY_ID AND
    A.BO_ID != D.BO_ID AND
    A.PROD_ID != D.PROD_ID AND
    A.COMPLETE_DT - INTERVAL '7'
    DAY < D.COMPLETE_DT);

  • 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

    問題解決啦，這次過程中也學到了很多東西。

    • 來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/28673746/viewspace-757815/，如需轉載，請註明出處，否則將追究法律責任。

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