查询优化或调优
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【中文标题】查询优化或调优【英文标题】：Query Optimize or Tuning 【发布时间】：2018-02-04 06:00:04 【问题描述】：我对 SQL 相当陌生，并且对我一直在处理的查询有点不了解。我需要优化下面的 SQL 查询。谁能建议如何优化以下查询及其效率。
WITH MAL_BAL AS
(SELECT
/*+parallel(2) */
DATE,
BPD,
A.MNO,
A.BRT,
A.BRTD,
BDR,
B.CDNO,
B.CGNO,
B.BT_DR_AMT,
B.BT_CR_AMT,
B.BT_DR_NUM,
B.BT_CR_NUM
FROM ABC.POST A
LEFT OUTER JOIN ABC.BALL B
ON ( A.BRTD = B.BRTD
AND A.BRT = B.BRT)
WHERE DATE = TO_DATE ('20170131', 'YYYYMMDD')
AND B.BRTD BETWEEN TRUNC (ADD_MONTHS (TO_DATE ('20170131', 'YYYYMMDD'), - 1),'MM') AND TO_DATE ('20170131', 'YYYYMMDD')
AND BAT_DPST_TYP_CDE NOT IN ('S', 'V')
AND B.PRCS_CENTRE_CDE = 'NA'
),
A_LKUP AS
(SELECT
/*+parallel(2)*/
AA.DATE,
AA.MNO,
AA.CDNO,
AA.CGNO,
AA.DAC,
AA.PAC,
CTD_DB_AMT,
CTD_CR_NUM,
CTD_DB_NUM,
CTD_CR_AMT,
B.BRT,
B.BRTD,
CC.M_DC,
CASE
WHEN CC.M_DC IN ('E','P','A','I')
THEN NVL (CC.NPT_DACE,AA.DAC)
END AS DAC_LKP,
CASE
WHEN CC.M_DC IN ('E','P','A','I')
THEN NVL (CC.NPT_INTCHG_AMT_AT_CDE,DD.PRD_AT_INTCHG_AMT)
END AS INTCHG_AMT_LKP,
CASE
WHEN CC.M_DC IN ('E','P','A','I')
THEN NVL (CC.NPT_ASSMNT_AT_CDE,DD.PRD_ASSMNT_AT_COD)
END AS ASSMNT_AT_LKP,
CASE
WHEN CC.M_PC IN ('E','P','A','I')
THEN NVL (CC.NPT_PACE, AA.PAC)
END AS PAC_LKP,
CASE
WHEN CC.M_PC IN ('E','P','A','I')
THEN NVL (CC.NPT_ASSMNT_PITM_AT_CDE, DD.PRD_ASSMNT_PITM_AT)
END AS PITM_ASSMNT_AT_LKP,
CASE
WHEN CC.M_DC IN ('E', 'P', 'A', 'I')
THEN NVL (CC.NPT_INTCHG_AMT_AT_CDE, DD.PRD_AT_INTCHG_AMT)
ELSE AA.PRD_AT_INTCHG_AMT
END INTCHG_AMT_APL_TYP_CDE,
CASE
WHEN CC.M_PC IN ('E', 'P', 'A', 'I')
THEN NVL (CC.NPT_INTCHG_PCT_AT_CDE, DD.PRD_AT_INTCHG_PCT)
ELSE AA.PRD_AT_INTCHG_PCT
END AS INTCHG_PCT_APL_TYP_CDE,
CASE
WHEN CC.M_DC IN ('E', 'P', 'A', 'I')
THEN NVL (CC.NPT_ASSMNT_AT_CDE, DD.PRD_ASSMNT_AT_COD)
ELSE AA.PRD_ASM_DISC_AT_CDE
END PRD_ASSMNT_AT_CDE,
CASE
WHEN CC.M_PC IN ('E', 'P', 'A', 'I')
THEN NVL (CC.NPT_ASSMNT_PITM_AT_CDE,DD.PRD_ASSMNT_PITM_AT)
ELSE AA.PRD_ASM_PITM_AT_CDE
END AS PRD_ASSMNT_PITM_AT_CDE
FROM MP.MALL AA
INNER JOIN MAL_BAL B
ON AA.DATE = B.DATE
AND AA.MNO = B.MNO
AND AA.BILL_TYP = 'MD'
AND AA.CDNO = B.CDNO
AND AA.CGNO = B.CGNO
LEFT OUTER JOIN MP.M_T1 BB
ON AA.MNO = BB.MNO
LEFT OUTER JOIN MP.N_T1CC
ON AA.CLG_NUM = CC.CLG_CF_NUM
AND AA.CDNO = CC.CDNO
AND AA.CGNO = CC.CGNO
AND BB.PMF_NPP_NUM = CC.NPP_NUM
LEFT OUTER JOIN MP.P_T1 DD
ON AA.CLNO = DD.CLG_CF_NUM
AND AA.CDNO = DD.CDNO
AND AA.CGNO = DD.CGNO
),
APL_CD AS
(SELECT
/*+parallel(2)*/
DATE,
MNO,
CDNO,
CGNO,
BRT,
BRTD,
CASE
WHEN M_DC NOT IN ('E','P','A','I')
THEN DAC
WHEN DAC_LKP = 'D'
THEN (
CASE
WHEN CTD_DB_AMT = 0
THEN (
CASE
WHEN DAC_LKP = INTCHG_AMT_LKP
THEN ASSMNT_AT_LKP
WHEN DAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
WHEN CTD_DB_AMT <> 0
THEN (
CASE
WHEN DAC_LKP = INTCHG_AMT_LKP
THEN DAC_LKP
WHEN DAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
END)
WHEN DAC_LKP = 'C'
THEN (
CASE
WHEN CTD_CR_AMT = 0
THEN (
CASE
WHEN DAC_LKP = INTCHG_AMT_LKP
THEN ASSMNT_AT_LKP
WHEN DAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
WHEN CTD_CR_AMT <> 0
THEN (
CASE
WHEN DAC_LKP = INTCHG_AMT_LKP
THEN DAC_LKP
WHEN DAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
END)
WHEN DAC_LKP NOT IN ('D', 'C')
THEN DAC_LKP
END
DAC,
-- PITM APPLY TYPE CODE
CASE
WHEN M_DC NOT IN ('E','P','A','I')
THEN PAC
WHEN PAC_LKP = 'D'
THEN (
CASE
WHEN CTD_DB_NUM = 0
THEN (
CASE
WHEN PAC_LKP = INTCHG_AMT_LKP
THEN PITM_ASSMNT_AT_LKP
WHEN PAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
WHEN CTD_DB_NUM <> 0
THEN (
CASE
WHEN PAC_LKP = INTCHG_AMT_LKP
THEN PITM_ASSMNT_AT_LKP
WHEN PAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
END)
WHEN PAC_LKP = 'C'
THEN (
CASE
WHEN CTD_CR_NUM = 0
THEN (
CASE
WHEN PAC_LKP = INTCHG_AMT_LKP
THEN ASSMNT_AT_LKP
WHEN PAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
WHEN CTD_CR_NUM <> 0
THEN (
CASE
WHEN PAC_LKP = INTCHG_AMT_LKP
THEN PAC_LKP
WHEN PAC_LKP <> INTCHG_AMT_LKP
THEN INTCHG_AMT_LKP
END)
END)
WHEN PAC_LKP NOT IN ('D', 'C')
THEN PAC_LKP
END
PAC,
INTCHG_AMT_APL_TYP_CDE,
INTCHG_PCT_APL_TYP_CDE,
PRD_ASSMNT_AT_CDE,
PRD_ASSMNT_PITM_AT_CDE
FROM A_LKUP
),
MAL_BAL_MALL AS
(SELECT
/*+parallel(2) */
A.DATE,
A.CLNO,
A.CDNO,
A.CGNO,
A.MNO,
B.BRT,
B.BRTD,
B.BDR,
A.CPT_ID,
A.CTD_DB_AMT,
A.CTD_CR_AMT,
A.CTD_DB_NUM,
A.CTD_CR_NUM,
TRUNC (
CASE
WHEN A.CTD_FEE_DSCNT_AMT = 0
THEN 0
WHEN A.CTD_FEE_DSCNT_AMT <> 0
THEN (
CASE
WHEN C.DAC = 'N'
AND (A.CTD_DB_AMT - A.CTD_CR_AMT) = 0
THEN 0
WHEN C.DAC = 'N'
AND (A.CTD_DB_AMT - A.CTD_CR_AMT) <> 0
THEN ( ( B.BT_DR_AMT - B.BT_CR_AMT) / (A.CTD_DB_AMT - A.CTD_CR_AMT)) * A.CTD_FEE_DSCNT_AMT
WHEN C.DAC = 'G'
AND (A.CTD_DB_AMT + A.CTD_CR_AMT) = 0
THEN 0
WHEN C.DAC = 'G'
AND (A.CTD_DB_AMT + A.CTD_CR_AMT) <> 0
THEN ( ( B.BT_DR_AMT + B.BT_CR_AMT) / (A.CTD_DB_AMT + A.CTD_CR_AMT)) * A.CTD_FEE_DSCNT_AMT
WHEN C.DAC = 'C'
AND A.CTD_CR_AMT = 0
THEN 0
WHEN C.DAC = 'C'
AND A.CTD_CR_AMT <> 0
THEN (B.BT_CR_AMT / A.CTD_CR_AMT) * A.CTD_FEE_DSCNT_AMT
WHEN C.DAC = 'D'
AND A.CTD_DB_AMT = 0
THEN 0
WHEN C.DAC = 'D'
AND A.CTD_DB_AMT <> 0
THEN (B.BT_DR_AMT / A.CTD_DB_AMT) * A.CTD_FEE_DSCNT_AMT
ELSE 0
END)
END, 6) BAT_PRD_FEE_DSCNT_AMT,
TRUNC (
CASE
WHEN A.CTD_FEE_PITM_AMT = 0
THEN 0
WHEN A.CTD_FEE_PITM_AMT <> 0
THEN (
CASE
WHEN C.PAC = 'N'
AND (A.CTD_DB_NUM - A.CTD_CR_NUM) = 0
THEN 0
WHEN C.PAC = 'N'
AND (A.CTD_DB_NUM - A.CTD_CR_NUM) <> 0
THEN ( ( B.BT_DR_NUM - B.BT_CR_NUM) / (A.CTD_DB_NUM - A.CTD_CR_NUM)) * A.CTD_FEE_PITM_AMT
WHEN C.PAC = 'G'
AND (A.CTD_DB_NUM + A.CTD_CR_NUM) = 0
THEN 0
WHEN C.PAC = 'G'
AND (A.CTD_DB_NUM + A.CTD_CR_NUM) <> 0
THEN ( ( B.BT_DR_NUM + B.BT_CR_NUM) / (A.CTD_DB_NUM + A.CTD_CR_NUM)) * A.CTD_FEE_PITM_AMT
WHEN C.PAC = 'C'
AND A.CTD_CR_NUM = 0
THEN 0
WHEN C.PAC = 'C'
AND A.CTD_CR_NUM <> 0
THEN (B.BT_CR_NUM / A.CTD_CR_NUM) * A.CTD_FEE_PITM_AMT
WHEN C.PAC = 'D'
AND A.CTD_DB_NUM = 0
THEN 0
WHEN C.PAC = 'D'
AND A.CTD_DB_NUM <> 0
THEN (B.BT_DR_NUM / A.CTD_DB_NUM) * A.CTD_FEE_PITM_AMT
ELSE 0
END)
END, 6) BAT_PRD_FEE_PITM_AMT,
TRUNC (
CASE
WHEN A.CTD_INTCHG_AMT = 0
THEN 0
WHEN A.CTD_INTCHG_AMT <> 0
THEN (
CASE
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'N'
AND (A.CTD_DB_AMT - A.CTD_CR_AMT) = 0
THEN 0
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'N'
AND (A.CTD_DB_AMT - A.CTD_CR_AMT) <> 0
THEN ( ( B.BT_DR_AMT - B.BT_CR_AMT) / (A.CTD_DB_AMT - A.CTD_CR_AMT)) * A.CTD_INTCHG_AMT
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'G'
AND (A.CTD_DB_AMT + A.CTD_CR_AMT) = 0
THEN 0
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'G'
AND (A.CTD_DB_AMT + A.CTD_CR_AMT) <> 0
THEN ( ( B.BT_DR_AMT + B.BT_CR_AMT) / (A.CTD_DB_AMT + A.CTD_CR_AMT)) * A.CTD_INTCHG_AMT
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'C'
AND A.CTD_CR_AMT = 0
THEN 0
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'C'
AND A.CTD_CR_AMT <> 0
THEN (B.BT_CR_AMT / A.CTD_CR_AMT) * A.CTD_INTCHG_AMT
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'D'
AND A.CTD_DB_AMT = 0
THEN 0
WHEN C.INTCHG_AMT_APL_TYP_CDE = 'D'
AND A.CTD_DB_AMT <> 0
THEN (B.BT_DR_AMT / A.CTD_DB_AMT) * A.CTD_INTCHG_AMT
ELSE 0
END)
END, 6) BAT_PRD_INTCHG_AMT,
B.BT_DR_AMT,
B.BT_CR_AMT,
B.BT_DR_NUM,
B.BT_CR_NUM,
CTD_FEE_DSCNT_AMT,
CTD_FEE_PITM_AMT,
CTD_INTCHG_AMT,
CTD_FEE_AMT,
SUM (b.BT_DR_AMT) OVER (PARTITION BY a.MNO, a.CDNO, a.CGNO, a.CTD_DB_AMT, a.CTD_CR_AMT) AS S_BT_DR_AMT,
SUM (b.BT_CR_AMT) OVER (PARTITION BY a.MNO, a.CDNO, a.CGNO, a.CTD_DB_AMT, a.CTD_CR_AMT) AS S_BT_CR_AMT,
'N' AS RCLS_FLG,
C.DAC,
C.PAC,
C.INTCHG_AMT_APL_TYP_CDE,
C.INTCHG_PCT_APL_TYP_CDE,
C.PRD_ASSMNT_AT_CDE,
C.PRD_ASSMNT_PITM_AT_CDE
FROM MP.MALL A,
MAL_BAL B,
APL_CD C
WHERE A.DATE = B.DATE
AND A.MNO = B.MNO
AND A.CDNO = B.CDNO
AND A.CGNO = B.CGNO
AND B.DATE = C.DATE(+)
AND B.MNO = C.MNO(+)
AND B.CDNO = C.CDNO(+)
AND B.CGNO = C.CGNO(+)
AND B.BRT = C.BRT(+)
AND B.BRTD = C.BRTD(+)
AND A.BILL_TYP = 'MD'
AND A.CPT_ID NOT LIKE '%CF%'
AND A.DATE = TO_DATE ('20170131', 'YYYYMMDD')
AND A.CPT_ID NOT LIKE 'BTCH'
)
--AND A.CLNO NOT IN (5, 6)),
SELECT A.DATE,
A.CDNO,
A.CGNO,
A.MNO,
A.BRT,
A.BRTD,
A.BDR,
A.CLNO,
A.CPT_ID,
A.DAC DACE,
A.PAC DSCNT_PACE,
A.INTCHG_PCT_APL_TYP_CDE,
A.INTCHG_AMT_APL_TYP_CDE,
A.PRD_ASSMNT_AT_CDE,
A.PRD_ASSMNT_PITM_AT_CDE,
A.BT_DR_AMT BP_DB_AMT,
A.BT_CR_AMT BP_CR_AMT,
A.BT_DR_NUM BP_DB_NUM,
A.BT_CR_NUM BP_CR_NUM,
A.BP_FEE_DSCNT_AMT,
A.BP_FEE_PITM_AMT,
A.BP_INTCHG_AMT,
NVL (B.BP_FEE_ASSMNT_AMT, 0) BP_FEE_ASSMNT_AMT,
NVL (B.BP_ASSMNT_PITM_AMT, 0) BP_ASSMNT_PITM_AMT,
NVL (B.BP_ASSMNT_AMT, 0) BP_ASSMNT_AMT,
NVL (B.CONVNCE_FEE, 0) CONVNCE_FEE,
NVL (B.SURCHG_AMT, 0) SURCHG_AMT,
NVL (B.PHRESIA_AMT, 0) PHRESIA_AMT,
NVL (B.DCC_RBT_AMT, 0) DCC_RBT_AMT,
A.RCLS_FLG RLCS_FLG
FROM MAL_BAL_MALL A
LEFT OUTER JOIN ABC.BBA B
ON A.DATE = B.DATE
AND A.MNO = B.MNO
AND A.CDNO = B.CDNO
AND A.CGNO = B.CGNO
AND A.BRT = B.BRT
AND A.BRTD = B.BRTD
WHERE CTD_DB_AMT = S_BT_DR_AMT
AND CTD_CR_AMT = S_BT_CR_AMT;
注意：BBA 表有完整的访问计划（我正在研究它的索引），除此之外，如果需要任何其他更改，请告诉我。
执行计划
Plan hash value: 489280008
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 437 | 643 (1)| 00:00:02 | | | | | |
| 1 | TEMP TABLE TRANSFORMATION | | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10000 | | | | | | | Q1,00 | P->S | QC (RAND) |
| 4 | LOAD AS SELECT | SYS_TEMP_0FD9D9682_9E3FE5C2 | | | | | | | Q1,00 | PCWP | |
| 5 | NESTED LOOPS | | | | | | | | Q1,00 | PCWP | |
| 6 | NESTED LOOPS | | 1 | 111 | 633 (1)| 00:00:02 | | | Q1,00 | PCWP | |
| 7 | PX BLOCK ITERATOR | | 1 | 65 | 631 (1)| 00:00:02 | 1 | 4 | Q1,00 | PCWC | |
|* 8 | TABLE ACCESS STORAGE FULL | POST | 1 | 65 | 631 (1)| 00:00:02 | 1 |1048575| Q1,00 | PCWP | |
| 9 | PARTITION RANGE AND | | 1 | | 1 (0)| 00:00:01 |KEY(AP)|KEY(AP)| Q1,00 | PCWP | |
|* 10 | INDEX RANGE SCAN | BALL_PK | 1 | | 1 (0)| 00:00:01 |KEY(AP)|KEY(AP)| Q1,00 | PCWP | |
| 11 | TABLE ACCESS BY LOCAL INDEX ROWID | BALL | 1 | 46 | 2 (0)| 00:00:01 | 1 | 1 | Q1,00 | PCWP | |
| 12 | PX COORDINATOR | | | | | | | | | | |
| 13 | PX SEND QC (RANDOM) | :TQ20004 | 1 | 437 | 11 (19)| 00:00:01 | | | Q2,04 | P->S | QC (RAND) |
|* 14 | HASH JOIN OUTER | | 1 | 437 | 11 (19)| 00:00:01 | | | Q2,04 | PCWP | |
|* 15 | VIEW | | 1 | 276 | 8 (13)| 00:00:01 | | | Q2,04 | PCWP | |
| 16 | WINDOW SORT | | 1 | 397 | 8 (13)| 00:00:01 | | | Q2,04 | PCWP | |
| 17 | PX RECEIVE | | 1 | 397 | 7 (0)| 00:00:01 | | | Q2,04 | PCWP | |
| 18 | PX SEND HASH | :TQ20002 | 1 | 397 | 7 (0)| 00:00:01 | | | Q2,02 | P->P | HASH |
|* 19 | HASH JOIN OUTER BUFFERED | | 1 | 397 | 7 (0)| 00:00:01 | | | Q2,02 | PCWP | |
| 20 | PX RECEIVE | | | | | | | | Q2,02 | PCWP | |
| 21 | PX SEND HASH | :TQ20000 | | | | | | | Q2,00 | P->P | HASH |
| 22 | NESTED LOOPS | | | | | | | | Q2,00 | PCWP | |
| 23 | NESTED LOOPS | | 1 | 303 | 3 (0)| 00:00:01 | | | Q2,00 | PCWP | |
|* 24 | VIEW | | 1 | 135 | 2 (0)| 00:00:01 | | | Q2,00 | PCWP | |
| 25 | PX BLOCK ITERATOR | | 1 | 89 | 2 (0)| 00:00:01 | | | Q2,00 | PCWC | |
| 26 | TABLE ACCESS STORAGE FULL | SYS_TEMP_0FD9D9682_9E3FE5C2 | 1 | 89 | 2 (0)| 00:00:01 | | | Q2,00 | PCWP | |
| 27 | PARTITION RANGE SINGLE | | 1 | | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,00 | PCWP | |
|* 28 | INDEX UNIQUE SCAN | MALL_PK | 1 | | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,00 | PCWP | |
|* 29 | TABLE ACCESS BY LOCAL INDEX ROWID | MALL | 1 | 168 | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,00 | PCWP | |
| 30 | PX RECEIVE | | 1 | 94 | 4 (0)| 00:00:01 | | | Q2,02 | PCWP | |
| 31 | PX SEND HASH | :TQ20001 | 1 | 94 | 4 (0)| 00:00:01 | | | Q2,01 | P->P | HASH |
| 32 | VIEW | | 1 | 94 | 4 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 33 | NESTED LOOPS OUTER | | 1 | 228 | 4 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 34 | NESTED LOOPS OUTER | | 1 | 183 | 3 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 35 | VIEW | | 1 | 164 | 3 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 36 | NESTED LOOPS OUTER | | 1 | 217 | 3 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 37 | NESTED LOOPS | | 1 | 205 | 3 (0)| 00:00:01 | | | Q2,01 | PCWP | |
|* 38 | VIEW | | 1 | 70 | 2 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 39 | PX BLOCK ITERATOR | | 1 | 89 | 2 (0)| 00:00:01 | | | Q2,01 | PCWC | |
| 40 | TABLE ACCESS STORAGE FULL | SYS_TEMP_0FD9D9682_9E3FE5C2 | 1 | 89 | 2 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 41 | PARTITION RANGE SINGLE | | 1 | 135 | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,01 | PCWP | |
| 42 | TABLE ACCESS BY LOCAL INDEX ROWID| MALL | 1 | 135 | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,01 | PCWP | |
|* 43 | INDEX UNIQUE SCAN | MALL_PK | 1 | | 1 (0)| 00:00:01 | 2774 | 2774 | Q2,01 | PCWP | |
| 44 | TABLE ACCESS BY INDEX ROWID | M_T1 | 1 | 12 | 1 (0)| 00:00:01 | | | Q2,01 | PCWP | |
|* 45 | INDEX UNIQUE SCAN | M_T1_PK | 1 | | 1 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 46 | TABLE ACCESS BY INDEX ROWID | P_T1 | 1 | 19 | 0 (0)| 00:00:01 | | | Q2,01 | PCWP | |
|* 47 | INDEX UNIQUE SCAN | P_T1_PK | 1 | | 0 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 48 | TABLE ACCESS BY INDEX ROWID | N_T1 | 1 | 45 | 1 (0)| 00:00:01 | | | Q2,01 | PCWP | |
|* 49 | INDEX UNIQUE SCAN | N_PK | 1 | | 1 (0)| 00:00:01 | | | Q2,01 | PCWP | |
| 50 | BUFFER SORT | | | | | | | | Q2,04 | PCWC | |
| 51 | PX RECEIVE | | 1 | 161 | 2 (0)| 00:00:01 | | | Q2,04 | PCWP | |
| 52 | PX SEND BROADCAST | :TQ20003 | 1 | 161 | 2 (0)| 00:00:01 | | | Q2,03 | P->P | BROADCAST |
| 53 | PX BLOCK ITERATOR | | 1 | 161 | 2 (0)| 00:00:01 | | | Q2,03 | PCWC | |
| 54 | TABLE ACCESS STORAGE FULL | BBA | 1 | 161 | 2 (0)| 00:00:01 | | | Q2,03 | PCWP | |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
8 - filter("A"."DATE"=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "A"."BRTD"<=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd
hh24:mi:ss') AND "A"."BAT_DPST_TYP_CDE"<>'S' AND "A"."BAT_DPST_TYP_CDE"<>'V' AND "A"."BRTD">=TO_DATE(' 2016-12-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
10 - access("B"."PRCS_CENTRE_CDE"='NA' AND "A"."BRT"="B"."BRT" AND "A"."BRTD"="B"."BRTD")
filter("B"."BRTD"<=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "B"."BRTD">=TO_DATE(' 2016-12-01 00:00:00', 'syyyy-mm-dd
hh24:mi:ss') AND "A"."BRTD"="B"."BRTD")
14 - access("J"."BRTD"="B"."BRTD"(+) AND "J"."BRT"="B"."BRT"(+) AND "J"."CGNO"="B"."CGNO"(+) AND "J"."CDNO"="B"."CDNO"(+) AND
"J"."MRNO"="B"."MRNO"(+) AND "J"."DATE"="B"."DATE"(+))
15 - filter("CTD_DB_AMT"="S_BT_DR_AMT" AND "CTD_CR_AMT"="S_BT_CR_AMT")
19 - access("B"."DATE"="C"."DATE"(+) AND "B"."MRNO"="C"."MRNO"(+) AND "B"."CDNO"="C"."CDNO"(+) AND "B"."CGNO"="C"."CGNO"(+) AND
"B"."BRT"="C"."BRT"(+) AND "B"."BRTD"="C"."BRTD"(+))
24 - filter("B"."DATE"=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
28 - access("A"."DATE"=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "A"."BILL_TYP"='MD' AND "A"."CDNO"="B"."CDNO" AND
"A"."CGNO"="B"."CGNO" AND "A"."MRNO"="B"."MRNO")
29 - filter("A"."CPT_ID" NOT LIKE '%CF%' AND "A"."CPT_ID"<>'BTCH')
38 - filter("B"."DATE"=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
43 - access("AA"."DATE"=TO_DATE(' 2017-01-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "AA"."BILL_TYP"='MD' AND "AA"."CDNO"="B"."CDNO" AND
"AA"."CGNO"="B"."CGNO" AND "AA"."MRNO"="B"."MRNO")
45 - access("AA"."MRNO"="BB"."MRNO"(+))
47 - access("from$_subquery$_008"."CLG_NUM"="DD"."CLG_CF_NUM"(+) AND "from$_subquery$_008"."QCSJ_C000000000600004"="DD"."CDNO"(+) AND
"from$_subquery$_008"."QCSJ_C000000000600006"="DD"."CGNO"(+))
49 - access("AA"."CLNO"="CC"."CLG_CF_NUM"(+) AND "BB"."PMF_NPP_NUM"="CC"."NPP_NUM"(+) AND "AA"."CDNO"="CC"."CDNO"(+) AND "AA"."CGNO"="CC"."CGNO"(+))
Note
-----
- dynamic sampling used for this statement (level=5)
- Degree of Parallelism is 2 because of hint
【问题讨论】：
你在说什么“低于 SQL 查询”？ 您使用的是哪个 dbms？ 为什么需要优化它？它是否运行缓慢，如果是，需要多长时间以及表中有多少数据？您是否收集了有关表格的统计信息？解释计划中有很多Rows = 1，这通常是统计数据过时或缺失的标志。
【参考方案1】：
解决 SQL 查询问题的第一步是简单地删除所有
优化器提示（在您的情况下为PARALLEL）并重新运行查询以查看提示是否没有导致
性能问题。
基本上，在不了解基本机制和含义的情况下对单个查询进行故障排除的可能性非常有限 执行计划的操作。
幸运的是，网络上有大量可用资源。
我建议使用DBMS_SQLTUNE.REPORT_SQL_MONITOR 观察查询的执行情况
您将了解在哪里，即在哪个操作中消耗了数据库时间以及优化如何准确估计肉体 （通过实际行数和估计行数的差异）。
为了解决问题，您还可以尝试简化查询（检查其他人在 SO 上发布的查询有多少行），以便提高性能 问题依然存在。
【讨论】：
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