我对SQL很新，对我一直在研究的查询有点不了解。我需要优化下面的SQL查询。任何人都可以建议如何优化以下查询＆amp;它的效率。
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（我正在处理它的索引），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
答案 0 :(得分：0)
对SQL查询进行故障排除的一个简单步骤是简单地删除所有
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未导致
性能问题。
基本上，在不知道至少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。 执行计划的运作。
幸运的是，网络上有大量资源。
我建议用DBMS_SQLTUNE.REPORT_SQL_MONITOR
观察查询的执行情况你会知道哪里，即在哪个操作中消耗数据库时间以及如何优化估计肉体 （通过实际行和估计行的差异）。
为了解决问题，您也可以尝试简化查询（检查有多少行有其他人在SO 上发布的查询），以便提高性能 问题依然存在