优化 Oracle SQL 查询
Optimize Oracle SQL query
Oracle SQL 性能调优
有人可以帮我优化这个查询吗？
（请注意，我在 select 语句中有多个子查询，为了方便起见，我在这里只提供 2 个子查询）。
我已经在此处提供了解释计划，并将添加 table 的详细信息。
（这是我将SQL服务器DTS包转换成Oracle Procedure的情况。所以，所有table都是我创建的，几乎没有索引。）
SELECT dlr.PK_DealerCode_vc,
dlr.DealerNameShort_vc,
CASE WHEN mmacode_vc = '' THEN Province_vc
ELSE '' END,
dlr.AREAName_vc,
dlr.MMAName_vc,
gmma.GMMAName_vc,
ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
NVL((SELECT SUM(VehicleCount_in)
FROM VehicleCountByDA b
INNER JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4
AND TRIM(a.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
AND gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK'), 0) "CarIndY - 4",
NVL((SELECT SUM(VehicleCount_in)
FROM VehicleCountByDA b
INNER JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3
AND TRIM(a.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
AND gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK'), 0) "CarIndY - 3"
FROM DealerFile dlr,
(SELECT DISTINCT PK_DealerCode_vc,
GMMAName_vc
FROM DealerGuideFile) gmma
WHERE ((nvl(dlr.ChevFranchise_bt, 0) = 1
AND nvl(dlr.PBGFranchise_bt, 0) = 0))
AND StatusName_vc = 'Active'
AND TRIM(dlr.PK_DealerCode_vc) = TRIM(gmma.PK_DealerCode_vc)
AND DealerName_vc NOT LIKE ('%Study Area%')
AND DealerName_vc NOT LIKE ('%Open Point%')
AND DealerName_vc NOT LIKE ('%Branch%')
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc)) <= 5;
此处附有说明计划声明：
Plan hash value: 37211997
-----------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 13 | 1781 | 142K (2)| 00:00:12 |
| 1 | SORT AGGREGATE | | 1 | 55 | | |
|* 2 | HASH JOIN | | 2833 | 152K| 23748 (2)| 00:00:02 |
|* 3 | TABLE ACCESS FULL | GMSQLDBDOMESTICGEOGRAPHYDATA | 539 | 8085 | 1020 (1)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | GM_TEMP_VEHICLECOUNTBYDA | 525 | 21000 | 22728 (2)| 00:00:02 |
| 5 | SORT AGGREGATE | | 1 | 55 | | |
|* 6 | HASH JOIN | | 2833 | 152K| 23748 (2)| 00:00:02 |
|* 7 | TABLE ACCESS FULL | GMSQLDBDOMESTICGEOGRAPHYDATA | 539 | 8085 | 1020 (1)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | GM_TEMP_VEHICLECOUNTBYDA | 525 | 21000 | 22728 (2)| 00:00:02 |
| 9 | VIEW | VM_NWVW_1 | 13 | 1781 | 16 (7)| 00:00:01 |
| 10 | HASH UNIQUE | | 13 | 1898 | 16 (7)| 00:00:01 |
|* 11 | HASH JOIN | | 13 | 1898 | 15 (0)| 00:00:01 |
|* 12 | TABLE ACCESS FULL| GMSQLDBGMDEALERFILE | 3 | 342 | 10 (0)| 00:00:01 |
| 13 | TABLE ACCESS FULL| MAEDEALERGUIDEFILE | 511 | 16352 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SELC51A37
3 - SELC51A37 / A@SEL
4 - SELC51A37 / B@SEL
5 - SELB10B79
7 - SELB10B79 / A@SEL
8 - SELB10B79 / B@SEL
9 - SELE77572C / VM_NWVW_1@SEL$A5893905
10 - SELE77572C
12 - SELE77572C / DLR@SEL
13 - SELE77572C / MAEDEALERGUIDEFILE@SEL
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(TRIM("A"."PK_DA_VC")=TRIM("B"."PK_DA_VC"))
3 - filter(TRIM("A"."COCMACODE_VC")=TRIM(:B1))
4 - filter(2020-"B"."REPORTYEAR_IN"=4 AND TRIM("B"."GMCUSTOMWEIGHTGROUPNAME_VC")='NON-TRUC
K' AND "B"."GMPRIMARYCODE_VC"='R')
6 - access(TRIM("A"."PK_DA_VC")=TRIM("B"."PK_DA_VC"))
7 - filter(TRIM("A"."COCMACODE_VC")=TRIM(:B1))
8 - filter(2020-"B"."REPORTYEAR_IN"=3 AND TRIM("B"."GMCUSTOMWEIGHTGROUPNAME_VC")='NON-TRUC
K' AND "B"."GMPRIMARYCODE_VC"='R')
11 - access(TRIM("DLR"."PK_DEALERCODE_VC")=TRIM("PK_DEALERCODE_VC"))
12 - filter(NVL("DLR"."PBGFRANCHISE_BT",0)=0 AND
LENGTH(RTRIM("DLR"."PK_DEALERCODE_VC"))<=5 AND "STATUSNAME_VC"='Active' AND "DEALERNAME_VC"
NOT LIKE '%Study Area%' AND "DEALERNAME_VC" NOT LIKE '%Open Point%' AND "DEALERNAME_VC" NOT
LIKE '%Branch%' AND NVL("DLR"."CHEVFRANCHISE_BT",0)=1 AND "DEALERNAME_VC" IS NOT NULL AND
"DEALERNAME_VC" IS NOT NULL AND "DEALERNAME_VC" IS NOT NULL)
Column Projection Information (identified by operation id):
-----------------------------------------------------------
1 - (#keys=0) SUM("B"."VEHICLECOUNT_IN")[22]
2 - (#keys=1; rowset=256) "B"."VEHICLECOUNT_IN"[NUMBER,22]
3 - (rowset=256) "A"."PK_DA_VC"[VARCHAR2,8]
4 - (rowset=256) "B"."PK_DA_VC"[VARCHAR2,10], "B"."VEHICLECOUNT_IN"[NUMBER,22]
5 - (#keys=0) SUM("B"."VEHICLECOUNT_IN")[22]
6 - (#keys=1; rowset=256) "B"."VEHICLECOUNT_IN"[NUMBER,22]
7 - (rowset=256) "A"."PK_DA_VC"[VARCHAR2,8]
8 - (rowset=256) "B"."PK_DA_VC"[VARCHAR2,10], "B"."VEHICLECOUNT_IN"[NUMBER,22]
9 - "$vm_col_3"[VARCHAR2,100], "$vm_col_4"[VARCHAR2,2], "$vm_col_5"[VARCHAR2,4],
"$vm_col_6"[VARCHAR2,50], "$vm_col_7"[VARCHAR2,25], "$vm_col_8"[VARCHAR2,30],
"$vm_col_9"[VARCHAR2,25], "$vm_col_10"[VARCHAR2,8]
10 - (#keys=11) ROWID[ROWID,10], "GMMANAME_VC"[VARCHAR2,30],
"PK_DEALERCODE_VC"[VARCHAR2,8], "DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100],
"PROVINCE_VC"[VARCHAR2,2], "MMACODE_VC"[VARCHAR2,4], "DLR"."AREANAME_VC"[VARCHAR2,50],
"DLR"."MMANAME_VC"[VARCHAR2,25], "GMMANAME_VC"[VARCHAR2,30], "ZONENAME_VC"[VARCHAR2,25],
"DLR"."PK_DEALERCODE_VC"[VARCHAR2,8]
11 - (#keys=1) ROWID[ROWID,10], "DLR"."PK_DEALERCODE_VC"[VARCHAR2,8],
"DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100], "PROVINCE_VC"[VARCHAR2,2],
"ZONENAME_VC"[VARCHAR2,25], "MMACODE_VC"[VARCHAR2,4], "DLR"."MMANAME_VC"[VARCHAR2,25],
"DLR"."AREANAME_VC"[VARCHAR2,50], "PK_DEALERCODE_VC"[VARCHAR2,8], "GMMANAME_VC"[VARCHAR2,30]
12 - (rowset=256) ROWID[ROWID,10], "DLR"."PK_DEALERCODE_VC"[VARCHAR2,8],
"DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100], "PROVINCE_VC"[VARCHAR2,2],
"ZONENAME_VC"[VARCHAR2,25], "MMACODE_VC"[VARCHAR2,4], "DLR"."MMANAME_VC"[VARCHAR2,25],
"DLR"."AREANAME_VC"[VARCHAR2,50]
13 - (rowset=256) "PK_DEALERCODE_VC"[VARCHAR2,8], "GMMANAME_VC"[VARCHAR2,30]
CREATE TABLE GMSQLDBDomesticGeographyData (
PK_DA_vc Varchar2(8) NOT NULL ,
FSA_vc Varchar2(3) NULL ,
FSAName_vc Varchar2(100) NULL ,
COCMACode_vc Varchar2(5) NULL ,
COCMAName_vc Varchar2(50) NULL ,
PBGMACode_vc Varchar2(5) NULL ,
PBGMAName_vc Varchar2(50) NULL ,
CADMACode_vc Varchar2(5) NULL ,
CADMAName_vc Varchar2(50) NULL ,
HUMMACode_vc Varchar2(5) NULL ,
HUMMAName_vc Varchar2(50) NULL ,
MDMACode_vc Varchar2(5) NULL ,
MDMAName_vc Varchar2(50) NULL ,
DomesticMMACode_vc Varchar2(4) NULL ,
DomesticMMAName_vc Varchar2(25) NULL ,
ProvinceCode_vc Varchar2(2) NULL ,
ProvinceName_vc Varchar2(50) NULL ,
ReportTerritoryCode_vc Varchar2(2) NULL ,
ReportTerritoryName_vc Varchar2(50) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMAName_vc Varchar2(30) NULL ,
AREACode_vc Varchar2(5) NULL ,
AREAName_vc Varchar2(50) NULL ,
OntarioSpecialMarket_vc Varchar2(50) NULL ,
CONSTRAINT PK_GMSQLDBDomesticGeographyData PRIMARY KEY
(
PK_DA_vc
)
);
CREATE TABLE GM_TEMP_VehicleCountByDA (
PK_DA_vc Varchar2(10) NULL ,
VehicleCount_in Number(10) NULL ,
ReportYear_in Number(10) NULL ,
ReportMonth_in Number(10) NULL ,
gmcustomtypecode_vc Varchar2(100) NULL ,
GMCustomDetailedSegmentCode_vc Varchar2(100) NULL ,
gmcustomweightgroupname_vc Varchar2(100) NULL ,
gmcustomeManufacturername_vc Varchar2(50) NULL ,
genericmanufacturername_vc Varchar2(50) NULL ,
GMPrimaryCode_vc Varchar2(1) NULL ,
makedescription_vc Varchar2(50) NULL ,
GMCustomImportDomesticName_vc Varchar2(30) NULL
);
CREATE TABLE MAEDealerGuideFile (
PK_DealerCode_vc Varchar2(8) NOT NULL ,
StatusCode_vc Varchar2(1) NOT NULL ,
OPFlag_vc Varchar2(1) NULL ,
StatusName_vc Varchar2(15) NULL ,
DealerName_vc Varchar2(100) NULL ,
DealerNameShort_vc Varchar2(100) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
SalesTerritoryCode_vc Varchar2(2) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMAName_vc Varchar2(30) NULL ,
GMMALevelCode_vc Varchar2(1) NULL ,
GMMAGroupKey Number(10) DEFAULT (0) NULL ,
OutOfVolume Number(10) DEFAULT (0) NULL ,
Rank Number(10) DEFAULT (0) NULL ,
MMACode_vc Varchar2(4) NULL ,
MMAName_vc Varchar2(25) NULL ,
NationalCode_vc Varchar2(3) DEFAULT ('NAT') NULL ,
NationalName_vc Varchar2(8) DEFAULT ('NATIONAL') NULL ,
NationalAssignedCode_vc Varchar2(1) DEFAULT ('A') NULL ,
NationalAssignedName_vc Varchar2(10) DEFAULT ('ASSIGNED') NULL ,
ReplacedByDealerCode_vc Varchar2(20) NULL ,
ReplacingDealerCode_vc Varchar2(20) NULL ,
FranchiseCodes_vc Varchar2(15) NULL ,
FranchisesCarried Varchar2(30) DEFAULT (' ') NULL ,
FranchisesCarried4Print Varchar2(30) DEFAULT (' ') NULL ,
Chevrolet Varchar2(1) NOT NULL ,
PBG Varchar2(1) NOT NULL ,
Cadillac Varchar2(1) NOT NULL ,
Hummer Varchar2(1) NOT NULL ,
Saturn Varchar2(1) NOT NULL ,
Saab Varchar2(1) NOT NULL ,
Isuzu Varchar2(1) NOT NULL ,
AreaName_vc Varchar2(50) NULL ,
CityCode_vc Varchar2(2) NULL ,
MACode_vc Varchar2(5) NULL ,
MAName_vc Varchar2(20) NULL ,
DealerBACCode_vc Varchar2(11) NULL
);
CREATE TABLE GMSQLDBGMDealerFile (
PK_DealerCode_vc Varchar2(8) NOT NULL ,
StatusCode_vc Varchar2(1) NULL ,
StatusName_vc Varchar2(15) NULL ,
OPFlag_vc Varchar2(1) NULL ,
BusFranchiseFlag_vc Varchar2(1) NULL ,
Language_vc Varchar2(1) NULL ,
FrenchFlag_vc Varchar2(1) NULL ,
DealerName_vc Varchar2(100) NULL ,
DealerNameShort_vc Varchar2(100) NULL ,
Address_vc Varchar2(50) NULL ,
POBox_vc Varchar2(50) NULL ,
City_vc Varchar2(30) NULL ,
Province_vc Varchar2(2) NULL ,
FSALDU_vc Varchar2(7) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
EWCode_vc Varchar2(1) NULL ,
EWName_vc Varchar2(4) NOT NULL ,
FranchiseCodes_vc Varchar2(15) NULL ,
ChevFranchise_bt Number(1) NULL ,
PBGFranchise_bt Number(1) NULL ,
CadFranchise_bt Number(1) NULL ,
HumFranchise_bt Number(1) NULL ,
SatFranchise_bt Number(1) NULL ,
SaabFranchise_bt Number(1) NULL ,
IsuzuFranchise_bt Number(1) NULL ,
SalesTerritoryCode_vc Varchar2(2) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMALevelCode_vc Varchar2(1) NULL ,
MMACode_vc Varchar2(4) NULL ,
MMAName_vc Varchar2(25) NULL ,
TerminationDate_d Varchar2(11) NULL ,
ReplacingDealercode_vc Varchar2(20) NULL ,
ReplacedByDealerCode_vc Varchar2(20) NULL ,
ServiceTerritoryCode_vc Varchar2(2) NULL ,
AreaName_vc Varchar2(50) NULL ,
CityCode_vc Varchar2(2) NULL ,
MACode_vc Varchar2(5) NULL ,
MAName_vc Varchar2(20) NULL ,
DealerBACCode_vc Varchar2(11) NULL
);
列的基数：
TABLE_NAME COLUMN_NAME NUM_DISTINCT
GM_TEMP_VEHICLECOUNTBYDA PK_DA_VC 54936
GM_TEMP_VEHICLECOUNTBYDA VEHICLECOUNT_IN 660
GM_TEMP_VEHICLECOUNTBYDA REPORTYEAR_IN 6
GM_TEMP_VEHICLECOUNTBYDA REPORTMONTH_IN 2
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMTYPECODE_VC 2
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMDETAILEDSEGMENTCODE_VC 72
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMWEIGHTGROUPNAME_VC 4
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMEMANUFACTURERNAME_VC 47
GM_TEMP_VEHICLECOUNTBYDA GENERICMANUFACTURERNAME_VC 48
GM_TEMP_VEHICLECOUNTBYDA GMPRIMARYCODE_VC 3
GM_TEMP_VEHICLECOUNTBYDA MAKEDESCRIPTION_VC 71
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMIMPORTDOMESTICNAME_VC 2
MAEDEALERGUIDEFILE PK_DEALERCODE_VC 511
MAEDEALERGUIDEFILE STATUSCODE_VC 4
MAEDEALERGUIDEFILE OPFLAG_VC 2
MAEDEALERGUIDEFILE STATUSNAME_VC 2
MAEDEALERGUIDEFILE DEALERNAME_VC 502
MAEDEALERGUIDEFILE DEALERNAMESHORT_VC 509
MAEDEALERGUIDEFILE ZONECODE_VC 3
MAEDEALERGUIDEFILE ZONENAME_VC 3
MAEDEALERGUIDEFILE SALESTERRITORYCODE_VC 14
MAEDEALERGUIDEFILE GMMACODE_VC 7
MAEDEALERGUIDEFILE GMMANAME_VC 7
MAEDEALERGUIDEFILE GMMALEVELCODE_VC 9
MAEDEALERGUIDEFILE GMMAGROUPKEY 39
MAEDEALERGUIDEFILE OUTOFVOLUME 24
MAEDEALERGUIDEFILE RANK 1
MAEDEALERGUIDEFILE MMACODE_VC 20
MAEDEALERGUIDEFILE MMANAME_VC 20
MAEDEALERGUIDEFILE NATIONALCODE_VC 1
MAEDEALERGUIDEFILE NATIONALNAME_VC 1
MAEDEALERGUIDEFILE NATIONALASSIGNEDCODE_VC 1
MAEDEALERGUIDEFILE NATIONALASSIGNEDNAME_VC 1
MAEDEALERGUIDEFILE REPLACEDBYDEALERCODE_VC 0
MAEDEALERGUIDEFILE REPLACINGDEALERCODE_VC 279
MAEDEALERGUIDEFILE FRANCHISECODES_VC 88
MAEDEALERGUIDEFILE FRANCHISESCARRIED 7
MAEDEALERGUIDEFILE FRANCHISESCARRIED4PRINT 7
MAEDEALERGUIDEFILE CHEVROLET 2
MAEDEALERGUIDEFILE PBG 2
MAEDEALERGUIDEFILE CADILLAC 2
MAEDEALERGUIDEFILE HUMMER 1
MAEDEALERGUIDEFILE SATURN 1
MAEDEALERGUIDEFILE SAAB 1
MAEDEALERGUIDEFILE ISUZU 1
MAEDEALERGUIDEFILE AREANAME_VC 464
MAEDEALERGUIDEFILE CITYCODE_VC 3
MAEDEALERGUIDEFILE MACODE_VC 3
MAEDEALERGUIDEFILE MANAME_VC 2
MAEDEALERGUIDEFILE DEALERBACCODE_VC 448
GMSQLDBGMDEALERFILE PK_DEALERCODE_VC 556
GMSQLDBGMDEALERFILE STATUSCODE_VC 3
GMSQLDBGMDEALERFILE STATUSNAME_VC 3
GMSQLDBGMDEALERFILE OPFLAG_VC 2
GMSQLDBGMDEALERFILE BUSFRANCHISEFLAG_VC 0
GMSQLDBGMDEALERFILE LANGUAGE_VC 2
GMSQLDBGMDEALERFILE FRENCHFLAG_VC 0
GMSQLDBGMDEALERFILE DEALERNAME_VC 546
GMSQLDBGMDEALERFILE DEALERNAMESHORT_VC 550
GMSQLDBGMDEALERFILE ADDRESS_VC 469
GMSQLDBGMDEALERFILE POBOX_VC 130
GMSQLDBGMDEALERFILE CITY_VC 426
GMSQLDBGMDEALERFILE PROVINCE_VC 13
GMSQLDBGMDEALERFILE FSALDU_VC 468
GMSQLDBGMDEALERFILE ZONECODE_VC 3
GMSQLDBGMDEALERFILE ZONENAME_VC 3
GMSQLDBGMDEALERFILE EWCODE_VC 0
GMSQLDBGMDEALERFILE EWNAME_VC 0
GMSQLDBGMDEALERFILE FRANCHISECODES_VC 100
GMSQLDBGMDEALERFILE CHEVFRANCHISE_BT 2
GMSQLDBGMDEALERFILE PBGFRANCHISE_BT 2
GMSQLDBGMDEALERFILE CADFRANCHISE_BT 2
GMSQLDBGMDEALERFILE HUMFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SATFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SAABFRANCHISE_BT 1
GMSQLDBGMDEALERFILE ISUZUFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SALESTERRITORYCODE_VC 14
GMSQLDBGMDEALERFILE GMMACODE_VC 7
GMSQLDBGMDEALERFILE GMMALEVELCODE_VC 9
GMSQLDBGMDEALERFILE MMACODE_VC 20
GMSQLDBGMDEALERFILE MMANAME_VC 20
GMSQLDBGMDEALERFILE TERMINATIONDATE_D 1
GMSQLDBGMDEALERFILE REPLACINGDEALERCODE_VC 304
GMSQLDBGMDEALERFILE REPLACEDBYDEALERCODE_VC 23
GMSQLDBGMDEALERFILE SERVICETERRITORYCODE_VC 13
GMSQLDBGMDEALERFILE AREANAME_VC 468
GMSQLDBGMDEALERFILE CITYCODE_VC 3
GMSQLDBGMDEALERFILE MACODE_VC 3
GMSQLDBGMDEALERFILE MANAME_VC 2
GMSQLDBGMDEALERFILE DEALERBACCODE_VC 486
GMSQLDBDOMESTICGEOGRAPHYDATA PK_DA_VC 53941
GMSQLDBDOMESTICGEOGRAPHYDATA FSA_VC 1576
GMSQLDBDOMESTICGEOGRAPHYDATA FSANAME_VC 588
GMSQLDBDOMESTICGEOGRAPHYDATA COCMACODE_VC 438
GMSQLDBDOMESTICGEOGRAPHYDATA COCMANAME_VC 436
GMSQLDBDOMESTICGEOGRAPHYDATA PBGMACODE_VC 426
GMSQLDBDOMESTICGEOGRAPHYDATA PBGMANAME_VC 425
GMSQLDBDOMESTICGEOGRAPHYDATA CADMACODE_VC 126
GMSQLDBDOMESTICGEOGRAPHYDATA CADMANAME_VC 125
GMSQLDBDOMESTICGEOGRAPHYDATA HUMMACODE_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA HUMMANAME_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA MDMACODE_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA MDMANAME_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA DOMESTICMMACODE_VC 20
GMSQLDBDOMESTICGEOGRAPHYDATA DOMESTICMMANAME_VC 20
GMSQLDBDOMESTICGEOGRAPHYDATA PROVINCECODE_VC 12
GMSQLDBDOMESTICGEOGRAPHYDATA PROVINCENAME_VC 12
GMSQLDBDOMESTICGEOGRAPHYDATA REPORTTERRITORYCODE_VC 14
GMSQLDBDOMESTICGEOGRAPHYDATA REPORTTERRITORYNAME_VC 14
GMSQLDBDOMESTICGEOGRAPHYDATA ZONECODE_VC 3
GMSQLDBDOMESTICGEOGRAPHYDATA ZONENAME_VC 3
GMSQLDBDOMESTICGEOGRAPHYDATA GMMACODE_VC 7
GMSQLDBDOMESTICGEOGRAPHYDATA GMMANAME_VC 7
GMSQLDBDOMESTICGEOGRAPHYDATA AREACODE_VC 438
GMSQLDBDOMESTICGEOGRAPHYDATA AREANAME_VC 437
GMSQLDBDOMESTICGEOGRAPHYDATA ONTARIOSPECIALMARKET_VC 3
一些快速的建议 -
我看到您在每次加入时都使用 trim。建议尽可能不要这样做，至少对于基于主键的连接，例如 - TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc) 如果不是绝对必要的话.因为，默认情况下，主键在 oracle 中建立在它们之上的索引。如果你在连接时用函数包装它们，查询优化器将无法在连接时使用基于 pk 的索引，这会对你的查询性能产生负面影响。
关于获取“carIndy -4 & ..-3 etc..”的查询，你不需要每次都重复查询。在 select 中，只需使用 Sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 then VehicleCount_in else 0 end) as "CarIndY - 3", .... "CarIndY - 4" 在同一查询中并在连接中使用此查询而不是 select .由于这些本质上是计数，因此该子集只有一行包含您需要的所有列，因此您应该能够交叉连接它并获取主查询 select 中的所有 carIndY - n 列
此外，将主要连接条件放在过滤条件之前，例如在您的查询中您有 -
哪里 ((nvl(dlr.ChevFranchise_bt, 0) = 1
AND nvl(dlr.PBGFranchise_bt, 0) = 0))
和 StatusName_vc = 'Active'
AND TRIM(dlr.PK_DealerCode_vc) = TRIM(gmma.PK_DealerCode_vc)
这里，第 4 个 and 条件是主要的连接条件，应该在 where
中的其他条件之前首先提到它
由于没有索引，您可以尝试使用以下索引进行以下查询 -
SELECT dlr.PK_DealerCode_vc,
dlr.DealerNameShort_vc,
CASE WHEN mmacode_vc = '' THEN Province_vc
ELSE '' END,
dlr.AREAName_vc,
dlr.MMAName_vc,
gmma.GMMAName_vc,
ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
NVL(SUM(CASE WHEN (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4 THEN VehicleCount_in END), 0) "CarIndY - 4",
NVL(SUM(CASE WHEN (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 THEN VehicleCount_in END), 0) "CarIndY - 3"
FROM DealerFile dlr,
JOIN (SELECT DISTINCT PK_DealerCode_vc,
GMMAName_vc
FROM DealerGuideFile) gmma ON TRIM(dlr.PK_DealerCode_vc) =
TRIM(gmma.PK_DealerCode_vc)
JOIN (SELECT COCMACode_vc, VehicleCount_in, ReportYear_in
FROM VehicleCountByDA b
JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK') CarIndY ON TRIM(CARINDY.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
WHERE nvl(dlr.ChevFranchise_bt, 0) = 1
AND nvl(dlr.PBGFranchise_bt, 0) = 0
AND StatusName_vc = 'Active'
AND DealerName_vc NOT LIKE '%Study Area%'
AND DealerName_vc NOT LIKE '%Open Point%'
AND DealerName_vc NOT LIKE '%Branch%'
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc)) <= 5;
您可能在每个 table -
上有以下索引
DealerFile - TRIM(PK_DealerCode_vc), TRIM(PK_DealerCode_vc), nvl(ChevFranchise_bt, 0), nvl(PBGFranchise_bt, 0), LENGTH(RTRIM(PK_DealerCode_vc));
VehicleCountByDA - TRIM(PK_DA_vc);
DomesticGeographyData - TRIM(PK_DA_vc), TRIM(COCMACode_vc);
你的 'dates' 真的是 hard-coded 字符串，还是你这样做只是为了在这里发帖？ Hard-coding 这看起来很不切实际，所以我假设你这样做是为了演示..
这个结构在你的 SELECT
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
可以简化为
to_char(to_date('30-jun-2020','dd-mon-yyyy'),'mmyy')
和
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4
如果该日期没有硬编码，几乎肯定还有其他机会来改进您对日期的处理，但我们需要知道您在那里真正使用的是什么。
https://edstevensdba.wordpress.com/2011/04/07/nls_date_format/
正如@Somy 所建议的那样，一个简单的编辑将成本降低了 4 倍：
SELECT
-- DealerCode_vc varchar(6), DealerName_vc varchar(100), province_vc, MAName_vc varchar(25), MMAName_vc varchar(25), GMMAName_vc varchar(25), Zone_vc varchar(25), ReportPeriod_vc varchar(50),
dlr.PK_DealerCode_vc, dlr.DealerNameShort_vc,
case when mmacode_vc = '' then Province_vc else '' end province_vc,
dlr.AREAName_vc, dlr.MMAName_vc, gmma.GMMAName_vc, dlr.ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy') reportperiod_vc
-- CarIndY-4 int,
,NVL(sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4 then VehicleCount_in else 0 end ),0) "CarIndY-4"
-- CarIndY-3 int,
,NVL(sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 then VehicleCount_in else 0 end),0) "CarIndY-3"
FROM GMSQLDBGMDealerFile dlr,
(Select distinct PK_DealerCode_vc, GMMAName_vc from MAEDealerGuideFile) gmma,
GM_TEMP_VehicleCountByDA b,GMSQLDBDomesticGeographyData a
WHERE trim(dlr.PK_DealerCode_vc) = trim(gmma.PK_DealerCode_vc)
AND trim(a.COCMACode_vc) = trim(dlr.PK_DealerCode_vc)
and trim(a.PK_DA_vc) = trim(b.PK_DA_vc)
and ((nvl(dlr.ChevFranchise_bt,0) = 1 AND nvl(dlr.PBGFranchise_bt,0)=0))
AND StatusName_vc = 'Active'
AND DealerName_vc not like ('%Study Area%')
AND DealerName_vc not like ('%Open Point%')
AND DealerName_vc not like ('%Branch%')
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc))<=5
AND gmprimarycode_vc='R' and trim(gmcustomweightgroupname_vc) = 'NON-TRUCK'
group by dlr.PK_DealerCode_vc, dlr.DealerNameShort_vc,
case when mmacode_vc = '' then Province_vc else '' end ,
dlr.AREAName_vc, dlr.MMAName_vc, gmma.GMMAName_vc, dlr.ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy') ;
Oracle SQL 性能调优
有人可以帮我优化这个查询吗？ （请注意，我在 select 语句中有多个子查询，为了方便起见，我在这里只提供 2 个子查询）。
我已经在此处提供了解释计划，并将添加 table 的详细信息。
（这是我将SQL服务器DTS包转换成Oracle Procedure的情况。所以，所有table都是我创建的，几乎没有索引。）
SELECT dlr.PK_DealerCode_vc,
dlr.DealerNameShort_vc,
CASE WHEN mmacode_vc = '' THEN Province_vc
ELSE '' END,
dlr.AREAName_vc,
dlr.MMAName_vc,
gmma.GMMAName_vc,
ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
NVL((SELECT SUM(VehicleCount_in)
FROM VehicleCountByDA b
INNER JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4
AND TRIM(a.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
AND gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK'), 0) "CarIndY - 4",
NVL((SELECT SUM(VehicleCount_in)
FROM VehicleCountByDA b
INNER JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3
AND TRIM(a.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
AND gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK'), 0) "CarIndY - 3"
FROM DealerFile dlr,
(SELECT DISTINCT PK_DealerCode_vc,
GMMAName_vc
FROM DealerGuideFile) gmma
WHERE ((nvl(dlr.ChevFranchise_bt, 0) = 1
AND nvl(dlr.PBGFranchise_bt, 0) = 0))
AND StatusName_vc = 'Active'
AND TRIM(dlr.PK_DealerCode_vc) = TRIM(gmma.PK_DealerCode_vc)
AND DealerName_vc NOT LIKE ('%Study Area%')
AND DealerName_vc NOT LIKE ('%Open Point%')
AND DealerName_vc NOT LIKE ('%Branch%')
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc)) <= 5;
此处附有说明计划声明：
Plan hash value: 37211997
-----------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 13 | 1781 | 142K (2)| 00:00:12 |
| 1 | SORT AGGREGATE | | 1 | 55 | | |
|* 2 | HASH JOIN | | 2833 | 152K| 23748 (2)| 00:00:02 |
|* 3 | TABLE ACCESS FULL | GMSQLDBDOMESTICGEOGRAPHYDATA | 539 | 8085 | 1020 (1)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | GM_TEMP_VEHICLECOUNTBYDA | 525 | 21000 | 22728 (2)| 00:00:02 |
| 5 | SORT AGGREGATE | | 1 | 55 | | |
|* 6 | HASH JOIN | | 2833 | 152K| 23748 (2)| 00:00:02 |
|* 7 | TABLE ACCESS FULL | GMSQLDBDOMESTICGEOGRAPHYDATA | 539 | 8085 | 1020 (1)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | GM_TEMP_VEHICLECOUNTBYDA | 525 | 21000 | 22728 (2)| 00:00:02 |
| 9 | VIEW | VM_NWVW_1 | 13 | 1781 | 16 (7)| 00:00:01 |
| 10 | HASH UNIQUE | | 13 | 1898 | 16 (7)| 00:00:01 |
|* 11 | HASH JOIN | | 13 | 1898 | 15 (0)| 00:00:01 |
|* 12 | TABLE ACCESS FULL| GMSQLDBGMDEALERFILE | 3 | 342 | 10 (0)| 00:00:01 |
| 13 | TABLE ACCESS FULL| MAEDEALERGUIDEFILE | 511 | 16352 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SELC51A37
3 - SELC51A37 / A@SEL
4 - SELC51A37 / B@SEL
5 - SELB10B79
7 - SELB10B79 / A@SEL
8 - SELB10B79 / B@SEL
9 - SELE77572C / VM_NWVW_1@SEL$A5893905
10 - SELE77572C
12 - SELE77572C / DLR@SEL
13 - SELE77572C / MAEDEALERGUIDEFILE@SEL
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(TRIM("A"."PK_DA_VC")=TRIM("B"."PK_DA_VC"))
3 - filter(TRIM("A"."COCMACODE_VC")=TRIM(:B1))
4 - filter(2020-"B"."REPORTYEAR_IN"=4 AND TRIM("B"."GMCUSTOMWEIGHTGROUPNAME_VC")='NON-TRUC
K' AND "B"."GMPRIMARYCODE_VC"='R')
6 - access(TRIM("A"."PK_DA_VC")=TRIM("B"."PK_DA_VC"))
7 - filter(TRIM("A"."COCMACODE_VC")=TRIM(:B1))
8 - filter(2020-"B"."REPORTYEAR_IN"=3 AND TRIM("B"."GMCUSTOMWEIGHTGROUPNAME_VC")='NON-TRUC
K' AND "B"."GMPRIMARYCODE_VC"='R')
11 - access(TRIM("DLR"."PK_DEALERCODE_VC")=TRIM("PK_DEALERCODE_VC"))
12 - filter(NVL("DLR"."PBGFRANCHISE_BT",0)=0 AND
LENGTH(RTRIM("DLR"."PK_DEALERCODE_VC"))<=5 AND "STATUSNAME_VC"='Active' AND "DEALERNAME_VC"
NOT LIKE '%Study Area%' AND "DEALERNAME_VC" NOT LIKE '%Open Point%' AND "DEALERNAME_VC" NOT
LIKE '%Branch%' AND NVL("DLR"."CHEVFRANCHISE_BT",0)=1 AND "DEALERNAME_VC" IS NOT NULL AND
"DEALERNAME_VC" IS NOT NULL AND "DEALERNAME_VC" IS NOT NULL)
Column Projection Information (identified by operation id):
-----------------------------------------------------------
1 - (#keys=0) SUM("B"."VEHICLECOUNT_IN")[22]
2 - (#keys=1; rowset=256) "B"."VEHICLECOUNT_IN"[NUMBER,22]
3 - (rowset=256) "A"."PK_DA_VC"[VARCHAR2,8]
4 - (rowset=256) "B"."PK_DA_VC"[VARCHAR2,10], "B"."VEHICLECOUNT_IN"[NUMBER,22]
5 - (#keys=0) SUM("B"."VEHICLECOUNT_IN")[22]
6 - (#keys=1; rowset=256) "B"."VEHICLECOUNT_IN"[NUMBER,22]
7 - (rowset=256) "A"."PK_DA_VC"[VARCHAR2,8]
8 - (rowset=256) "B"."PK_DA_VC"[VARCHAR2,10], "B"."VEHICLECOUNT_IN"[NUMBER,22]
9 - "$vm_col_3"[VARCHAR2,100], "$vm_col_4"[VARCHAR2,2], "$vm_col_5"[VARCHAR2,4],
"$vm_col_6"[VARCHAR2,50], "$vm_col_7"[VARCHAR2,25], "$vm_col_8"[VARCHAR2,30],
"$vm_col_9"[VARCHAR2,25], "$vm_col_10"[VARCHAR2,8]
10 - (#keys=11) ROWID[ROWID,10], "GMMANAME_VC"[VARCHAR2,30],
"PK_DEALERCODE_VC"[VARCHAR2,8], "DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100],
"PROVINCE_VC"[VARCHAR2,2], "MMACODE_VC"[VARCHAR2,4], "DLR"."AREANAME_VC"[VARCHAR2,50],
"DLR"."MMANAME_VC"[VARCHAR2,25], "GMMANAME_VC"[VARCHAR2,30], "ZONENAME_VC"[VARCHAR2,25],
"DLR"."PK_DEALERCODE_VC"[VARCHAR2,8]
11 - (#keys=1) ROWID[ROWID,10], "DLR"."PK_DEALERCODE_VC"[VARCHAR2,8],
"DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100], "PROVINCE_VC"[VARCHAR2,2],
"ZONENAME_VC"[VARCHAR2,25], "MMACODE_VC"[VARCHAR2,4], "DLR"."MMANAME_VC"[VARCHAR2,25],
"DLR"."AREANAME_VC"[VARCHAR2,50], "PK_DEALERCODE_VC"[VARCHAR2,8], "GMMANAME_VC"[VARCHAR2,30]
12 - (rowset=256) ROWID[ROWID,10], "DLR"."PK_DEALERCODE_VC"[VARCHAR2,8],
"DLR"."DEALERNAMESHORT_VC"[VARCHAR2,100], "PROVINCE_VC"[VARCHAR2,2],
"ZONENAME_VC"[VARCHAR2,25], "MMACODE_VC"[VARCHAR2,4], "DLR"."MMANAME_VC"[VARCHAR2,25],
"DLR"."AREANAME_VC"[VARCHAR2,50]
13 - (rowset=256) "PK_DEALERCODE_VC"[VARCHAR2,8], "GMMANAME_VC"[VARCHAR2,30]
CREATE TABLE GMSQLDBDomesticGeographyData (
PK_DA_vc Varchar2(8) NOT NULL ,
FSA_vc Varchar2(3) NULL ,
FSAName_vc Varchar2(100) NULL ,
COCMACode_vc Varchar2(5) NULL ,
COCMAName_vc Varchar2(50) NULL ,
PBGMACode_vc Varchar2(5) NULL ,
PBGMAName_vc Varchar2(50) NULL ,
CADMACode_vc Varchar2(5) NULL ,
CADMAName_vc Varchar2(50) NULL ,
HUMMACode_vc Varchar2(5) NULL ,
HUMMAName_vc Varchar2(50) NULL ,
MDMACode_vc Varchar2(5) NULL ,
MDMAName_vc Varchar2(50) NULL ,
DomesticMMACode_vc Varchar2(4) NULL ,
DomesticMMAName_vc Varchar2(25) NULL ,
ProvinceCode_vc Varchar2(2) NULL ,
ProvinceName_vc Varchar2(50) NULL ,
ReportTerritoryCode_vc Varchar2(2) NULL ,
ReportTerritoryName_vc Varchar2(50) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMAName_vc Varchar2(30) NULL ,
AREACode_vc Varchar2(5) NULL ,
AREAName_vc Varchar2(50) NULL ,
OntarioSpecialMarket_vc Varchar2(50) NULL ,
CONSTRAINT PK_GMSQLDBDomesticGeographyData PRIMARY KEY
(
PK_DA_vc
)
);
CREATE TABLE GM_TEMP_VehicleCountByDA (
PK_DA_vc Varchar2(10) NULL ,
VehicleCount_in Number(10) NULL ,
ReportYear_in Number(10) NULL ,
ReportMonth_in Number(10) NULL ,
gmcustomtypecode_vc Varchar2(100) NULL ,
GMCustomDetailedSegmentCode_vc Varchar2(100) NULL ,
gmcustomweightgroupname_vc Varchar2(100) NULL ,
gmcustomeManufacturername_vc Varchar2(50) NULL ,
genericmanufacturername_vc Varchar2(50) NULL ,
GMPrimaryCode_vc Varchar2(1) NULL ,
makedescription_vc Varchar2(50) NULL ,
GMCustomImportDomesticName_vc Varchar2(30) NULL
);
CREATE TABLE MAEDealerGuideFile (
PK_DealerCode_vc Varchar2(8) NOT NULL ,
StatusCode_vc Varchar2(1) NOT NULL ,
OPFlag_vc Varchar2(1) NULL ,
StatusName_vc Varchar2(15) NULL ,
DealerName_vc Varchar2(100) NULL ,
DealerNameShort_vc Varchar2(100) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
SalesTerritoryCode_vc Varchar2(2) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMAName_vc Varchar2(30) NULL ,
GMMALevelCode_vc Varchar2(1) NULL ,
GMMAGroupKey Number(10) DEFAULT (0) NULL ,
OutOfVolume Number(10) DEFAULT (0) NULL ,
Rank Number(10) DEFAULT (0) NULL ,
MMACode_vc Varchar2(4) NULL ,
MMAName_vc Varchar2(25) NULL ,
NationalCode_vc Varchar2(3) DEFAULT ('NAT') NULL ,
NationalName_vc Varchar2(8) DEFAULT ('NATIONAL') NULL ,
NationalAssignedCode_vc Varchar2(1) DEFAULT ('A') NULL ,
NationalAssignedName_vc Varchar2(10) DEFAULT ('ASSIGNED') NULL ,
ReplacedByDealerCode_vc Varchar2(20) NULL ,
ReplacingDealerCode_vc Varchar2(20) NULL ,
FranchiseCodes_vc Varchar2(15) NULL ,
FranchisesCarried Varchar2(30) DEFAULT (' ') NULL ,
FranchisesCarried4Print Varchar2(30) DEFAULT (' ') NULL ,
Chevrolet Varchar2(1) NOT NULL ,
PBG Varchar2(1) NOT NULL ,
Cadillac Varchar2(1) NOT NULL ,
Hummer Varchar2(1) NOT NULL ,
Saturn Varchar2(1) NOT NULL ,
Saab Varchar2(1) NOT NULL ,
Isuzu Varchar2(1) NOT NULL ,
AreaName_vc Varchar2(50) NULL ,
CityCode_vc Varchar2(2) NULL ,
MACode_vc Varchar2(5) NULL ,
MAName_vc Varchar2(20) NULL ,
DealerBACCode_vc Varchar2(11) NULL
);
CREATE TABLE GMSQLDBGMDealerFile (
PK_DealerCode_vc Varchar2(8) NOT NULL ,
StatusCode_vc Varchar2(1) NULL ,
StatusName_vc Varchar2(15) NULL ,
OPFlag_vc Varchar2(1) NULL ,
BusFranchiseFlag_vc Varchar2(1) NULL ,
Language_vc Varchar2(1) NULL ,
FrenchFlag_vc Varchar2(1) NULL ,
DealerName_vc Varchar2(100) NULL ,
DealerNameShort_vc Varchar2(100) NULL ,
Address_vc Varchar2(50) NULL ,
POBox_vc Varchar2(50) NULL ,
City_vc Varchar2(30) NULL ,
Province_vc Varchar2(2) NULL ,
FSALDU_vc Varchar2(7) NULL ,
ZoneCode_vc Varchar2(2) NULL ,
ZoneName_vc Varchar2(25) NULL ,
EWCode_vc Varchar2(1) NULL ,
EWName_vc Varchar2(4) NOT NULL ,
FranchiseCodes_vc Varchar2(15) NULL ,
ChevFranchise_bt Number(1) NULL ,
PBGFranchise_bt Number(1) NULL ,
CadFranchise_bt Number(1) NULL ,
HumFranchise_bt Number(1) NULL ,
SatFranchise_bt Number(1) NULL ,
SaabFranchise_bt Number(1) NULL ,
IsuzuFranchise_bt Number(1) NULL ,
SalesTerritoryCode_vc Varchar2(2) NULL ,
GMMACode_vc Varchar2(2) NULL ,
GMMALevelCode_vc Varchar2(1) NULL ,
MMACode_vc Varchar2(4) NULL ,
MMAName_vc Varchar2(25) NULL ,
TerminationDate_d Varchar2(11) NULL ,
ReplacingDealercode_vc Varchar2(20) NULL ,
ReplacedByDealerCode_vc Varchar2(20) NULL ,
ServiceTerritoryCode_vc Varchar2(2) NULL ,
AreaName_vc Varchar2(50) NULL ,
CityCode_vc Varchar2(2) NULL ,
MACode_vc Varchar2(5) NULL ,
MAName_vc Varchar2(20) NULL ,
DealerBACCode_vc Varchar2(11) NULL
);
列的基数：
TABLE_NAME COLUMN_NAME NUM_DISTINCT
GM_TEMP_VEHICLECOUNTBYDA PK_DA_VC 54936
GM_TEMP_VEHICLECOUNTBYDA VEHICLECOUNT_IN 660
GM_TEMP_VEHICLECOUNTBYDA REPORTYEAR_IN 6
GM_TEMP_VEHICLECOUNTBYDA REPORTMONTH_IN 2
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMTYPECODE_VC 2
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMDETAILEDSEGMENTCODE_VC 72
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMWEIGHTGROUPNAME_VC 4
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMEMANUFACTURERNAME_VC 47
GM_TEMP_VEHICLECOUNTBYDA GENERICMANUFACTURERNAME_VC 48
GM_TEMP_VEHICLECOUNTBYDA GMPRIMARYCODE_VC 3
GM_TEMP_VEHICLECOUNTBYDA MAKEDESCRIPTION_VC 71
GM_TEMP_VEHICLECOUNTBYDA GMCUSTOMIMPORTDOMESTICNAME_VC 2
MAEDEALERGUIDEFILE PK_DEALERCODE_VC 511
MAEDEALERGUIDEFILE STATUSCODE_VC 4
MAEDEALERGUIDEFILE OPFLAG_VC 2
MAEDEALERGUIDEFILE STATUSNAME_VC 2
MAEDEALERGUIDEFILE DEALERNAME_VC 502
MAEDEALERGUIDEFILE DEALERNAMESHORT_VC 509
MAEDEALERGUIDEFILE ZONECODE_VC 3
MAEDEALERGUIDEFILE ZONENAME_VC 3
MAEDEALERGUIDEFILE SALESTERRITORYCODE_VC 14
MAEDEALERGUIDEFILE GMMACODE_VC 7
MAEDEALERGUIDEFILE GMMANAME_VC 7
MAEDEALERGUIDEFILE GMMALEVELCODE_VC 9
MAEDEALERGUIDEFILE GMMAGROUPKEY 39
MAEDEALERGUIDEFILE OUTOFVOLUME 24
MAEDEALERGUIDEFILE RANK 1
MAEDEALERGUIDEFILE MMACODE_VC 20
MAEDEALERGUIDEFILE MMANAME_VC 20
MAEDEALERGUIDEFILE NATIONALCODE_VC 1
MAEDEALERGUIDEFILE NATIONALNAME_VC 1
MAEDEALERGUIDEFILE NATIONALASSIGNEDCODE_VC 1
MAEDEALERGUIDEFILE NATIONALASSIGNEDNAME_VC 1
MAEDEALERGUIDEFILE REPLACEDBYDEALERCODE_VC 0
MAEDEALERGUIDEFILE REPLACINGDEALERCODE_VC 279
MAEDEALERGUIDEFILE FRANCHISECODES_VC 88
MAEDEALERGUIDEFILE FRANCHISESCARRIED 7
MAEDEALERGUIDEFILE FRANCHISESCARRIED4PRINT 7
MAEDEALERGUIDEFILE CHEVROLET 2
MAEDEALERGUIDEFILE PBG 2
MAEDEALERGUIDEFILE CADILLAC 2
MAEDEALERGUIDEFILE HUMMER 1
MAEDEALERGUIDEFILE SATURN 1
MAEDEALERGUIDEFILE SAAB 1
MAEDEALERGUIDEFILE ISUZU 1
MAEDEALERGUIDEFILE AREANAME_VC 464
MAEDEALERGUIDEFILE CITYCODE_VC 3
MAEDEALERGUIDEFILE MACODE_VC 3
MAEDEALERGUIDEFILE MANAME_VC 2
MAEDEALERGUIDEFILE DEALERBACCODE_VC 448
GMSQLDBGMDEALERFILE PK_DEALERCODE_VC 556
GMSQLDBGMDEALERFILE STATUSCODE_VC 3
GMSQLDBGMDEALERFILE STATUSNAME_VC 3
GMSQLDBGMDEALERFILE OPFLAG_VC 2
GMSQLDBGMDEALERFILE BUSFRANCHISEFLAG_VC 0
GMSQLDBGMDEALERFILE LANGUAGE_VC 2
GMSQLDBGMDEALERFILE FRENCHFLAG_VC 0
GMSQLDBGMDEALERFILE DEALERNAME_VC 546
GMSQLDBGMDEALERFILE DEALERNAMESHORT_VC 550
GMSQLDBGMDEALERFILE ADDRESS_VC 469
GMSQLDBGMDEALERFILE POBOX_VC 130
GMSQLDBGMDEALERFILE CITY_VC 426
GMSQLDBGMDEALERFILE PROVINCE_VC 13
GMSQLDBGMDEALERFILE FSALDU_VC 468
GMSQLDBGMDEALERFILE ZONECODE_VC 3
GMSQLDBGMDEALERFILE ZONENAME_VC 3
GMSQLDBGMDEALERFILE EWCODE_VC 0
GMSQLDBGMDEALERFILE EWNAME_VC 0
GMSQLDBGMDEALERFILE FRANCHISECODES_VC 100
GMSQLDBGMDEALERFILE CHEVFRANCHISE_BT 2
GMSQLDBGMDEALERFILE PBGFRANCHISE_BT 2
GMSQLDBGMDEALERFILE CADFRANCHISE_BT 2
GMSQLDBGMDEALERFILE HUMFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SATFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SAABFRANCHISE_BT 1
GMSQLDBGMDEALERFILE ISUZUFRANCHISE_BT 1
GMSQLDBGMDEALERFILE SALESTERRITORYCODE_VC 14
GMSQLDBGMDEALERFILE GMMACODE_VC 7
GMSQLDBGMDEALERFILE GMMALEVELCODE_VC 9
GMSQLDBGMDEALERFILE MMACODE_VC 20
GMSQLDBGMDEALERFILE MMANAME_VC 20
GMSQLDBGMDEALERFILE TERMINATIONDATE_D 1
GMSQLDBGMDEALERFILE REPLACINGDEALERCODE_VC 304
GMSQLDBGMDEALERFILE REPLACEDBYDEALERCODE_VC 23
GMSQLDBGMDEALERFILE SERVICETERRITORYCODE_VC 13
GMSQLDBGMDEALERFILE AREANAME_VC 468
GMSQLDBGMDEALERFILE CITYCODE_VC 3
GMSQLDBGMDEALERFILE MACODE_VC 3
GMSQLDBGMDEALERFILE MANAME_VC 2
GMSQLDBGMDEALERFILE DEALERBACCODE_VC 486
GMSQLDBDOMESTICGEOGRAPHYDATA PK_DA_VC 53941
GMSQLDBDOMESTICGEOGRAPHYDATA FSA_VC 1576
GMSQLDBDOMESTICGEOGRAPHYDATA FSANAME_VC 588
GMSQLDBDOMESTICGEOGRAPHYDATA COCMACODE_VC 438
GMSQLDBDOMESTICGEOGRAPHYDATA COCMANAME_VC 436
GMSQLDBDOMESTICGEOGRAPHYDATA PBGMACODE_VC 426
GMSQLDBDOMESTICGEOGRAPHYDATA PBGMANAME_VC 425
GMSQLDBDOMESTICGEOGRAPHYDATA CADMACODE_VC 126
GMSQLDBDOMESTICGEOGRAPHYDATA CADMANAME_VC 125
GMSQLDBDOMESTICGEOGRAPHYDATA HUMMACODE_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA HUMMANAME_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA MDMACODE_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA MDMANAME_VC 1
GMSQLDBDOMESTICGEOGRAPHYDATA DOMESTICMMACODE_VC 20
GMSQLDBDOMESTICGEOGRAPHYDATA DOMESTICMMANAME_VC 20
GMSQLDBDOMESTICGEOGRAPHYDATA PROVINCECODE_VC 12
GMSQLDBDOMESTICGEOGRAPHYDATA PROVINCENAME_VC 12
GMSQLDBDOMESTICGEOGRAPHYDATA REPORTTERRITORYCODE_VC 14
GMSQLDBDOMESTICGEOGRAPHYDATA REPORTTERRITORYNAME_VC 14
GMSQLDBDOMESTICGEOGRAPHYDATA ZONECODE_VC 3
GMSQLDBDOMESTICGEOGRAPHYDATA ZONENAME_VC 3
GMSQLDBDOMESTICGEOGRAPHYDATA GMMACODE_VC 7
GMSQLDBDOMESTICGEOGRAPHYDATA GMMANAME_VC 7
GMSQLDBDOMESTICGEOGRAPHYDATA AREACODE_VC 438
GMSQLDBDOMESTICGEOGRAPHYDATA AREANAME_VC 437
GMSQLDBDOMESTICGEOGRAPHYDATA ONTARIOSPECIALMARKET_VC 3
一些快速的建议 -
我看到您在每次加入时都使用 trim。建议尽可能不要这样做，至少对于基于主键的连接，例如 - TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc) 如果不是绝对必要的话.因为，默认情况下，主键在 oracle 中建立在它们之上的索引。如果你在连接时用函数包装它们，查询优化器将无法在连接时使用基于 pk 的索引，这会对你的查询性能产生负面影响。
关于获取“carIndy -4 & ..-3 etc..”的查询，你不需要每次都重复查询。在 select 中，只需使用 Sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 then VehicleCount_in else 0 end) as "CarIndY - 3", .... "CarIndY - 4" 在同一查询中并在连接中使用此查询而不是 select .由于这些本质上是计数，因此该子集只有一行包含您需要的所有列，因此您应该能够交叉连接它并获取主查询 select 中的所有 carIndY - n 列
此外，将主要连接条件放在过滤条件之前，例如在您的查询中您有 -
哪里 ((nvl(dlr.ChevFranchise_bt, 0) = 1 AND nvl(dlr.PBGFranchise_bt, 0) = 0)) 和 StatusName_vc = 'Active' AND TRIM(dlr.PK_DealerCode_vc) = TRIM(gmma.PK_DealerCode_vc)
这里，第 4 个 and 条件是主要的连接条件，应该在 where
中的其他条件之前首先提到它由于没有索引，您可以尝试使用以下索引进行以下查询 -
SELECT dlr.PK_DealerCode_vc,
dlr.DealerNameShort_vc,
CASE WHEN mmacode_vc = '' THEN Province_vc
ELSE '' END,
dlr.AREAName_vc,
dlr.MMAName_vc,
gmma.GMMAName_vc,
ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
NVL(SUM(CASE WHEN (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4 THEN VehicleCount_in END), 0) "CarIndY - 4",
NVL(SUM(CASE WHEN (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 THEN VehicleCount_in END), 0) "CarIndY - 3"
FROM DealerFile dlr,
JOIN (SELECT DISTINCT PK_DealerCode_vc,
GMMAName_vc
FROM DealerGuideFile) gmma ON TRIM(dlr.PK_DealerCode_vc) =
TRIM(gmma.PK_DealerCode_vc)
JOIN (SELECT COCMACode_vc, VehicleCount_in, ReportYear_in
FROM VehicleCountByDA b
JOIN DomesticGeographyData a ON TRIM(a.PK_DA_vc) = TRIM(b.PK_DA_vc)
WHERE gmprimarycode_vc = 'R'
AND TRIM(gmcustomweightgroupname_vc) = 'NON-TRUCK') CarIndY ON TRIM(CARINDY.COCMACode_vc) = TRIM(dlr.PK_DealerCode_vc)
WHERE nvl(dlr.ChevFranchise_bt, 0) = 1
AND nvl(dlr.PBGFranchise_bt, 0) = 0
AND StatusName_vc = 'Active'
AND DealerName_vc NOT LIKE '%Study Area%'
AND DealerName_vc NOT LIKE '%Open Point%'
AND DealerName_vc NOT LIKE '%Branch%'
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc)) <= 5;
您可能在每个 table -
上有以下索引DealerFile - TRIM(PK_DealerCode_vc), TRIM(PK_DealerCode_vc), nvl(ChevFranchise_bt, 0), nvl(PBGFranchise_bt, 0), LENGTH(RTRIM(PK_DealerCode_vc));
VehicleCountByDA - TRIM(PK_DA_vc);
DomesticGeographyData - TRIM(PK_DA_vc), TRIM(COCMACode_vc);
你的 'dates' 真的是 hard-coded 字符串，还是你这样做只是为了在这里发帖？ Hard-coding 这看起来很不切实际，所以我假设你这样做是为了演示..
这个结构在你的 SELECT
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy'),
可以简化为
to_char(to_date('30-jun-2020','dd-mon-yyyy'),'mmyy')
和
WHERE (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4
如果该日期没有硬编码，几乎肯定还有其他机会来改进您对日期的处理，但我们需要知道您在那里真正使用的是什么。
https://edstevensdba.wordpress.com/2011/04/07/nls_date_format/
正如@Somy 所建议的那样，一个简单的编辑将成本降低了 4 倍：
SELECT
-- DealerCode_vc varchar(6), DealerName_vc varchar(100), province_vc, MAName_vc varchar(25), MMAName_vc varchar(25), GMMAName_vc varchar(25), Zone_vc varchar(25), ReportPeriod_vc varchar(50),
dlr.PK_DealerCode_vc, dlr.DealerNameShort_vc,
case when mmacode_vc = '' then Province_vc else '' end province_vc,
dlr.AREAName_vc, dlr.MMAName_vc, gmma.GMMAName_vc, dlr.ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy') reportperiod_vc
-- CarIndY-4 int,
,NVL(sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 4 then VehicleCount_in else 0 end ),0) "CarIndY-4"
-- CarIndY-3 int,
,NVL(sum(case when (TO_NUMBER(TO_CHAR(to_date('30-jun-2020'), 'yyyy')) - ReportYear_in) = 3 then VehicleCount_in else 0 end),0) "CarIndY-3"
FROM GMSQLDBGMDealerFile dlr,
(Select distinct PK_DealerCode_vc, GMMAName_vc from MAEDealerGuideFile) gmma,
GM_TEMP_VehicleCountByDA b,GMSQLDBDomesticGeographyData a
WHERE trim(dlr.PK_DealerCode_vc) = trim(gmma.PK_DealerCode_vc)
AND trim(a.COCMACode_vc) = trim(dlr.PK_DealerCode_vc)
and trim(a.PK_DA_vc) = trim(b.PK_DA_vc)
and ((nvl(dlr.ChevFranchise_bt,0) = 1 AND nvl(dlr.PBGFranchise_bt,0)=0))
AND StatusName_vc = 'Active'
AND DealerName_vc not like ('%Study Area%')
AND DealerName_vc not like ('%Open Point%')
AND DealerName_vc not like ('%Branch%')
AND LENGTH(RTRIM(dlr.PK_DealerCode_vc))<=5
AND gmprimarycode_vc='R' and trim(gmcustomweightgroupname_vc) = 'NON-TRUCK'
group by dlr.PK_DealerCode_vc, dlr.DealerNameShort_vc,
case when mmacode_vc = '' then Province_vc else '' end ,
dlr.AREAName_vc, dlr.MMAName_vc, gmma.GMMAName_vc, dlr.ZoneName_vc,
to_char(to_date('30-jun-2020'), 'mm') || ' ' || to_char(to_date('30-jun-2020'), 'yy') ;