在MySQL 5.7上有很多左連接和索引的查詢很慢

我得到了在MySQL 5.7和MariaDB-10.1.8上運行的這個查詢。在MySQL 5.7上有很多左連接和索引的查詢很慢

 

    SELECT 
     src.LINE AS ExcelRowNumber, 
     bveh.BaseVehicleID, 
     pa.Part_Id, 
     CASE 
     WHEN model.ModelID IS NOT NULL THEN model.ModelID 
     ELSE 0 
     END AS ModelID, 
     CASE 
     WHEN ebas.EngineBaseID IS NOT NULL THEN ebas.EngineBaseID 
     ELSE 0 
     END AS EngineBaseID, 
     CASE 
     WHEN smod.SubModelId IS NOT NULL THEN smod.SubModelId 
     ELSE 0 
     END AS SubModelId, 
     CASE 
     WHEN mbco.MfrBodyCodeID IS NOT NULL THEN mbco.MfrBodyCodeID 
     ELSE 0 
     END AS MfrBodyCodeID, 
     CASE 
     WHEN bndo.BodyNumDoorsID IS NOT NULL THEN bndo.BodyNumDoorsID 
     ELSE 0 
     END AS BodyNumDoorsID, 
     CASE 
     WHEN btyp.BodyTypeID IS NOT NULL THEN btyp.BodyTypeID 
     ELSE 0 
     END AS BodyTypeID, 
     CASE 
     WHEN dtyp.DriveTypeID IS NOT NULL THEN dtyp.DriveTypeID 
     ELSE 0 
     END AS DriveTypeID, 
     CASE 
     WHEN edes.EngineDesignationID IS NOT NULL THEN edes.EngineDesignationID 
     ELSE 0 
     END AS EngineDesignationID, 
     CASE 
     WHEN evin.EngineVINID IS NOT NULL THEN evin.EngineVINID 
     ELSE 0 
     END AS EngVINID, 
     CASE 
     WHEN fdco.FuelDeliveryConfigID IS NOT NULL THEN fdco.FuelDeliveryConfigID 
     ELSE 0 
     END AS FuelDeliveryConfigID, 
     CASE 
     WHEN fdty.FuelDeliveryTypeID IS NOT NULL THEN fdty.FuelDeliveryTypeID 
     ELSE 0 
     END AS FuelDeliveryTypeID, 
     CASE 
     WHEN fdst.FuelDeliverySubTypeID IS NOT NULL THEN fdst.FuelDeliverySubTypeID 
     ELSE 0 
     END AS FuelDeliverySubTypeID, 
     CASE 
     WHEN fsct.FuelSystemControlTypeID IS NOT NULL THEN fsct.FuelSystemControlTypeID 
     ELSE 0 
     END AS FuelSysControlTypeID, 
     CASE 
     WHEN fsde.FuelSystemDesignID IS NOT NULL THEN fsde.FuelSystemDesignID 
     ELSE 0 
     END AS FuelSystemDesignID, 
     CASE 
     WHEN aspi.AspirationID IS NOT NULL THEN aspi.AspirationID 
     ELSE 0 
     END AS AspirationID, 
     CASE 
     WHEN chty.CylinderHeadTypeID IS NOT NULL THEN chty.CylinderHeadTypeID 
     ELSE 0 
     END AS CylHeadTypeID, 
     CASE 
     WHEN ftyp.FuelTypeID IS NOT NULL THEN ftyp.FuelTypeID 
     ELSE 0 
     END AS FuelTypeID, 
     CASE 
     WHEN isty.IgnitionSystemTypeID IS NOT NULL THEN isty.IgnitionSystemTypeID 
     ELSE 0 
     END AS IgnitionSystemTypeID, 
     CASE 
     WHEN ttyp.TransmissionTypeID IS NOT NULL THEN ttyp.TransmissionTypeID 
     ELSE 0 
     END AS TransmissionTypeID, 
     CASE 
     WHEN tbas.TransmissionBaseID IS NOT NULL THEN tbas.TransmissionBaseID 
     ELSE 0 
     END AS TransmissionBaseID, 
     CASE 
     WHEN tcty.TransmissionControlTypeID IS NOT NULL THEN tcty.TransmissionControlTypeID 
     ELSE 0 
     END AS TransmissionControlTypeID, 
     CASE 
     WHEN tmco.TransmissionMfrCodeID IS NOT NULL THEN tmco.TransmissionMfrCodeID 
     ELSE 0 
     END AS TransmissionMfrCodeID, 
     CASE 
     WHEN tnsp.TransmissionNumSpeedsID IS NOT NULL THEN tnsp.TransmissionNumSpeedsID 
     ELSE 0 
     END AS TransmissionNumSpeedsID, 
     CASE 
     WHEN elec.ElecControlledID IS NOT NULL THEN elec.ElecControlledID 
     ELSE 0 
     END AS TransmissionElecControlledID, 
     CASE 
     WHEN bedtyp.BedTypeID IS NOT NULL THEN bedtyp.BedTypeID 
     ELSE 0 
     END AS BedTypeID, 
     CASE 
     WHEN blen.BedLengthID IS NOT NULL THEN blen.BedLengthID 
     ELSE 0 
     END AS BedLengthID, 
     CASE 
     WHEN bcon.BedConfigID IS NOT NULL THEN bcon.BedConfigID 
     ELSE 0 
     END AS BedConfigID, 
     CASE 
     WHEN wbas.WheelBaseID IS NOT NULL THEN wbas.WheelBaseID 
     ELSE 0 
     END AS WheelBaseID, 
     CASE 
     WHEN brtyf.BrakeTypeID IS NOT NULL THEN brtyf.BrakeTypeID 
     ELSE 0 
     END AS FrontBrakeTypeID, 
     CASE 
     WHEN brtyr.BrakeTypeID IS NOT NULL THEN brtyr.BrakeTypeID 
     ELSE 0 
     END AS RearBrakeTypeID, 
     CASE 
     WHEN stypf.SpringTypeID IS NOT NULL THEN stypf.SpringTypeID 
     ELSE 0 
     END AS FrontSpringTypeID, 
     CASE 
     WHEN stypr.SpringTypeID IS NOT NULL THEN stypr.SpringTypeID 
     ELSE 0 
     END AS RearSpringTypeID, 
     CASE 
     WHEN bsys.BrakeSystemID IS NOT NULL THEN bsys.BrakeSystemID 
     ELSE 0 
     END AS BrakeSystemID, 
     CASE 
     WHEN babs.BrakeABSID IS NOT NULL THEN babs.BrakeABSID 
     ELSE 0 
     END AS BrakeABSID, 
     CASE 
     WHEN steertyp.SteeringTypeID IS NOT NULL THEN steertyp.SteeringTypeID 
     ELSE 0 
     END AS SteeringTypeID, 
     CASE 
     WHEN steersys.SteeringSystemID IS NOT NULL THEN steersys.SteeringSystemID 
     ELSE 0 
     END AS SteeringSystemID, 
     CASE 
     WHEN regi.RegionID IS NOT NULL THEN regi.RegionID 
     ELSE 0 
     END AS RegionAbbrID, 
     CASE 
     WHEN ever.EngineVersionID IS NOT NULL THEN ever.EngineVersionID 
     ELSE 0 
     END AS EngineVersionID, 
     CASE 
     WHEN valv.ValvesID IS NOT NULL THEN valv.ValvesID 
     ELSE 0 
     END AS EngineValvesID, 
     CASE 
     WHEN pout.PowerOutputID IS NOT NULL THEN pout.PowerOutputID 
     ELSE 0 
     END AS PowerOutputID, 
     CASE 
     WHEN vtyp.VehicleTypeID IS NOT NULL THEN vtyp.VehicleTypeID 
     ELSE 0 
     END AS VehicleTypeID, 
     CASE 
     WHEN engMfr.MfrID IS NOT NULL THEN engMfr.MfrID 
     ELSE 0 
     END AS EngineMfrID, 
     IsValidable_yn AS IsValidable, 
     src.Year, 
     src.Product, 
     pl.Product_Line_Id, 
     src.PartNumber, 
     src.MfrLabel, 
     src.Qty, 
     src.Picture1, 
     src.Picture2, 
     src.DateAddedPart, 
     src.DateModifiedPart, 
     src.ApplicationNote1 AS Note1, 
     src.ApplicationNote2 AS Note2, 
     src.ApplicationNote3 AS Note3, 
     src.ApplicationNote4 AS Note4, 
     src.ApplicationNote5 AS Note5, 
     src.ApplicationNote6 AS Note6, 
     src.ApplicationNote7 AS Note7, 
     src.ApplicationNote8 AS Note8, 
     src.ApplicationNote9 AS Note9, 
     src.ApplicationNote10 AS Note10, 
     src.PublishingNote1, 
     src.PublishingNote2, 
     src.PublishingNote3, 
     src.PublishingNote4, 
     src.PublishingNote5, 
     src.Foot_note_numbers, 
     src.Foot_note_values, 
     CASE 
     WHEN transMfr.MfrID IS NOT NULL THEN transMfr.MfrID 
     ELSE 0 
     END AS TransmissionMfrID, 
     src.DateAdded, 
     src.DateModified, 
     src.SpecialInfo1, 
     src.SpecialInfo2, 
     src.SpecialInfo3, 
     src.LifeCycle_Pies_Code_read_only, 
     src.LifeCycle_Desc_short, 
     src.LifeCycle_Desc_Long_read_only, 
     src.PopCode, 
     src.PopCode_Desc_read_only, 
     src.AssetLogicalName, 
     src.AssetItemRef, 
     src.AssetItemOrder, 
     src.AssetFileName, 
     src.Action 
    FROM pcdmb_oevierol_oct26_pc75.ExcelToSQLTemporaryTable src 

    JOIN pcdmb_oevierol_oct26_pc75.Brand brand 
     ON brand.BrandId = CAST(1 AS UNSIGNED) 
    JOIN pcdmb_oevierol_oct26_pc75.Product_Line pl 
     ON src.Product = pl.Product_Line_En 
     AND pl.BrandID = brand.BrandID 
    LEFT JOIN pcdmb_oevierol_oct26_pc75.Part pa 
     ON src.PartNumber = pa.PartNumber 
     AND pa.Product_Line_Id = pl.Product_Line_Id 
    LEFT JOIN vcdb_sept2016.Make mak 
     ON mak.MakeName = src.Make 
    LEFT JOIN vcdb_sept2016.VehicleType vtyp 
     ON (vtyp.VehicleTypeName = src.VehicleType) 
    LEFT JOIN vcdb_sept2016.Model model 
     ON model.ModelName = src.Model 
     AND (model.VehicleTypeID = vtyp.VehicleTypeID 
     OR src.VehicleType = '') 
    JOIN vcdb_sept2016.BaseVehicle bveh 
     ON bveh.YearID = src.Year 
     AND bveh.MakeID = mak.MakeID 
     AND bveh.ModelID = model.ModelID 


    LEFT JOIN vcdb_sept2016.EngineBase ebas 
     ON (ebas.Liter = src.EngineLiters) 
     AND (ebas.CC = src.EngineCC) 
     AND (ebas.CID = src.EngineCID) 
     AND (ebas.Cylinders = src.EngineCylinder) 
     AND (ebas.BlockType = src.EngineBlock) 
     AND (ebas.EngBoreIn = src.EngBoreInch) 
     AND (ebas.EngBoreMetric = src.EngBoreMetric) 
     AND (ebas.EngStrokeIn = src.EngStrokeInch) 
     AND (ebas.EngStrokeMetric = src.EngStrokeMetric) 

    LEFT JOIN vcdb_sept2016.SubModel smod 
     ON (smod.SubmodelName = src.Submodel) 
    LEFT JOIN vcdb_sept2016.MfrBodyCode mbco 
     ON (mbco.MfrBodyCodeName = src.MfrBodyCode) 
    LEFT JOIN vcdb_sept2016.BodyNumDoors bndo 
     ON (bndo.BodyNumDoors = src.BodyNumDoors) 
    LEFT JOIN vcdb_sept2016.BodyType btyp 
     ON (btyp.BodyTypeName = src.BodyType) 
    LEFT JOIN vcdb_sept2016.DriveType dtyp 
     ON (dtyp.DriveTypeName = src.DriveType) 
    LEFT JOIN vcdb_sept2016.EngineDesignation edes 
     ON (edes.EngineDesignationName = src.EngineDesignation) 
    LEFT JOIN vcdb_sept2016.EngineVIN evin 
     ON (evin.EngineVINName = src.EngineVIN) 
    LEFT JOIN vcdb_sept2016.FuelDeliveryType fdty 
     ON (fdty.FuelDeliveryTypeName = src.FuelDeliveryType) 
    LEFT JOIN vcdb_sept2016.FuelDeliverySubType fdst 
     ON (fdst.FuelDeliverySubTypeName = src.FuelDeliverySubType) 
    LEFT JOIN vcdb_sept2016.FuelSystemControlType fsct 
     ON (fsct.FuelSystemControlTypeName = src.FuelSystemControlType) 
    LEFT JOIN vcdb_sept2016.FuelSystemDesign fsde 
     ON (fsde.FuelSystemDesignName = src.FuelSystemDesign) 
    LEFT JOIN vcdb_sept2016.FuelDeliveryConfig fdco 
     ON (fdco.FuelDeliveryTypeID = fdty.FuelDeliveryTypeID 
     AND fdco.FuelDeliverySubTypeID = fdst.FuelDeliverySubTypeID 
     AND fdco.FuelSystemControlTypeID = fsct.FuelSystemControlTypeID 
     AND fdco.FuelSystemDesignID = fsde.FuelSystemDesignID) 
    LEFT JOIN vcdb_sept2016.Aspiration aspi 
     ON (aspi.AspirationName = src.Aspiration) 
    LEFT JOIN vcdb_sept2016.CylinderHeadType chty 
     ON (chty.CylinderHeadTypeName = src.CylinderHeadType) 
    LEFT JOIN vcdb_sept2016.FuelType ftyp 
     ON (ftyp.FuelTypeName = src.FuelType) 
    LEFT JOIN vcdb_sept2016.IgnitionSystemType isty 
     ON (isty.IgnitionSystemTypeName = src.IgnitionSystemType) 
    LEFT JOIN vcdb_sept2016.Mfr transMfr 
     ON (transMfr.MfrName = src.TransmissionMfr) 
    LEFT JOIN vcdb_sept2016.TransmissionType ttyp 
     ON (ttyp.TransmissionTypeName = src.TransmissionType) 
    LEFT JOIN vcdb_sept2016.TransmissionControlType tcty 
     ON (tcty.TransmissionControlTypeName = src.TransmissionControlType) 
    LEFT JOIN vcdb_sept2016.TransmissionMfrCode tmco 
     ON (tmco.TransmissionMfrCode = src.TransmissionMfrCode) 
    LEFT JOIN vcdb_sept2016.TransmissionNumSpeeds tnsp 
     ON (tnsp.TransmissionNumSpeeds = src.TransmissionNumSpeeds) 
    LEFT JOIN vcdb_sept2016.ElecControlled elec 
     ON elec.ElecControlled = src.TransmissionElecControlled 

    LEFT JOIN vcdb_sept2016.TransmissionBase tbas 
     ON (tbas.TransmissionTypeID = ttyp.TransmissionTypeID 
     AND tbas.TransmissionNumSpeedsID = tnsp.TransmissionNumSpeedsID 
     AND tbas.TransmissionControlTypeID = tcty.TransmissionControlTypeID) 
    LEFT JOIN vcdb_sept2016.BedLength blen 
     ON (blen.BedLength = src.BedLength) 
    LEFT JOIN vcdb_sept2016.BedType bedtyp 
     ON (bedtyp.BedTypeName = src.BedType) 

    LEFT JOIN vcdb_sept2016.BedConfig bcon 
     ON (bcon.BedLengthID = blen.BedLengthID 
     AND bcon.BedTypeID = bedtyp.BedTypeID) 
    LEFT JOIN vcdb_sept2016.WheelBase wbas 
     ON (wbas.WheelBase = src.WheelBase) 
    LEFT JOIN vcdb_sept2016.BrakeType brtyf 
     ON (brtyf.BrakeTypeName = src.FrontBrakeType) 
    LEFT JOIN vcdb_sept2016.BrakeType brtyr 
     ON (brtyr.BrakeTypeName = src.RearBrakeType) 
    LEFT JOIN vcdb_sept2016.SpringType stypf 
     ON (stypf.SpringTypeName = src.FrontSpringType) 
    LEFT JOIN vcdb_sept2016.SpringType stypr 
     ON (stypr.SpringTypeName = src.RearSpringType) 
    LEFT JOIN vcdb_sept2016.BrakeSystem bsys 
     ON (bsys.BrakeSystemName = src.BrakeSystem) 
    LEFT JOIN vcdb_sept2016.BrakeABS babs 
     ON (babs.BrakeABSName = src.BrakeABS) 
    LEFT JOIN vcdb_sept2016.SteeringType steertyp 
     ON (steertyp.SteeringTypeName = src.SteeringType) 
    LEFT JOIN vcdb_sept2016.SteeringSystem steersys 
     ON (steersys.SteeringSystemName = src.SteeringSystem) 
    LEFT JOIN vcdb_sept2016.Region regi 
     ON (regi.RegionAbbr = src.Region) 
    LEFT JOIN vcdb_sept2016.EngineVersion ever 
     ON (ever.EngineVersion = src.EngineVersion) 
    LEFT JOIN vcdb_sept2016.Valves valv 
     ON (valv.ValvesPerEngine = src.EngineValves) 
    LEFT JOIN vcdb_sept2016.PowerOutput pout 
     ON (pout.HorsePower = src.PowerOutput) 
    LEFT JOIN vcdb_sept2016.Mfr engMfr 
     ON engMfr.MfrName = src.EngineMfr 
    WHERE NOT EXISTS (SELECT 
     LINE 
    FROM pcdmb_oevierol_oct26_pc75.ValidationErrTempTable temp 
    WHERE temp.LINE = src.LINE 
    AND isUK != 1 
    AND ErrType NOT LIKE 'Warning%')

而且這裏的解釋：

 
id select_type table partitions type possible_keys key key_len ref rows filtered Extra 
1 PRIMARY brand  const PRIMARY PRIMARY 4 const 1 100 Using index 
1 PRIMARY src  ALL     299 100 Using where 
1 PRIMARY vtyp  index  vtyp_x1 52  11 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY pl  ALL BrandId    359 9.94 Using where; Using join buffer (Block Nested Loop) 
1 PRIMARY ebas  index  ebas_x1 65  3710 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY smod  index  smod_x1 52  3574 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY mbco  index  mbco_ix1 12  3865 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY bndo  index  bndo_ix1 3  8 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY btyp  index  btyp_ix1 52  87 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY dtyp  index  dtyp_ix1 32  22 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY pa  ref PART_UK_1,PRODUCT_LINE_ID PART_UK_1 773 pcdmb_oevierol_oct26_pc75.src.PartNumber,pcdmb_oevierol_oct26_pc75.pl.Product_Line_id 1 100 Using where; Using index 
1 PRIMARY bveh  ref IDX_BaseVehicle_MakeID,IDX_BaseVehicle_ModelID,IDX_BaseVehicle_YearID IDX_BaseVehicle_YearID 4 pcdmb_oevierol_oct26_pc75.src.Year 569 100 Using index condition 
1 PRIMARY mak  eq_ref PRIMARY PRIMARY 4 vcdb_sept2016.bveh.MakeID 1 100 Using where 
1 PRIMARY model  eq_ref PRIMARY,IDX_Model_VehicleTypeID PRIMARY 4 vcdb_sept2016.bveh.ModelID 1 100 Using where 
1 PRIMARY edes  index  edes_ix1 32  2645 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY evin  index  evin_ix1 7  91 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY fdty  index  fdty_ix1 52  3 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY fdst  index  fdst_ix1 52  33 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY fsct  index  fsct_ix1 52  5 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY fsde  index  fsde_ix1 52  140 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY fdco  eq_ref fdco_ix1,IDX_FuelDeliveryConfig_FuelDel1,IDX_FuelDeliveryConfig_FuelDel2,IDX_FuelDeliveryConfig_FuelSys3,IDX_FuelDeliveryConfig_FuelSys4 fdco_ix1 16 vcdb_sept2016.fdty.FuelDeliveryTypeID,vcdb_sept2016.fdst.FuelDeliverySubTypeID,vcdb_sept2016.fsct.FuelSystemControlTypeID,vcdb_sept2016.fsde.FuelSystemDesignID 1 100 Using index 
1 PRIMARY aspi  index  aspi_ix1 32  9 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY chty  index  chty_ix1 32  8 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY ftyp  index  ftyp_ix1 32  13 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY isty  index  isty_ix1 32  6 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY transMfr  index  mfr_ix1 32  148 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY ttyp  index  ttyp_ix1 32  5 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY tcty  index  tcty_ix1 32  6 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY tmco  index  tmco_ix1 32  2250 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY tnsp  index  tnsp_ix1 3  13 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY elec  index  econ_ix1 3  5 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY tbas  eq_ref transb_ix1,IDX_TransmissionBase_Transmiss1,IDX_TransmissionBase_Transmiss2,IDX_TransmissionBase_Transmiss3 transb_ix1 12 vcdb_sept2016.ttyp.TransmissionTypeID,vcdb_sept2016.tnsp.TransmissionNumSpeedsID,vcdb_sept2016.tcty.TransmissionControlTypeID 1 100 Using index 
1 PRIMARY blen  index  blen_ix1 10  132 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY bedtyp  index  btyp_ix1 52  8 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY bcon  ref IDX_BedConfig_BedLengthID,IDX_BedConfig_BedTypeID IDX_BedConfig_BedLengthID 4 vcdb_sept2016.blen.BedLengthID 1 100 Using where 
1 PRIMARY wbas  index  wbas_ix1 12  394 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY brtyf  index  btyp_ix1 32  3 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY brtyr  index  btyp_ix1 32  3 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY stypf  index  styp_ix1 52  9 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY stypr  index  styp_ix1 52  9 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY bsys  index  bsys_ix1 32  8 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY babs  index  babs_ix1 32  5 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY steertyp  index  stee_ix1 32  4 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY steersys  index  ssys_ix1 32  4 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY regi  index  regi_ix1 3  3 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY ever  index  ever_ix1 22  117 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY valv  index  valv_ix1 3  24 100 Using where; Using index; Using join buffer (Block Nested Loop) 
1 PRIMARY pout  ALL     1074 100 Using where; Using join buffer (Block Nested Loop) 
1 PRIMARY engMfr  index  mfr_ix1 32  148 100 Using where; Using index; Using join buffer (Block Nested Loop) 
2 DEPENDENT SUBQUERY temp  ALL     10 10 Using where

我ExcelToSQLTemporaryTable（別名：SRC）有大約10000行

在第一種情況下（的MySQL 5.7），這個查詢後不完整2小時，在第二種情況下（MariaDb），此查詢大約需要3分鐘才能完成。問題是我的老闆想要堅持MySQL 5.7，所以我需要一些幫助來獲得與MySQL 5.7中的MariaDB相同的性能。

來源

2016-11-04 Alexandre Labrie

這是一個配置問題。您需要知道**，MySQL使用非常保守的配置，因此它可以在老的，慢速的計算機上工作。找到你的'my.cnf'並查找'innodb_buffer_pool_size'變量的值並增加它。要查看該變量的作用，請將其粘貼到Google中，然後獲取所需的所有信息。即使這個查詢很笨，但它很簡單，因爲它只是很多連接。隨着更大的緩衝池，它應該是快速的。速度還取決於返回的數據量，因爲在網絡上傳輸需要一段時間。 – Mjh

-1

您沒有在mysql表中記錄多少數據（記錄數）。

因爲你說你做索引，所以我假設你做了正確的索引

MySQL是使用不同類型不同目的的數據庫引擎，從查詢中我可以看到你需要InoDb數據庫引擎支持外鍵約束，

映射您的表與一級和外鍵（你用於加入），讓我知道它的速度提高？

來源

2016-11-04 14:11:33

試圖調整我的配置文件很長一段時間，同時優化查詢，僅得到劃痕後，我發現，我加入了數據庫沒有相同的字符集。當我解決這個問題時，一切都像魅力一樣。

來源

2016-12-04 22:39:40

在MySQL 5.7上有很多左連接和索引的查詢很慢

回答

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