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POEXPLAIN SELECT Shows Type as ALL (SQL)
 

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  1. POEXPLAIN SELECT Shows Type as ALL (SQL)
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    <p>I'm troubleshooting the performance of a rather complex SQL query I have here. When I run the following command, the results are outlined below...</p> <pre><code>EXPLAIN SELECT Import_Values.id, Import_Values.part_id, Import_Values.qty, Import_Values.note, Parts.partterminologyname, GROUP_CONCAT(BaseVehicle.YearID, ' ', Make.MakeName, ' ', Model.modelname, ' ', SubModel.SubModelName SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineDesignation.EngineDesignationName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineVIN.EngineVINName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.Liter) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.CC) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.CID) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.Cylinders) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.BlockType) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.EngBoreIn) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.EngBoreMetric) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.EngStrokeIn) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(EngineBase.EngStrokeMetric) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(FuelDeliveryType.FuelDeliveryTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(FuelDeliverySubType.FuelDeliverySubTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(FuelSystemControlType.FuelSystemControlTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(FuelSystemDesign.FuelSystemDesignName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(Aspiration.AspirationName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(CylinderHeadType.CylinderHeadTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(FuelType.FuelTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(IgnitionSystemType.IgnitionSystemTypeName) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(Mfr.MfrName) SEPARATOR ', ') FROM Import_Values INNER JOIN BaseVehicle ON Import_Values.base_vehicle_id=BaseVehicle.BaseVehicleID INNER JOIN Parts ON Import_Values.part_type_id=Parts.PartTerminologyID INNER JOIN Make ON BaseVehicle.MakeID=Make.MakeID INNER JOIN Model ON BaseVehicle.ModelID=Model.ModelID INNER JOIN Vehicle ON Import_Values.base_vehicle_id=Vehicle.BaseVehicleID INNER JOIN SubModel ON Vehicle.SubModelID=SubModel.SubModelID INNER JOIN VehicleToEngineConfig ON Vehicle.VehicleID=VehicleToEngineConfig.VehicleID INNER JOIN EngineConfig ON VehicleToEngineConfig.EngineConfigID=EngineConfig.EngineConfigID INNER JOIN EngineDesignation ON EngineConfig.EngineDesignationID=EngineDesignation.EngineDesignationID INNER JOIN EngineVIN ON EngineConfig.EngineVINID=EngineVIN.EngineVINID INNER JOIN EngineBase ON EngineConfig.EngineBaseID=EngineBase.EngineBaseID INNER JOIN FuelDeliveryConfig ON EngineConfig.FuelDeliveryConfigID=FuelDeliveryConfig.FuelDeliveryConfigID INNER JOIN FuelDeliveryType ON FuelDeliveryConfig.FuelDeliveryTypeID=FuelDeliveryType.FuelDeliveryTypeID INNER JOIN FuelDeliverySubType ON FuelDeliveryConfig.FuelDeliverySubTypeID=FuelDeliverySubType.FuelDeliverySubTypeID INNER JOIN FuelSystemControlType ON FuelDeliveryConfig.FuelSystemControlTypeID=FuelSystemControlType.FuelSystemControlTypeID INNER JOIN FuelSystemDesign ON FuelDeliveryConfig.FuelSystemDesignID=FuelSystemDesign.FuelSystemDesignID INNER JOIN Aspiration ON EngineConfig.AspirationID=Aspiration.AspirationID INNER JOIN CylinderHeadType ON EngineConfig.CylinderHeadTypeID=CylinderHeadType.CylinderHeadTypeID INNER JOIN FuelType ON EngineConfig.FuelTypeID=FuelType.FuelTypeID INNER JOIN IgnitionSystemType ON EngineConfig.IgnitionSystemTypeID=IgnitionSystemType.IgnitionSystemTypeID INNER JOIN Mfr ON EngineConfig.EngineMfrID=Mfr.MfrID GROUP BY part_id </code></pre> <p>The results indicate that the table Import_Values has 147377 rows and the type is 'ALL' and FuelDeliveryType has 3 rows and the type is 'ALL'. From what I've read, the 'ALL' type leads to poor performance.</p> <p>I've added an index but it still says 'ALL' -- is there something else I must do?</p> <p>Thanks!</p>
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