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POSQL Query Stuck in Statistics State
 

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  1. POSQL Query Stuck in Statistics State
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    <p>I've been troubleshooting this complex query today, thinking it was a performance issue. It appears that the query is getting stuck into the 'Statistics' state. It is currently in that state for 1300 seconds.</p> <p>I've checked the indexes for the tables involved -- I've optimized the table -- what could be causing this hang?</p> <pre><code>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 ', '), GROUP_CONCAT(DISTINCT(EngineVersion.EngineVersion) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(Valves.ValvesPerEngine) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(BedLength.BedLength) SEPARATOR ', '), GROUP_CONCAT(DISTINCT(BedLength.BedLengthMetric) 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 INNER JOIN EngineVersion ON EngineConfig.EngineVersionID=EngineVersion.EngineVersionID INNER JOIN Valves ON EngineConfig.ValvesID=Valves.Valvesid INNER JOIN VehicleToBedConfig ON Vehicle.VehicleID=VehicleToBedConfig.VehicleID INNER JOIN BedConfig ON VehicleToBedConfig.BedConfigID=BedConfig.BedConfigID INNER JOIN BedLength ON BedConfig.BedLengthID=BedLength.BedLengthID GROUP BY part_id </code></pre>
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    1. USBrian Schroeter
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      1. POSQL Query Stuck in Statistics State
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    1. CO**Q:** Have you run an `EXPLAIN` to get details on the execution plan? If any of these are MyISAM tables, I'd recommend a `CHECK TABLE x;` If any problems are reported, then `REPAIR TABLE x;` (BUT BEWARE: this could result in data loss. It's advisable to take a cold backup of the table, as well as a mysqldump of the table, before the repair) and gather statistics with `ANALYZE TABLE x;`.
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      1. USspencer7593
    2. COI have been doing so, yes. I thought it was a query issue so I added JOIN by JOIN to see where the issue was. Right now I'm trying to run EXPLAIN SELECT on this query and it's at 100 seconds (thus far) in Statistics.
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      1. USBrian Schroeter
    3. COsounds like MySQL may be cranking to gather statistics on the tables and indexes.
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      1. USspencer7593
 

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