Hello! I am running a query which is taking 23 mins to run in my dev server. I need your expert advice on how to improve the performance. I can change the architecture a little bit as it is still in dev environment. declare @market varchar(5), @EIA_plant_id int = 999999, @EIA_unit_id varchar(16) = '0000', @data_type int, @startdate datetime, @enddate datetime, @starthour int, @endhour int set @market = N'DA',set @data_type = 0set @startdate = N'2015-12-01'set @enddate = N'2015-12-10'set @starthour = 0set @endhour = 23 -- DA Raw IF @market = 'DA' and @data_type = 0 BEGIN SELECT --CASE WHEN max(gb.bidding_group_id) is not null or @EIA_unit_id != '0000' THEN min(gu.unit_id) ELSE max(gu.unit_id) END as unit_id, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN max(gu.unit_name) ELSE max(gb.bidding_group_name) END as unit_name ,max(gu.[EIA_plant_code]) as EIA_plant_ID ,CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN max(gu.eia_unit_id) ELSE NULL END as EIA_unit_ID, max(br.Region) as region, --max(br.[Owner Code]) as owner_code, --br.[Unit Code] as bid_code_id, max(br.[Unit Type]) as unit_type_code, br.[Date Time Beginning (est)] AS [date_beginning_EST], max(br.price1) AS bid1, max(br.price2) AS bid2, max(br.price3) AS bid3, max(br.price4) AS bid4, max(br.price5) AS bid5, max(br.price6) AS bid6, max(br.price7) AS bid7, max(br.price8) AS bid8, max(br.price9) AS bid9, max(br.price10) AS bid10, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw1)) ELSE max(br.mw1) END AS MW1, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw2)) ELSE max(br.mw2) END AS MW2, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw3)) ELSE max(br.mw3) END AS MW3, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw4)) ELSE max(br.mw4) END AS MW4, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw5)) ELSE max(br.mw5) END AS MW5, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw6)) ELSE max(br.mw6) END AS MW6, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw7)) ELSE max(br.mw7) END AS MW7, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw8)) ELSE max(br.mw8) END AS MW8, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw9)) ELSE max(br.mw9) END AS MW9, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.mw10)) ELSE max(br.mw10) END AS MW10, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[economic min])) ELSE max(br.mw1) END AS economic_min, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[economic max])) ELSE max(br.mw1) END AS economic_max, max(convert(decimal(4,2),br.[Slope])) AS slope, max(convert(decimal(4,2),br.[Must Run Flag])) AS must_run_flag, max(convert(decimal(4,2),br.[Unit Available Flag])) AS unit_available_flag, max(br.[LMP]) AS LMP_hourly, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[MW])) ELSE max(br.[MW]) END AS MW_hourly, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[Self Scheduled MW])) ELSE max(br.[Self Scheduled MW]) END AS MW_self_schedule, max(convert(decimal(4,2),br.[Economic Flag])) AS economic_flag, max(convert(decimal(4,2),br.[Emergency Flag])) AS emergency_flag, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[Emergency Min])) ELSE max(br.[Emergency Min]) END AS emergency_min, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[Emergency Max])) ELSE max(br.[Emergency Max]) END AS emergency_max, CASE WHEN max(gb.bidding_group_id) is null or @EIA_unit_id != '0000' THEN convert(decimal(6,2),max(uGen.[weight] * br.[Target MW Reduction])) ELSE max(br.[Target MW Reduction]) END AS target_MW_reduction, max(br.[Curtailment Offer Price]) AS curtailment_offer_price --max(gu.bidding_group_id) as bid_group_id, --max(uGen.[weight]) as UC_weight --max(CONVERT(int,br.bitDataChecked)) AS bit_data_checked, FROM dbo.global_unit gu INNER JOINdbo.unit_to_gennode AS uGen ON uGen.unit_id=gu.unit_id INNER JOIN dbo.gennode_to_unit_code AS guCode ON uGen.gennode = guCode.gennode INNER JOIN dbo.bids_raw_da_ AS br ON guCode.unit_code = br.[Unit Code] --THIS TABLE HAS 30 million woes LEFT JOIN dbo.global_bidding_group gb on gb.bidding_group_id = gu.bidding_group_id WHERE @EIA_plant_id = CASE WHEN @EIA_plant_id != 999999 THEN gu.EIA_plant_code ELSE 999999 END AND @EIA_unit_id = CASE WHEN @EIA_unit_id != '0000' THEN gu.EIA_unit_id ELSE '0000' END --AND (bitDataChecked = 1 or bitDataChecked = 0) AND [Date Time Beginning (est)] >= @startdate AND [Date Time Beginning (est)] <= @enddate AND datepart(hour, br.[Date Time Beginning (EST)]) >= @starthour and datepart(hour, br.[Date Time Beginning (EST)]) <= @endhour --AND starthour >= @starthour -- i tried to add persisted computed columns on Date Time Beginning (est). no luck. --AND starthour<= @endhour GROUP BY CASE WHEN gb.bidding_group_id is not null THEN gb.bidding_group_id ELSE gu.unit_id END, [Date Time Beginning (EST)], [Unit Code] ORDER BY max(gu.unit_id), date_beginning_EST, [Unit Code] --option(hash join,merge join) END What are the things i should change to make it run it better. please help.
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