我目前在MSSQL中有一个存储过程,根据我给存储过程的变量多次执行SELECT语句。存储过程计算用户可以启用的每个过滤器将返回多少结果。 存储过程不是问题,我从转化TE存储过程中的SELECT语句为常规的选择语句,它看起来像:更大的结果集的性能问题MSSQL
DECLARE @contentRootId int = 900589
DECLARE @RealtorIdList varchar(2000) = ';880;884;1000;881;885;'
DECLARE @publishSoldOrRentedSinceDate int = 8
DECLARE @isForSale BIT= 1
DECLARE @isForRent BIT= 0
DECLARE @isResidential BIT= 1
--...(another 55 variables)...
--Table to be returned
DECLARE @resultTable TABLE
(
variableName varchar(100),
[value] varchar(200)
)
-- Create table based of inputvariable. Example: turns ';18;118;' to a table containing two ints 18 AND 118
DECLARE @RealtorIdTable table(RealtorId int)
INSERT INTO @RealtorIdTable SELECT * FROM dbo.Split(@RealtorIdList,';') option (maxrecursion 150)
INSERT INTO @resultTable ([value], variableName)
SELECT [Value], VariableName FROM(
Select count(*) as TotalCount,
ISNULL(SUM(CASE WHEN reps.ForRecreation = 1 THEN 1 else 0 end), 0) as ForRecreation,
ISNULL(SUM(CASE WHEN reps.IsQualifiedForSeniors = 1 THEN 1 else 0 end), 0) as IsQualifiedForSeniors,
--...(A whole bunch more SUM(CASE)...
FROM TABLE1 reps
LEFT JOIN temp t on
t.ContentRootID = @contentRootId
AND t.RealEstatePropertyID = reps.ID
WHERE
(EXISTS(select 1 from @RealtorIdTable where RealtorId = reps.RealtorID))
AND (@SelectedGroupIds IS NULL OR EXISTS(select 1 from @SelectedGroupIdtable where GroupId = t.RealEstatePropertyGroupID))
AND (ISNULL(reps.IsForSale,0) = ISNULL(@isForSale,0))
AND (ISNULL(reps.IsForRent, 0) = ISNULL(@isForRent,0))
AND (ISNULL(reps.IsResidential, 0) = ISNULL(@isResidential,0))
AND (ISNULL(reps.IsCommercial, 0) = ISNULL(@isCommercial,0))
AND (ISNULL(reps.IsInvestment, 0) = ISNULL(@isInvestment,0))
AND (ISNULL(reps.IsAgricultural, 0) = ISNULL(@isAgricultural,0))
--...(Around 50 more of these WHERE-statements)...
) as tbl
UNPIVOT (
[Value]
FOR [VariableName] IN(
[TotalCount],
[ForRecreation],
[IsQualifiedForSeniors],
--...(All the other things i selected in above query)...
)
) as d
select * from @resultTable
一个Realtor-和内容识别的结合,给我的一组默认设置X数量的记录。当我选择组合给我〜4600条记录时,执行时间大约为250ms。当我用一个给我〜600条记录的组合执行sattement时,执行时间约为20ms。
我想知道为什么会发生这种情况。我尝试删除所有SUM(CASE中的select,我试着从WHERE子句中删除了几乎所有的东西,并且我尝试删除JOIN。但是我一直看到4600和600的结果集之间的巨大差异。
检查参数嗅探并添加'OPTION(RECOMPILE)'。你也可以更新你的表上的统计。 se提供两种情况下的执行计划 – Devart
我不确定你的意思是“你也可以更新你的表上的统计信息”。我尝试了参数嗅探,它有帮助,但不是很多。我会检查选项(RECOMPILE) – user2939331
'ISNULL(reps.IsForSale,0)= ISNULL(@ isForSale,0)' - 这些'isnull's也是问题。你最好把它改写成'(@ isforsale is null或isforsale = @ isforsale)'+重新编译 –