.net 没有注意到太多的细节和表达。我的经验法则是将它用于OLTP和key访问类型的操作，并将聚合和不明显的内容（无论这意味着什么）留给procedurest。这解决了性能问题。现在你建议的LINQ的查询比我手工制作的视图还要快。1） SQL视图==>SQL Se
.net 没有注意到太多的细节和表达。我的经验法则是将它用于OLTP和key访问类型的操作，并将聚合和不明显的内容（无论这意味着什么）留给procedurest。这解决了性能问题。现在你建议的LINQ的查询比我手工制作的视图还要快。1） SQL视图==>SQL Se,.net,sql-server,linq,entity-framework-6,.net,Sql Server,Linq,Entity Framework 6,没有注意到太多的细节和表达。我的经验法则是将它用于OLTP和key访问类型的操作，并将聚合和不明显的内容（无论这意味着什么）留给procedurest。这解决了性能问题。现在你建议的LINQ的查询比我手工制作的视图还要快。1） SQL视图==>SQL Server执行时间：CPU时间=31毫秒，运行时间=28毫秒。2）LINQ==>SQL Server执行时间：CPU时间=15毫秒，运行时间=12毫秒。3）错误LINQ==>SQL Server执行时间：CPU时间=594毫秒，经过的时间=282
没有注意到太多的细节和表达。我的经验法则是将它用于OLTP和key访问类型的操作，并将聚合和不明显的内容（无论这意味着什么）留给procedurest。这解决了性能问题。现在你建议的LINQ的查询比我手工制作的视图还要快。1） SQL视图==>SQL Server执行时间：CPU时间=31毫秒，运行时间=28毫秒。2）LINQ==>SQL Server执行时间：CPU时间=15毫秒，运行时间=12毫秒。3）错误LINQ==>SQL Server执行时间：CPU时间=594毫秒，经过的时间=282毫秒。是否有可能解释一下坏LINQ和好LINQ生成的内容？主要区别在于，如果搜索“坏”查询，则[dbo].[DollarU_JobRuns]与“好”查询中的2相比有4个
。
var today = DateTime.Today;
var month = new DateTime(today.Year, today.Month, 1);
var first = month.AddMonths(-1);
var last = month.AddDays(-1);
var baseQuery = (from jr in DollarU_JobRuns
where (jr.Day >= first && jr.Day <= last)
group jr by new { System = jr.SYSU.Substring(0, 2) }
into systemGroup
let NbrOfJobRunsSucceeded = systemGroup.Sum(x => x.NbrOfJobRunsSucceeded)
let NbrOfJobRunsFailed = systemGroup.Sum(s => s.NbrOfJobRunsFailed)
select new
{
System = systemGroup.Key.System,
NbrOfJobRunsSucceeded,
NbrOfJobRunsFailed,
Total = NbrOfJobRunsSucceeded + NbrOfJobRunsFailed
}).OrderByDescending(item => item.Total);
var query = baseQuery.Take(10).Concat(
baseQuery.Skip(10).Select(item => new
{
System = "Others",
NbrOfJobRunsSucceeded = item.NbrOfJobRunsSucceeded,
NbrOfJobRunsFailed = item.NbrOfJobRunsFailed,
Total = item.NbrOfJobRunsSucceeded + item.NbrOfJobRunsFailed,
}
)
)
.GroupBy(g => g.System)
.Select(
g => new
{
System = g.Key,
NbrOfJobRunsSucceeded = g.Sum(x => x.NbrOfJobRunsSucceeded),
NbrOfJobRunsFailed = g.Sum(x => x.NbrOfJobRunsFailed),
Total = g.Sum(x => x.Total)
}
)
.OrderByDescending(item => item.Total);
query.Dump();
SELECT
[Project9].[C5] AS [C1],
[Project9].[C4] AS [C2],
[Project9].[C1] AS [C3],
[Project9].[C2] AS [C4],
[Project9].[C3] AS [C5]
FROM ( SELECT
[GroupBy5].[A1] AS [C1],
[GroupBy5].[A2] AS [C2],
[GroupBy5].[A3] AS [C3],
[GroupBy5].[K1] AS [C4],
1 AS [C5]
FROM ( SELECT
[UnionAll1].[C1] AS [K1],
SUM([UnionAll1].[C2]) AS [A1],
SUM([UnionAll1].[C3]) AS [A2],
SUM([UnionAll1].[C4]) AS [A3]
FROM (SELECT TOP (10)
[Project3].[C2] AS [C1],
[Project3].[C1] AS [C2],
[Project3].[C4] AS [C3],
[Project3].[C3] AS [C4]
FROM ( SELECT
[Project2].[C1] AS [C1],
[Project2].[C2] AS [C2],
[Project2].[C1] + [Project2].[C3] AS [C3],
[Project2].[C3] AS [C4]
FROM ( SELECT
[Project1].[C1] AS [C1],
[Project1].[C2] AS [C2],
(SELECT
SUM([Extent2].[NbrOfJobRunsFailed]) AS [A1]
FROM [dbo].[DollarU_JobRuns] AS [Extent2]
WHERE ([Extent2].[Day] >= '2017-09-01') AND ([Extent2].[Day] <= '2017-09-30') AND (([Project1].[C2] = (SUBSTRING([Extent2].[SYSU], 0 + 1, 2))) OR (([Project1].[C2] IS NULL) AND (SUBSTRING([Extent2].[SYSU], 0 + 1, 2) IS NULL)))) AS [C3]
FROM ( SELECT
[GroupBy1].[A1] AS [C1],
[GroupBy1].[K1] AS [C2]
FROM ( SELECT
[Filter1].[K1] AS [K1],
SUM([Filter1].[A1]) AS [A1]
FROM ( SELECT
SUBSTRING([Extent1].[SYSU], 0 + 1, 2) AS [K1],
[Extent1].[NbrOfJobRunsSucceeded] AS [A1]
FROM [dbo].[DollarU_JobRuns] AS [Extent1]
WHERE ([Extent1].[Day] >= '2017-09-01') AND ([Extent1].[Day] <= '2017-09-30')
) AS [Filter1]
GROUP BY [K1]
) AS [GroupBy1]
) AS [Project1]
) AS [Project2]
) AS [Project3]
ORDER BY [Project3].[C3] DESC
UNION ALL
SELECT
[Project7].[C3] AS [C1],
[Project7].[C1] AS [C2],
[Project7].[C5] AS [C3],
[Project7].[C4] AS [C4]
FROM ( SELECT
[Project6].[C1] AS [C1],
[Project6].[C1] + [Project6].[C2] AS [C2],
N'Others' AS [C3],
[Project6].[C1] + [Project6].[C2] AS [C4],
[Project6].[C2] AS [C5]
FROM ( SELECT
[Project5].[C1] AS [C1],
(SELECT
SUM([Extent4].[NbrOfJobRunsFailed]) AS [A1]
FROM [dbo].[DollarU_JobRuns] AS [Extent4]
WHERE ([Extent4].[Day] >= '2017-09-01') AND ([Extent4].[Day] <= '2017-09-30') AND (([Project5].[C2] = (SUBSTRING([Extent4].[SYSU], 0 + 1, 2))) OR (([Project5].[C2] IS NULL) AND (SUBSTRING([Extent4].[SYSU], 0 + 1, 2) IS NULL)))) AS [C2]
FROM ( SELECT
[GroupBy3].[A1] AS [C1],
[GroupBy3].[K1] AS [C2]
FROM ( SELECT
[Filter3].[K1] AS [K1],
SUM([Filter3].[A1]) AS [A1]
FROM ( SELECT
SUBSTRING([Extent3].[SYSU], 0 + 1, 2) AS [K1],
[Extent3].[NbrOfJobRunsSucceeded] AS [A1]
FROM [dbo].[DollarU_JobRuns] AS [Extent3]
WHERE ([Extent3].[Day] >= '2017-09-01') AND ([Extent3].[Day] <= '2017-09-30')
) AS [Filter3]
GROUP BY [K1]
) AS [GroupBy3]
) AS [Project5]
) AS [Project6]
) AS [Project7]
ORDER BY [Project7].[C2] DESC
OFFSET 10 ROWS ) AS [UnionAll1]
GROUP BY [UnionAll1].[C1]
) AS [GroupBy5]
) AS [Project9]
ORDER BY [Project9].[C3] DESC
With TopItems As
(
SELECT SUBSTRING( [SYSU],1,2) AS [System]
, Sum([NbrOfJobRunsSucceeded]) AS NbrOfJobRunsSucceeded
, Sum([NbrOfJobRunsFailed]) AS NbrOfJobRunsFailed
, Sum([NbrOfJobRunsSucceeded] + [NbrOfJobRunsFailed]) AS Total
, ROW_NUMBER() OVER (ORDER BY Sum([NbrOfJobRunsSucceeded] + [NbrOfJobRunsFailed]) DESC) AS Num
FROM [dbo].[DollarU_JobRuns]
WHERE [Day] >= DATEADD(month, -1, DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))
AND [Day] < DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)
GROUP BY SUBSTRING( [SYSU],1,2)
)
SELECT [System], NbrOfJobRunsSucceeded, NbrOfJobRunsFailed, Total
FROM TopItems
WHERE Num <= 10
UNION ALL
SELECT
'Others'
, Sum([NbrOfJobRunsSucceeded]) AS NbrOfJobRunsSucceeded
, Sum([NbrOfJobRunsFailed]) AS NbrOfJobRunsFailed
, Sum(Total)
FROM TopItems
WHERE Num > 10
var baseQuery = DollarU_JobRuns
.Where(jr => jr.Day >= first && jr.Day <= last)
.GroupBy(jr => new { System = jr.SYSU.Substring(0, 2) })
.Select(systemGroup => new
{
System = systemGroup.Key.System,
NbrOfJobRunsSucceeded = systemGroup.Sum(x => x.NbrOfJobRunsSucceeded),
NbrOfJobRunsFailed = systemGroup.Sum(x => x.NbrOfJobRunsFailed),
})
.Select(item => new
{
item.System,
item.NbrOfJobRunsSucceeded,
item.NbrOfJobRunsFailed,
Total = item.NbrOfJobRunsFailed + item.NbrOfJobRunsFailed
})
.OrderByDescending(item => item.Total);