The wait operation timed out

Question

I am getting error The wait opertaion timed out but when i get run linq query to Sql it will run in 5 sec.
And also tried with increasing timeout to 10*60 .
My Sql query is
SELECT
    [Project5].[C7] AS [C1],
    [Project5].[C6] AS [C2],
    [Project5].[C5] AS [C3],
    [Project5].[C1] AS [C4],
    [Project5].[C11] AS [C5],
    [Project5].[C2] AS [C6],
    [Project5].[C3] AS [C7],
    [Project5].[C8] AS [C8],
    [Project5].[C4] AS [C9],
    [Project5].[C9] AS [C10],
    [Project5].[C10] AS [C11]
    FROM ( SELECT
        [GroupBy1].[A1] AS [C1],
        [GroupBy1].[A2] AS [C2],
        [GroupBy1].[A3] AS [C3],
        [GroupBy1].[A4] AS [C4],
        [GroupBy1].[K1] AS [C5],
        [GroupBy1].[K2] AS [C6],
        1 AS [C7],
        CASE WHEN ([Project4].[C6] IS NULL) THEN CAST(NULL AS float) ELSE ROUND( CAST( [Project4].[C2] AS float), 2) END AS [C8],
        CASE WHEN ([Project4].[C6] IS NULL) THEN CAST(NULL AS float) ELSE ROUND( CAST( [Project4].[C3] AS float), 2) END AS [C9],
        CASE WHEN ([Project4].[C6] IS NULL) THEN CAST(NULL AS float) ELSE ROUND( CAST( [Project4].[C4] AS float), 2) END AS [C10],
        [Project4].[C5] AS [C11]
        FROM   (SELECT
            [Filter1].[K1] AS [K1],
            [Filter1].[K2] AS [K2],
            [Filter1].[K3] AS [K3],
            COUNT([Filter1].[A1]) AS [A1],
            SUM([Filter1].[A2]) AS [A2],
            SUM([Filter1].[A3]) AS [A3],
            SUM([Filter1].[A4]) AS [A4]
            FROM ( SELECT
                CASE WHEN (1 = 1) THEN [Extent3].[CostCentreDescription] ELSE [Extent4].[DepartmentDescription] END AS [K1],
                CASE WHEN (1 = 1) THEN [Extent3].[CostCentreGUID] ELSE [Extent5].[DepartmentGUID] END AS [K2],
                CASE WHEN (1 = 1) THEN [Extent1].[CostCentreID] ELSE [Extent1].[DepartmentID] END AS [K3],
                1 AS [A1],
                [Extent1].[ProRata] AS [A2],
                [Extent1].[MonthLineRental] AS [A3],
                [Extent1].[TotalCost] AS [A4]
                FROM     [dbo].[InvoiceCTN] AS [Extent1]
                LEFT OUTER JOIN [dbo].[Department] AS [Extent2] ON [Extent1].[DepartmentID] = [Extent2].[DepartmentID]
                INNER JOIN [dbo].[CostCentre] AS [Extent3] ON [Extent1].[CostCentreID] = [Extent3].[CostCentreID]
                LEFT OUTER JOIN [dbo].[Department] AS [Extent4] ON [Extent1].[DepartmentID] = [Extent4].[DepartmentID]
                LEFT OUTER JOIN [dbo].[Department] AS [Extent5] ON [Extent1].[DepartmentID] = [Extent5].[DepartmentID]
                WHERE ([Extent1].[InvoiceDateID] = 16) AND (0 = 0 OR 0 =  CAST( [Extent2].[DepartmentType] AS int))
            )  AS [Filter1]
            GROUP BY [K1], [K2], [K3] ) AS [GroupBy1]
        LEFT OUTER JOIN  (SELECT
            [Project3].[C1] AS [C1],
            [Project3].[C2] AS [C2],
            [Project3].[C3] AS [C3],
            [Project3].[C4] AS [C4],
            [Project3].[C5] AS [C5],
            1 AS [C6]
            FROM ( SELECT
                [Project2].[C1] AS [C1],
                [Project2].[C2] AS [C2],
                [Project2].[C3] AS [C3],
                [Project2].[C4] AS [C4],
                (SELECT
                    COUNT(1) AS [A1]
                    FROM ( SELECT [Extent11].[InvoiceDateID] AS [InvoiceDateID1], [Extent12].[DepartmentType] AS [DepartmentType1], [Extent14].[CostCentreGUID] AS
[CostCentreGUID], [Extent15].[DepartmentGUID] AS [DepartmentGUID1]
                        FROM     [dbo].[InvoiceCTN] AS [Extent11]
                        LEFT OUTER JOIN [dbo].[Department] AS [Extent12] ON [Extent11].[DepartmentID] = [Extent12].[DepartmentID]
                        INNER JOIN [dbo].[InvoiceCTNItemised] AS [Extent13] ON (([Extent11].[MobileNumber] = [Extent13].[MobileNumber]) OR (([Extent11].[MobileNumber]
IS NULL) AND ([Extent13].[MobileNumber] IS NULL))) AND (([Extent11].[InvoiceDateID] = [Extent13].[InvoiceDateID]) OR (([Extent11].[InvoiceDateID] IS NULL) AND ([Extent13].[InvoiceDateID] IS NULL)))
                        INNER JOIN [dbo].[CostCentre] AS [Extent14] ON [Extent11].[CostCentreID] = [Extent14].[CostCentreID]
                        LEFT OUTER JOIN [dbo].[Department] AS [Extent15] ON [Extent11].[DepartmentID] = [Extent15].[DepartmentID]
                        WHERE 'SMS' = [Extent13].[CallType]
                    )  AS [Filter3]
                    WHERE ([Filter3].[InvoiceDateID1] = 16) AND (0 = 0 OR 0 =  CAST( [Filter3].[DepartmentType1] AS int)) AND (([Project2].[C1] = (CASE WHEN
(1 = 1) THEN [Filter3].[CostCentreGUID] ELSE [Filter3].[DepartmentGUID1] END)) OR (([Project2].[C1] IS NULL) AND (CASE WHEN (1 = 1) THEN [Filter3].[CostCentreGUID] ELSE [Filter3].[DepartmentGUID1] END IS NULL)))) AS [C5]
                FROM ( SELECT
                    [GroupBy2].[K1] AS [C1],
                    [GroupBy2].[A1] AS [C2],
                    [GroupBy2].[A2] AS [C3],
                    [GroupBy2].[A3] AS [C4]
                    FROM ( SELECT
                        [Project1].[K1] AS [K1],
                        SUM([Project1].[A1]) AS [A1],
                        SUM([Project1].[A2]) AS [A2],
                        SUM([Project1].[A3]) AS [A3]
                        FROM ( SELECT
                            CASE WHEN (1 = 1) THEN [Project1].[CostCentreGUID] ELSE [Project1].[DepartmentGUID] END AS [K1],
                            CASE WHEN ([Project1].[UsageCharge] IS NOT NULL) THEN [Project1].[UsageCharge] ELSE cast(0 as
decimal(18)) END AS [A1],
                            (CASE WHEN ([Project1].[DataVolume] IS NOT NULL) THEN [Project1].[DataVolume] ELSE cast(0 as decimal(18))
END) / cast(1048576 as decimal(18)) AS [A2],
                            CASE WHEN ([Project1].[Minutes] IS NOT NULL) THEN [Project1].[Minutes] ELSE cast(0 as decimal(18))
END AS [A3]
                            FROM ( SELECT
                                [Extent8].[Minutes] AS [Minutes],
                                [Extent8].[DataVolume] AS [DataVolume],
                                [Extent8].[UsageCharge] AS [UsageCharge],
                                [Extent9].[CostCentreGUID] AS [CostCentreGUID],
                                [Extent10].[DepartmentGUID] AS [DepartmentGUID]
                                FROM     [dbo].[InvoiceCTN] AS [Extent6]
                                LEFT OUTER JOIN [dbo].[Department] AS [Extent7] ON [Extent6].[DepartmentID]
= [Extent7].[DepartmentID]
                                LEFT OUTER JOIN [dbo].[InvoiceCTNItemised] AS [Extent8] ON (([Extent6].[MobileNumber]
= [Extent8].[MobileNumber]) OR (([Extent6].[MobileNumber] IS NULL) AND ([Extent8].[MobileNumber] IS NULL))) AND (([Extent6].[InvoiceDateID] = [Extent8].[InvoiceDateID]) OR (([Extent6].[InvoiceDateID] IS NULL) AND ([Extent8].[InvoiceDateID] IS NULL)))
                                INNER JOIN [dbo].[CostCentre] AS [Extent9] ON [Extent6].[CostCentreID]
= [Extent9].[CostCentreID]
                                LEFT OUTER JOIN [dbo].[Department] AS [Extent10] ON [Extent6].[DepartmentID]
= [Extent10].[DepartmentID]
                                WHERE ([Extent6].[InvoiceDateID] = 16) AND (0 = 0 OR 0 =  CAST( [Extent7].[DepartmentType]
AS int))
                            )  AS [Project1]
                        )  AS [Project1]
                        GROUP BY [K1]
                    )  AS [GroupBy2]
                )  AS [Project2]
            )  AS [Project3] ) AS [Project4] ON ([GroupBy1].[K2] = [Project4].[C1]) OR (([GroupBy1].[K2] IS NULL) AND ([Project4].[C1] IS NULL))
    )  AS [Project5]
    ORDER BY [Project5].[C4] DESC
and the C# code is
 public DataTable GetCTNInvoiceLoadGroupByLinkSource(string LinkType, int DepartmentTypeID, int InvoiceDateID, int UserID, bool showAll = false)
            bool IsLinkTypeCostCentre = LinkType == "CostCentre" ? true : false;
            var q1 = (from inv in db.InvoiceCTNs.AsNoTracking()
                          where inv.InvoiceDateID == InvoiceDateID && (DepartmentTypeID == 0 || inv.Department.DepartmentType
== DepartmentTypeID)
                          select inv);
            if (!showAll)
                q1 = (from inv in q1
                      join ulr in db.UserLinkRels.AsNoTracking() on new { ID = (isCostCentre ? inv.CostCentreID : inv.DepartmentID) } equals new { ID =
ulr.LinkID }
                         where ulr.UserID == UserID
                         select inv);
            var q2 = (from inv in q1
                      join invCTNItem in db.InvoiceCTNItemiseds.AsNoTracking() on new { inv.MobileNumber, inv.InvoiceDateID } equals new { invCTNItem.MobileNumber,
invCTNItem.InvoiceDateID } into g_join
                      from invCTNItem in g_join.DefaultIfEmpty()
                      select new{inv,invCTNItem});
            #region GroupBy
            var InvoiceCTN_GroupBy = (from inv in q1
                                      group inv by new { Description = (IsLinkTypeCostCentre
? inv.CostCentre.CostCentreDescription : inv.Department.DepartmentDescription), GUID = (IsLinkTypeCostCentre ? inv.CostCentre.CostCentreGUID : inv.Department.DepartmentGUID), ID = (IsLinkTypeCostCentre ? inv.CostCentreID : inv.DepartmentID) } into g
                                      select new
                                          GUID = g.Key.GUID,
                                          Description
= g.Key.Description,
                                          Count = g.Count(),
                                          ProRata =
g.Sum(inv => inv.ProRata),
                                          AgreedLineRental
= g.Sum(inv => inv.MonthLineRental),
                                          TotalCost
= g.Sum(inv => inv.TotalCost)
            var InvoiceCTNItemised_GroupBy = (from g in q2
group g.invCTNItem by new { Guid = (IsLinkTypeCostCentre ? g.inv.CostCentre.CostCentreGUID : g.inv.Department.DepartmentGUID) } into g
select new
GUID = g.Key.Guid,
EligibleSMS = g.Count(i => i.CallType == "SMS"),
TotalUsageCost = Math.Round((double)(g.Sum(i => (i.UsageCharge != null ? i.UsageCharge : default(decimal)))), 2),
EligibleData = Math.Round((double)(g.Sum(i => (i.DataVolume != null ? i.DataVolume : default(decimal)) / 1048576)), 2),
EligibleMinutes = Math.Round((double)(g.Sum(i => (i.Minutes != null ? i.Minutes : default(decimal)))), 2),
            #endregion
            var q_join = (from q_1 in InvoiceCTN_GroupBy
                          join q_2 in InvoiceCTNItemised_GroupBy
                          on q_1.GUID equals q_2.GUID into g
                          from q_2 in g.DefaultIfEmpty()
                          select new
                              GUID = q_1.GUID,
                              Description = q_1.Description,
                              Count = q_1.Count,
                              q_2.EligibleSMS,
                              q_1.ProRata,
                              q_1.AgreedLineRental,
                              q_2.TotalUsageCost,
                              q_1.TotalCost,
                              q_2.EligibleData,
                              q_2.EligibleMinutes
                          }).OrderByDescending(g => g.TotalCost);
                return q_join.ToList().ToDataTable();

Answer 1

Hello Rohit.sindhu90,
>> I am getting error The wait opertaion timed out but when i get run linq query to Sql it will run in 5 sec.
Could you please tell which line causes this exception and what the details exception message is? Currently, it is hard to know why you encounter the timeout exception.
>> And also tried with increasing timeout to 10*60.
Since it is not clear if you encounter the connection timeout:
https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectiontimeout(v=vs.110).aspx or command timeout:
https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout(v=vs.110).aspx, I suggest that you could both set them to be a longer value as 1800s. And from your provided code, your query is a complex query and if your data is
large, it may take more than 10*60 time. You could first reduce the amount of query data to see if it is caused by the amount of data is too large.
Regards.
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