Question

在本地开发机器上，我的查询在通过网站运行时无限期地超时（ASP.NET - ADO.NET）相同的查询昨天正好运行。当我从本地机器执行它时，它运行正常。

我甚至使用了重启机器。它能是什么？

每个请求的解释：

默认30秒后查询超时（在ADO.NET中）。如果我将其设置为0（无限期） - 它会无限期地运行。在查询分析器中，它立即运行（1秒）
查询未更改。以下是查看代码：

public static List<Shipment> GetShipments(List<string> customerIds, DateTime dateFrom, DateTime dateTo)
{
    try
    {
        var data = new List<Shipment>();
        using (var connection = new SqlConnection(ConnectionString))
        {
            connection.Open();

            const string SQL = @"
                    SELECT TOP 1000 SH.ShipmentId, SH.TripId, CASE IsCancelled WHEN 1 THEN 'X' ELSE SH.Status END Status, 
                        SH.FromMunicipality, SH.FromAdministrativeArea, 
                        SH.ToMunicipality, SH.ToAdministrativeArea, 
                        SH.PONumber, SH.ProCodeId, SH.ShipperReferenceNumber, SH.BOLNumber,
                        T.ScheduledPickupDate, T.ScheduledDeliveryDate,
                        CASE WHEN NOT TN.PDFBinary IS NULL THEN 1 ELSE 0 END HasPOD
                    FROM dbo.vPcyShipment SH 
                    INNER JOIN dbo.vPcyTrip T ON SH.TripId = T.TripId
                    LEFT OUTER JOIN dbo.tTripNumber TN ON SH.TripId = TN.TripNumber
                    WHERE SH.CustomerId IN ({0})
                        AND T.ScheduledPickupDate BETWEEN @DateFrom AND @DateTo
                    ORDER BY T.ScheduledPickupDate DESC";

            var customerParamNames = customerIds.Select((s, i) => "@customer" + i.ToString(CultureInfo.InvariantCulture)).ToArray();
            var customerInClause = string.Join(",", customerParamNames);

            using (var command = new SqlCommand(string.Format(SQL, customerInClause), connection))
            {
                command.Parameters.AddWithValue("@DateFrom", dateFrom);
                command.Parameters.AddWithValue("@DateTo", dateTo);
                for (var i = 0; i < customerParamNames.Length; i++)
                {
                    command.Parameters.AddWithValue(customerParamNames[i], customerIds[i]);
                }

                using (var dataTable = new DataTable())
                {
                    dataTable.Load(command.ExecuteReader());
                    var query = from row in dataTable.AsEnumerable()
                                select new Shipment
                                {
                                    ShipmentId = row.Field<string>("ShipmentId"),
                                    TripId = row.Field<string>("TripId"),
                                    PoNo = row.Field<string>("PONumber"),
                                    ProCodeId = row.Field<string>("ProCodeId"),
                                    ShipperRef = row.Field<string>("ShipperReferenceNumber"),
                                    BolNo = row.Field<string>("BOLNumber"),
                                    ProphecyStatusCode = row.Field<string>("Status"),
                                    FromCity = row.Field<string>("FromMunicipality"),
                                    FromState = row.Field<string>"FromAdministrativeArea"),
                                    ToCity = row.Field<string>("ToMunicipality"),
                                    ToState = row.Field<string>("ToAdministrativeArea"),
                                    ScheduledPickup = row.Field<DateTime>("ScheduledPickupDate"),
                                    ScheduledDelivery = row.Field<DateTime>("ScheduledDeliveryDate"),
                                    HasPOD = row.Field<int>("HasPOD")
                        };

                    data.AddRange(query.ToList());
                }
            }
        }
        return data;
    }
    catch (Exception ex)
    {
        Log(ex);
    }

    return null;
}

Answer 1

没有足够的信息可以继续，但我首先要将您的所有来电更改为.AddWithValue()，而不是使用.Add()。当您致电.AddWithValue()时，.Net必须猜测您的参数类型。如果它猜错了（它可以），突然你的查询可能不再与索引匹配，这说明了数据库性能的核心。

Answer 2

查询分析器和ADO.NET之间的性能差异通常与数据库连接的不同配置有关（例如ANSI_NULLS）。

如果您确定使用完全相同的查询（相同的客户ID，相同的日期范围），您可以尝试使用ANSI_NULLS和查询分析器中的其他设置来尝试重现您在ADO中看到的行为.NET。

从ADO.NET运行时查询超时但在Query Analyer中运行正常

2 个答案: