Question

我必须使用linq构建一个大型查找查询。由于我使用聚合查询的原因很繁琐，由于（可能）缺少索引，查询速度很慢，问题是如何为约20个字段创建复合索引，这样行得通吗？

这是我的linq查询：

var listFlight = CacheFlightsPair.AsQueryable(new AggregateOptions() { AllowDiskUse = true })
            .Where(x => x.CreateDate > minDateForResults && ((!string.IsNullOrEmpty(slotRule.ExternalId) && x.Source.ExternalId == slotRule.ExternalId)
                        || ((x.Source.OutDepartureDate.Value >= slotRule.FromDate && x.Source.OutDepartureDate.Value < slotRule.FromDate.AddDays(1))
                        && (x.Source.InArrivalDate.HasValue && x.Source.InArrivalDate.Value >= slotRule.ToDate && x.Source.InArrivalDate.Value < slotRule.ToDate.AddDays(1))
                        && (slotRule.SupplierId == 0 || (x.Source.Supplier != null && x.Source.Supplier.ID == slotRule.SupplierId))
                        && (slotRule.CityId == 0 || x.Source.OutArrivalAirportID.City.ID == slotRule.CityId)
                        && (slotRule.PriceFrom == 0) || ((x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.EUR && x.Source.Price >= minPriceCurrencies[(int)CommonUtil.Cu_Currencies.EUR]) ||
                                                            (x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.USD && x.Source.Price >= minPriceCurrencies[(int)CommonUtil.Cu_Currencies.USD]) ||
                                                            (x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.ILS && x.Source.Price >= minPriceCurrencies[(int)CommonUtil.Cu_Currencies.ILS])
                                                            )
                        && (slotRule.PriceTo == 0) || ((x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.EUR && x.Source.Price <= maxPriceCurrencies[(int)CommonUtil.Cu_Currencies.EUR]) ||
                                                            (x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.USD && x.Source.Price <= maxPriceCurrencies[(int)CommonUtil.Cu_Currencies.USD]) ||
                                                            (x.Source.CurrencyID.ID == (int)CommonUtil.Cu_Currencies.ILS && x.Source.Price <= maxPriceCurrencies[(int)CommonUtil.Cu_Currencies.ILS])
                                                        )
                        && (slotRule.FlightTypeId == 0 || (x.Source.FlightType != null && x.Source.FlightType.ID == slotRule.FlightTypeId))
                        && (slotRule.NumberOfAdults == 0 || x.Source.NumberOfAdults == slotRule.NumberOfAdults)
                        && x.Source.NumberOfChildren == slotRule.NumberOfChildren
                        && x.Source.NumberOfBabies == slotRule.NumberOfBabies
                        && x.Source.NumberOfPensioners == slotRule.NumberOfPensioners
                        && x.Source.NumberOfPensioners == slotRule.NumberOfStudents
                        )));

如果我应该使用其他方法，请告诉我。

MongoDB LINQ和聚集在许多领域

0 个答案: