我这里有点奇怪。我在运行批处理的控制台应用程序中使用 Entity Framework Code First。代码每次循环执行存储过程的一系列日期。
目前它循环了大约 300 次，随着时间的推移，每次执行都会变得越来越慢，直到它爬行时接近尾声。
我试过内存分析，但不是这样。这是示例代码。
_dbContext = new FooContext();
_barService = new BarService(new GenericRepository<Bar>(), _dbContext);
for (var date = lastCalculatedDate.AddDays(1); date <= yesterday; date = date.AddDays(1))
{
_barService.CalculateWeightings(date);
}
所有 CalculateWeightings 所做的是（我也在使用 nlog）
public void CalculateWeightings(DateTime dateTime)
{
_logger.Info("Calculating weightings for {1}", dateTime);
Context.Database.ExecuteSqlCommand("EXEC CalculateWeightings @dateTime", new SqlParameter("@dateTime", dateTime);
}
存储过程只是用一些记录填充一个表。没什么复杂的，表格最终有几行 1000 行，所以问题不存在
有什么想法吗？
对于那些想要查看 sql 的人。它有点庞然大物，但我看不出有任何原因会随着时间的推移而减慢。处理的行数非常少。
CREATE PROCEDURE [dbo].[CalculateWeightings]
@StartDate DateTime,
@EndDate DateTime,
@TradedMonthStart DateTime,
@InstrumentGroupId int
AS
BEGIN
---- GET ALL THE END OF DAY PRICINGS FOR MONTHLYS ----
SELECT
ROW_NUMBER() OVER
(
PARTITION BY RawTrades.FirstSequenceItemName,
CONVERT(VARCHAR, RawTrades.LastUpdate, 103)
ORDER BY RawTrades.FirstSequenceItemName, RawTrades.LastUpdate DESC
) AS [Row],
RawTrades.FirstSequenceItemID AS MonthId,
Sequences.ActualStartMonth,
Sequences.ActualEndMonth,
RawTrades.FirstSequenceItemName AS [MonthName],
CONVERT(VARCHAR, RawTrades.LastUpdate, 103) AS LastUpdate,
RawTrades.Price
INTO #monthly
FROM RawTrades
INNER JOIN Sequences ON RawTrades.FirstSequenceItemId = Sequences.SequenceItemId AND RawTrades.FirstSequenceId = Sequences.SequenceId
WHERE RawTrades.FirstSequenceID IN (SELECT MonthlySequenceId FROM Instruments WHERE InstrumentGroupId = @InstrumentGroupId)
AND [Action] <> 'Remove'
AND LastUpdate >= @StartDate
AND LastUpdate < @EndDate
AND ActualStartMonth >= @TradedMonthStart
ORDER BY RawTrades.FirstSequenceItemID, RawTrades.LastUpdate DESC
---- GET ALL THE END OF DAY PRICINGS FOR QUARTERLYS ----
SELECT
ROW_NUMBER() OVER
(
PARTITION BY RawTrades.FirstSequenceItemName,
CONVERT(VARCHAR, RawTrades.LastUpdate, 103)
ORDER BY RawTrades.FirstSequenceItemName, RawTrades.LastUpdate DESC
) AS [Row],
CONVERT(VARCHAR, RawTrades.LastUpdate, 103) AS LastUpdate,
Sequences.ActualStartMonth,
Sequences.ActualEndMonth,
RawTrades.Price
INTO #quarterly
FROM RawTrades
INNER JOIN Sequences ON RawTrades.FirstSequenceItemId = Sequences.SequenceItemId AND RawTrades.FirstSequenceId = Sequences.SequenceId
WHERE RawTrades.FirstSequenceID IN (SELECT QuarterlySequenceId FROM Instruments WHERE InstrumentGroupId = @InstrumentGroupId)
AND Action <> 'Remove'
AND LastUpdate >= @StartDate
AND LastUpdate < @EndDate
AND RawTrades.Price > 20
ORDER BY RawTrades.FirstSequenceItemID, RawTrades.LastUpdate DESC
---- GET ALL THE END OF DAY PRICINGS FOR QUARTERLYS ----
SELECT
ROW_NUMBER() OVER
(
PARTITION BY RawTrades.FirstSequenceItemName,
CONVERT(VARCHAR, RawTrades.LastUpdate, 103)
ORDER BY RawTrades.FirstSequenceItemName, RawTrades.LastUpdate DESC
) AS [Row],
CONVERT(VARCHAR, RawTrades.LastUpdate, 103) AS LastUpdate,
Sequences.ActualStartMonth,
Sequences.ActualEndMonth,
RawTrades.Price
INTO #seasonal
FROM RawTrades
INNER JOIN Sequences ON RawTrades.FirstSequenceItemId = Sequences.SequenceItemId AND RawTrades.FirstSequenceId = Sequences.SequenceId
WHERE RawTrades.FirstSequenceID IN (SELECT SeasonalSequenceId FROM Instruments WHERE InstrumentGroupId = @InstrumentGroupId)
AND Action <> 'Remove'
AND LastUpdate >= @StartDate
AND LastUpdate < @EndDate
AND RawTrades.Price > 20
ORDER BY RawTrades.FirstSequenceItemID, RawTrades.LastUpdate DESC
---- BEFORE WE INSERT RECORDS MAKE SURE WE DON'T ADD DUPLICATES ----
DELETE FROM LiveCurveWeightings
WHERE InstrumentGroupId = @InstrumentGroupId
AND CalculationDate = @EndDate
---- CALCULATE AND INSERT THE WEIGHTINGS ----
INSERT INTO LiveCurveWeightings (InstrumentGroupId, CalculationDate, TradedMonth, QuarterlyWeighting, SeasonalWeighting)
SELECT
@InstrumentGroupId,
@EndDate,
#monthly.ActualStartMonth,
AVG(COALESCE(#monthly.Price / #quarterly.Price,1)) AS QuarterlyWeighting,
AVG(COALESCE(#monthly.Price / #seasonal.Price,1)) AS SeasonalWeighting
FROM #monthly
LEFT JOIN #quarterly
ON #monthly.ActualStartMonth >= #quarterly.ActualStartMonth
AND #monthly.ActualEndMonth <= #quarterly.ActualEndMonth
AND #quarterly.[Row] = 1
AND #monthly.LastUpdate = #quarterly.LastUpdate
LEFT JOIN #seasonal
ON #monthly.ActualStartMonth >= #seasonal.ActualStartMonth
AND #monthly.ActualEndMonth <= #seasonal.ActualEndMonth
AND #seasonal.[Row] = 1
AND #monthly.LastUpdate = #seasonal.LastUpdate
WHERE #monthly.[Row] = 1
GROUP BY #monthly.ActualStartMonth
DROP TABLE #monthly
DROP TABLE #quarterly
DROP TABLE #seasonal
END
