我在代码中间歇性地收到此错误.有时它会在一段时间后发生.有时它发生在10次中.我不会在我的SQL中做任何独特或特殊的事情,而不像StackOverflow上正在执行COPY命令的其他海报.我所做的只是选择.
这是堆栈跟踪:
Exception while reading from stream
at Npgsql.ReadBuffer.Ensure(Int32 count, Boolean dontBreakOnTimeouts)
at Npgsql.NpgsqlConnector.DoReadMessage(DataRowLoadingMode dataRowLoadingMode, Boolean isPrependedMessage)
at Npgsql.NpgsqlConnector.ReadMessageWithPrepended(DataRowLoadingMode dataRow LoadingMode)
at Npgsql.NpgsqlConnector.ReadMessage(DataRowLoadingMode dataRowLoadingMode)
at Npgsql.NpgsqlConnector.ReadExpecting[T]()
at Npgsql.NpgsqlDataReader.NextResultInternal()
at Npgsql.NpgsqlDataReader.NextResult()
at Npgsql.NpgsqlCommand.Execute(CommandBehavior behavior)
at Npgsql.NpgsqlCommand.ExecuteDbDataReaderInternal(CommandBehavior behavior)
at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader()
at Npgsql.NpgsqlCommand.ExecuteReader()
at JBetaFinder.Program.portfolioSimulation(String beginResult, String endResult) in c:\Users\j\Documents\Visual Studio 2013\Projects\JBetaFinder\JBetaFinder\Program.cs:line 571
有关如何避免此错误的任何建议？这是Npgsql和postgres的问题吗？
这是我的SQL语句,似乎是最成问题的:
select leg1.trade_date, sum(p.qty) as totalqty, max(gas.net_change)*10000 as avggaschange,
sum(((leg1.settlement_price - leg2.settlement_price) - (leg3.settlement_price - leg4.settlement_price))*qty*1000000) as spread_value_weight
from quant_portfolio p
inner join (select distinct trade_date, …