我最近继承了一些偶尔会出现超时问题的代码。我对ORM很熟悉，所以我无法确定此代码中是否有任何错误。当它没有超时时，它会在几秒钟内完成。超时大约需要一分钟。
以下是代码：
Dim sql As String = "UPDATE VendorInfo SET " & _
"AbsInkUpdateStatus=@AbsInkUpdateStatus, AccountingNotes=@AccountingNotes, " & _
"AccountNumber=@AccountNumber, Address_Ship=@Address_Ship, " & _
"Address0=@Address0, Address1=@Address1, Address2=@Address2, ArtEmail=@ArtEmail, " & _
"ArtRequirements=@ArtRequirements, City=@City, " & _
"City_Ship=@City_Ship, CreditLimit=@CreditLimit, DisplayName=@DisplayName, " & _
"EarlyBy=@EarlyBy, EarlyConfirm=@EarlyConfirm, " & _
"EarlyHas=@EarlyHas, EarlyNet=@EarlyNet, " & _
"EarlyNotes=@EarlyNotes, EarlyOn=@EarlyOn, " & _
"EarlyPercent=@EarlyPercent, Email=@Email, " & _
"Fax=@Fax, PContactName=@PContactName, " & _
"Phone=@Phone, Pricing=@Pricing, " & _
"PromosBy=@PromosBy, PromosConfirm=@PromosConfirm, " & _
"PromosHas=@PromosHas, PromosNotes=@PromosNotes, " & _
"PromosOn=@PromosOn, QBName=@QBName, QBTerms=@QBTerms, RebateBy=@RebateBy, " & _
"RebateConfirm=@RebateConfirm, RebateHas=@RebateHas, " & _
"RebateNotes=@RebateNotes, RebateOn=@RebateOn, " & _
"RushPolicy=@RushPolicy, SampleBy=@SampleBy, " & _
"SampleConfirm=@SampleConfirm, SampleHas=@SampleHas, " & _
"SampleNotes=@SampleNotes, SampleOn=@SampleOn, " & _
"SamplePolicy=@SamplePolicy, ShippingBy=@ShippingBy, " & _
"ShippingConfirm=@ShippingConfirm, ShippingHas=@ShippingHas, " & _
"ShippingNotes=@ShippingNotes, ShippingOn=@ShippingOn, " & _
"ShipTo=@ShipTo, [SMP FAX]=@SMP_FAX, " & _
"SpecialBy=@SpecialBy, SpecialConfirm=@SpecialConfirm, " & _
"SpecialHas=@SpecialHas, SpecialInstructions=@SpecialInstructions, " & _
"SpecialNotes=@SpecialNotes, SpecialOn=@SpecialOn, " & _
"SpecialPricingShort=@SpecialPricingShort, State=@State, " & _
"State_Ship=@State_Ship, TermsBy=@TermsBy, " & _
"TermsConfirm=@TermsConfirm, TermsHas=@TermsHas, " & _
"TermsNotes=@TermsNotes, TermsOn=@TermsOn, " & _
"TypicalShippingCost=@TypicalShippingCost, UpdateStatus=@UpdateStatus, " & _
"VendorName=@VendorName, VendorStrength=@VendorStrength, " & _
"WebPage=@WebPage, ZipCode=@ZipCode, EmailPO=@EmailPO, SendPO=@SendPO, " & _
"ZipCode_Ship=@ZipCode_Ship WHERE ID=@ID"
Dim p() As SqlParameter = New SqlParameter(74) {}
p(0) = MakeSQLParam("@AbsInkUpdateStatus", SqlDbType.VarChar, 50, SS(ht("AbsInkUpdateStatus")))
p(1) = MakeSQLParam("@AccountingNotes", SqlDbType.VarChar, 500, SS(ht("AccountingNotes")))
p(2) = MakeSQLParam("@AccountNumber", SqlDbType.NVarChar, 35, SS(ht("AccountNumber")))
p(3) = MakeSQLParam("@Address_Ship", SqlDbType.NVarChar, 50, SS(ht("Address_Ship")))
p(68) = MakeSQLParam("@Address0", SqlDbType.VarChar, 100, SS(ht("Address0")))
p(4) = MakeSQLParam("@Address1", SqlDbType.NVarChar, 50, SS(ht("Address1")))
p(69) = MakeSQLParam("@Address2", SqlDbType.VarChar, 50, SS(ht("Address2")))
p(5) = MakeSQLParam("@ArtEmail", SqlDbType.NVarChar, 100, SS(ht("ArtEmail")))
p(6) = MakeSQLParam("@ArtRequirements", SqlDbType.NText, SS(ht("ArtRequirements")))
p(7) = MakeSQLParam("@City", SqlDbType.NVarChar, 50, SS(ht("City")))
p(8) = MakeSQLParam("@City_Ship", SqlDbType.NVarChar, 50, SS(ht("City_Ship")))
p(72) = MakeSQLParam("@CreditLimit", SqlDbType.Float, ht("CreditLimit"))
If ((Not ht.ContainsKey("EmailPO")) OrElse IsDBNull(ht("EmailPO")) OrElse String.IsNullOrEmpty(ht("EmailPO"))) Then
p(73) = MakeSQLParam("@EmailPO", SqlDbType.Bit, DBNull.Value)
Else
p(73) = MakeSQLParam("@EmailPO", SqlDbType.Bit, Convert.ToBoolean(ht("EmailPO")))
End If
If ((Not ht.ContainsKey("SendPO")) OrElse IsDBNull(ht("SendPO")) OrElse String.IsNullOrEmpty(ht("SendPO"))) Then
p(74) = MakeSQLParam("@SendPO", SqlDbType.NVarChar, 255, DBNull.Value)
Else
p(74) = MakeSQLParam("@SendPO", SqlDbType.NVarChar, 255, SS(ht("SendPO")))
End If
p(9) = MakeSQLParam("@DisplayName", SqlDbType.NVarChar, 255, SS(ht("DisplayName")))
p(10) = MakeSQLParam("@EarlyBy", SqlDbType.VarChar, 5, SS(ht("EarlyBy")))
p(11) = MakeSQLParam("@EarlyConfirm", SqlDbType.VarChar, 50, SS(ht("EarlyConfirm")))
p(12) = MakeSQLParam("@EarlyHas", SqlDbType.VarChar, 10, SS(ht("EarlyHas")))
p(13) = MakeSQLParam("@EarlyNet", SqlDbType.VarChar, 10, SS(ht("EarlyNet")))
p(14) = MakeSQLParam("@EarlyNotes", SqlDbType.VarChar, 125, SS(ht("EarlyNotes")))
p(15) = MakeSQLParam("@EarlyOn", SqlDbType.DateTime, DtoDB(ht("EarlyOn")))
p(16) = MakeSQLParam("@EarlyPercent", SqlDbType.Decimal, DBS(ht("EarlyPercent"), True))
p(17) = MakeSQLParam("@Email", SqlDbType.NVarChar, 75, SS(ht("Email")))
p(18) = MakeSQLParam("@Fax", SqlDbType.NVarChar, 50, SS(ht("Fax")))
p(19) = MakeSQLParam("@ID", SqlDbType.Int, ht("ID"))
p(20) = MakeSQLParam("@PContactName", SqlDbType.NVarChar, 50, SS(ht("PContactName")))
p(21) = MakeSQLParam("@Phone", SqlDbType.NVarChar, 50, SS(ht("Phone")))
p(22) = MakeSQLParam("@Pricing", SqlDbType.NVarChar, 255, SS(ht("Pricing")))
p(23) = MakeSQLParam("@PromosBy", SqlDbType.VarChar, 5, SS(ht("PromosBy")))
p(24) = MakeSQLParam("@PromosConfirm", SqlDbType.VarChar, 50, SS(ht("PromosConfirm")))
p(25) = MakeSQLParam("@PromosHas", SqlDbType.VarChar, 10, SS(ht("PromosHas")))
p(26) = MakeSQLParam("@PromosNotes", SqlDbType.VarChar, 125, SS(ht("PromosNotes")))
p(27) = MakeSQLParam("@PromosOn", SqlDbType.DateTime, DtoDB(ht("PromosOn")))
p(70) = MakeSQLParam("@QBName", SqlDbType.VarChar, 41, SS(ht("QBName")))
p(71) = MakeSQLParam("@QBTerms", SqlDbType.VarChar, 31, SS(ht("QBTerms")))
p(28) = MakeSQLParam("@RebateBy", SqlDbType.VarChar, 5, SS(ht("RebateBy")))
p(29) = MakeSQLParam("@RebateConfirm", SqlDbType.VarChar, 50, SS(ht("RebateConfirm")))
p(30) = MakeSQLParam("@RebateHas", SqlDbType.VarChar, 10, SS(ht("RebateHas")))
p(31) = MakeSQLParam("@RebateNotes", SqlDbType.VarChar, 125, SS(ht("RebateNotes")))
p(32) = MakeSQLParam("@RebateOn", SqlDbType.DateTime, DtoDB(ht("RebateOn")))
p(33) = MakeSQLParam("@RushPolicy", SqlDbType.NVarChar, 200, SS(ht("RushPolicy")))
p(34) = MakeSQLParam("@SampleBy", SqlDbType.VarChar, 5, SS(ht("SampleBy")))
p(35) = MakeSQLParam("@SampleConfirm", SqlDbType.VarChar, 50, SS(ht("SampleConfirm")))
p(36) = MakeSQLParam("@SampleHas", SqlDbType.VarChar, 10, SS(ht("SampleHas")))
p(37) = MakeSQLParam("@SampleNotes", SqlDbType.VarChar, 125, SS(ht("SampleNotes")))
p(38) = MakeSQLParam("@SampleOn", SqlDbType.DateTime, DtoDB(ht("SampleOn")))
p(39) = MakeSQLParam("@SamplePolicy", SqlDbType.NVarChar, 255, SS(ht("SamplePolicy")))
p(40) = MakeSQLParam("@ShippingBy", SqlDbType.VarChar, 5, SS(ht("ShippingBy")))
p(41) = MakeSQLParam("@ShippingConfirm", SqlDbType.VarChar, 50, SS(ht("ShippingConfirm")))
p(42) = MakeSQLParam("@ShippingHas", SqlDbType.VarChar, 10, SS(ht("ShippingHas")))
p(43) = MakeSQLParam("@ShippingNotes", SqlDbType.VarChar, 125, SS(ht("ShippingNotes")))
p(44) = MakeSQLParam("@ShippingOn", SqlDbType.DateTime, DtoDB(ht("ShippingOn")))
p(45) = MakeSQLParam("@ShipTo", SqlDbType.NVarChar, 100, SS(ht("ShipTo")))
p(46) = MakeSQLParam("@SMP_FAX", SqlDbType.NVarChar, 50, SS(ht("SMP FAX")))
p(47) = MakeSQLParam("@SpecialBy", SqlDbType.VarChar, 5, SS(ht("SpecialBy")))
p(48) = MakeSQLParam("@SpecialConfirm", SqlDbType.VarChar, 50, SS(ht("SpecialConfirm")))
p(49) = MakeSQLParam("@SpecialHas", SqlDbType.VarChar, 10, SS(ht("SpecialHas")))
p(50) = MakeSQLParam("@SpecialInstructions", SqlDbType.Text, SS(ht("SpecialInstructions")))
p(51) = MakeSQLParam("@SpecialNotes", SqlDbType.VarChar, 255, SS(ht("SpecialNotes")))
p(52) = MakeSQLParam("@SpecialOn", SqlDbType.DateTime, DtoDB(ht("SpecialOn")))
p(53) = MakeSQLParam("@SpecialPricingShort", SqlDbType.VarChar, 80, SS(ht("SpecialPricingShort")))
p(54) = MakeSQLParam("@State", SqlDbType.NVarChar, 25, SS(ht("State")))
p(55) = MakeSQLParam("@State_Ship", SqlDbType.NVarChar, 25, SS(ht("State_Ship")))
p(56) = MakeSQLParam("@TermsBy", SqlDbType.VarChar, 5, SS(ht("TermsBy")))
p(57) = MakeSQLParam("@TermsConfirm", SqlDbType.VarChar, 50, SS(ht("TermsConfirm")))
p(58) = MakeSQLParam("@TermsHas", SqlDbType.VarChar, 10, SS(ht("TermsHas")))
p(59) = MakeSQLParam("@TermsNotes", SqlDbType.VarChar, 125, SS(ht("TermsNotes")))
p(60) = MakeSQLParam("@TermsOn", SqlDbType.DateTime, DtoDB(ht("TermsOn")))
p(61) = MakeSQLParam("@TypicalShippingCost", SqlDbType.NText, SS(ht("TypicalShippingCost")))
p(62) = MakeSQLParam("@UpdateStatus", SqlDbType.VarChar, 50, SS(ht("UpdateStatus")))
p(63) = MakeSQLParam("@VendorName", SqlDbType.NVarChar, 100, SS(ht("VendorName")))
p(64) = MakeSQLParam("@VendorStrength", SqlDbType.NVarChar, 100, SS(ht("VendorStrength")))
p(65) = MakeSQLParam("@WebPage", SqlDbType.NVarChar, 100, SS(ht("WebPage")))
p(66) = MakeSQLParam("@ZipCode", SqlDbType.NVarChar, 15, SS(ht("ZipCode")))
p(67) = MakeSQLParam("@ZipCode_Ship", SqlDbType.NVarChar, 15, SS(ht("ZipCode_Ship")))
Dim con As SqlConnection = Nothing
Try
con = New SqlConnection(ConfigurationManager.AppSettings("LeadsConnectionString"))
SqlHelper.ExecuteNonQuery(con, CommandType.Text, sql, p)
Catch ex As Exception
Throw New Exception(ex.Message & " UPDATE failed for 'VendorInfo' " & ht.TableAsString, ex)
Finally
If (Not con Is Nothing) Then con.Close()
End Try
SS是“安全字符串”函数，MakeSQLParam将方向设置为input，并确保不违反大小值。
所以我的问题是：有没有人看到这个代码可能导致缓慢的错误？或者有没有人知道我可能要检查的其他任何可能有助于解决这个问题的事情？
谢谢！
答案 0 :(得分：1)
可能是由于参数嗅探导致不适当的查询计划被缓存。
如果有这么多参数，您可能每次都必须重新编译查询。
首先尝试重建索引并确保统计信息是最新的：（注意在生产环境中......）
exec sp_msforeachtable "DBCC DBREINDEX('?')"
go
exec sp_msforeachtable "UPDATE STATISTICS ? WITH FULLSCAN, COLUMNS"
go
然后，检查查询计划，了解在SSMS中运行SQL的快速和慢速情况。如果没有吸烟枪，那么检查可能持有锁的其他过程。
[StackOverflow上已经回答了许多相关问题。]
答案 1 :(得分：0)
这是针对SQL Server运行的吗？当它超时时你可能遇到了僵局。您可能希望监视遇到超时时正在运行的事务，和/或尝试在Management Studio中手动运行语句，看看是否遇到死锁。
如果您正在运行任何可以访问相同表的代理作业，或者可能访问相同表的其他进程，则可能是您的问题。