Query Waits On SOS_SCHEDULER_YIELD For Ever

Jun 21, 2007

HI,

I have a query that keeps on waiting with a wait type of SOS_SCHEDULER_YIELD. I have checked for the CPU pressure as well, and there is nothing else running. The query outline is given below.

Select a,b,c,d....

FROM tableA A inner join tableB B on A.a = B.b

inner join tableC on B.c = C.c

where

a.x not in (SELECT x from tableX where y = '???')



I have restored the copy of prod DB on a DEV box and ran the query which runs fine. But the prod box which is more powerful chokes. DEV is a 4CPU/4GB box and PROD is 8CPU/32GB box. All other DB and Server settings are exactly the same. DEV is SQL 2005 Standard ed SP2. Prod is a SQL 2005 Enterprise ed SP2.



Thanks in advance,

Sirish

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Back in the days of SQL 7.0 I used a lot of ODBC SELECT querying form VB applications, in which I implemented NOLOCK in order to prevent the primary business applications from being locked out of tables once the queries were run.

Now, quite a few years later, I'm busying myself converting a lot of old Access based forms and queries to TSQL on SQL-Server 2000, and wonder aimlessly why NOLOCK queries (simple select ones) are imensely slower than a standars select clause.


SELECT * FROM employees


This would be much much faster than the code below, but users would get "The current record could not be accessed, as it is being used by another user", evidently because I'm locking the record while producing the output.


SELECT * FROM employees (nolock)


So this could should - as I remember it - do a dirty read on table, not obstructing other users and give me a snapshot of date as they are, although they might be locked for edit.

Could anyone explain to me why the nOLOCK query fials to give me any output? It is as if the nolock request is waiting for the table/records to free? In which case I'll never be able to run a query.

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Aug 29, 2006

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Jun 7, 2007



what is SOS_SCHEDULER_YIELD?



and when dose SOS_SCHEDULER_YIELD work?



if having more CPU, will SOS_SCHEDULER_YIELD be influenced by?





thanks for reading

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DECLARE @NoteID INT,-- NULL OUTPUT,
@Note_Description NVARCHAR(3000),-- = NULL,
@Date DateTime,-- = NULL OUTPUT,
@ByWho NVARCHAR(30),-- = NULL,
@FK_Action_Performed NVARCHAR(40),-- = NULL,
@FK_UserID INT,-- = NULL,
@FK_JobID INT,-- = NULL,
@Job_Date DateTime,-- = NULL,
@Start DateTime,-- = NULL,
@Finish DateTime,-- = NULL,

@BeenRead NVARCHAR(10),-- = NULL

@FK_UserIDList NVARCHAR(4000)-- = NULL


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--SET @Date DateTime = NULL OUTPUT,
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--AS

--SET NOCOUNT ON


SET NOCOUNT ON

SET XACT_ABORT ON

BEGIN TRANSACTION

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-- Insert Values into the customer table
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Date,
ByWho,
FK_Action_Performed,
FK_UserID,
FK_JobID,
Job_Date,
Start,
Finish)

SELECT --@NoteID,
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@Date,
@ByWho,
@FK_Action_Performed,
@FK_UserID,
@FK_JobID,

@Job_Date,
@Start,
@Finish

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SELECT @NoteID = @@IDENTITY


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--@NoteID,
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-- @Fax,
-- @PKId,
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COMMIT TRANSACTION

--------------------------------------------------
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<asp:Parameter Name="VAL3" />
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<br />
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<br />
<br />
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(Visual Web Devleoper 2005 Express and SQL Server Management Studio Express)
 

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
From an ADO.NET 2.0 book, I copied the code of ConnectionPoolingForm to my VB 2005 Express. The following is part of the code:

Imports System.Collections.Generic

Imports System.ComponentModel

Imports System.Drawing

Imports System.Text

Imports System.Windows.Forms

Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.Common

Imports System.Diagnostics

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End Using

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End Sub

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btnQuery.Enabled = False

btnClose.Enabled = False

btnRemove.Enabled = False

btnClearPool.Enabled = False

btnClearAllPools.Enabled = False

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Try

bldr.ConnectionString = strConn

Catch ex As Exception

MessageBox.Show(ex.Message, "Invalid connection string for " + bldr.GetType().Name, MessageBoxButtons.OK, MessageBoxIcon.Error)

Return

End Try

Dim dlg As New ConnectionStringBuilderDialog()

If dlg.EditConnectionString(_ProviderFactory, bldr) = System.Windows.Forms.DialogResult.OK Then

txtConnectionString.Text = dlg.ConnectionString

SetStatus("Ready")

Else

SetStatus("Operation cancelled")

End If

End Sub

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Dim blnError As Boolean = False

Dim strErrorMessage As String = ""

Dim strErrorCaption As String = "Connection attempt failed"

StartWaitUI()

Try

Dim cn As DbConnection = _ProviderFactory.CreateConnection()

cn.ConnectionString = txtConnectionString.Text

cn.Open()

lstConnections.SelectedIndex = lstConnections.Items.Add(cn)

Catch ex As Exception

blnError = True

strErrorMessage = ex.Message

End Try

EndWaitUI()

If blnError Then

SetStatus(strErrorCaption)

MessageBox.Show(strErrorMessage, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

Else

SetStatus("Connection opened succesfully")

End If

End Sub

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StartWaitUI()

Try

_SelectedConnection.Open()

EnableOrDisableButtons(_SelectedConnection)

SetStatus("Connection opened succesfully")

EndWaitUI()

Catch ex As Exception

EndWaitUI()

Dim strErrorCaption As String = "Connection attempt failed"

SetStatus(strErrorCaption)

MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try

End Sub

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Me.Cursor = Cursors.WaitCursor

DisableAllButtons()

Try

Dim cmd As DbCommand = _SelectedConnection.CreateCommand()

cmd.CommandText = queryDialog.txtQuery.Text

Using rdr As DbDataReader = cmd.ExecuteReader()

If rdr.HasRows Then

Dim resultsForm As New QueryResultsForm()

resultsForm.ShowResults(cmd.CommandText, rdr)

SetStatus(String.Format("Query returned {0} row(s)", resultsForm.RowsReturned))

Else

SetStatus(String.Format("Query affected {0} row(s)", rdr.RecordsAffected))

End If

Me.Cursor = Cursors.Default

EnableOrDisableButtons(_SelectedConnection)

End Using

Catch ex As Exception

Me.Cursor = Cursors.Default

EnableOrDisableButtons(_SelectedConnection)

Dim strErrorCaption As String = "Query attempt failed"

SetStatus(strErrorCaption)

MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try

Else

SetStatus("Operation cancelled")

End If

End Sub
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
I executed the code successfully and I got a box which asked for "Enter the query string".
I typed in the following: EXEC dbo.SalesByCategory @Seafood. I got the following box: Query attempt failed. Must declare the scalar variable "@Seafood". I am learning how to enter the string for the "SQL query programed in the subQuery_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnQuery.Click" (see the code statements listed above). Please help and tell me what I missed and what I should put into the query string to get the information of the "Seafood" category out.

Thanks in advance,
Scott Chang

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