Code Keeps Timing Out

问题

So, we've got this set of code that, for some reason, keeps timing out. It's not the stored procedure that it's running, because that runs fine. Also, if we remove the parameter from the c# code, the code runs. The parameter keeps breaking (causing it to time out) and we can't figure out why.

c#:

public static PTWViewList GetList(int studynumber) 
        {
            PTWViewList tempList = new PTWViewList();
            using (SqlConnection myConnection = new SqlConnection(AppConfiguration.cnARDB))
            {
                string spName = "ardb.PTWViewSelect";
                SqlCommand myCommand = new SqlCommand(spName, myConnection);
                myCommand.CommandType = CommandType.StoredProcedure;
                myCommand.Parameters.AddWithValue("@study", studynumber); 

                myConnection.Open();
                using (NullableDataReader myReader = new NullableDataReader(myCommand.ExecuteReader())) /*this is where the code times out*/
                {
                    tempList = new PTWViewList();
                    while (myReader.Read())
                    {
                        tempList.Add(FillDataRecord(myReader));
                    }
                    myReader.Close();
                }
            }

            tempList.ListCount = tempList.Count;
            return tempList;
        }

stored procedure:

CREATE PROCEDURE [ardb].[PTWViewSelect] 
    @studynumber int = NULL,
    @quoteid uniqueidentifier = NULL,
    @lineitemid uniqueidentifier = NULL
AS
BEGIN
    SET NOCOUNT ON;

    SELECT
        [Study]
        ,[LineItemID]
        ,[QuoteID]
        ,[Total]
        ,[COOP]
        ,[VendorCost]
        ,[CustCost]
        ,[LineItemNumber]
        ,[StudyTypeCode]
        ,[GroupLeader]
        ,[PTWDate]
        ,[PONumber]
        ,[POStatus]
        ,[StudyDirector]
        ,[SL_DESC_L]
        ,[SL_Code]
        ,ProjectDescription
        ,CreatedBy
        ,chARProcess
        ,CODate
    FROM
        [ARDB].[dbo].[PTWView]
    WHERE
        (@studynumber is null or StudyNumber=@studynumber)
        AND (@quoteid is null or QuoteID=@quoteid)
        AND (@lineitemid is null or LineItemID = @lineitemid)
END

回答1:

have you tried

myCommand.Parameters.AddWithValue("@studynumber", studynumber);

instead of:

myCommand.Parameters.AddWithValue("@study", studynumber); 

回答2:

EDIT If passing parameters is the problem, then it comes down to how much time the stored procedure takes to execute. Default timeout for SQL server is usually 120 secs. You can add "Connect Timeout" to increase timeout in your DB connection string and check out.

** Old Answer -- Ignore ** Without stack trace, and taking your word that the stored procedure is fine, I am guessing that it is timing out due to the connection failure. The code is unable to connect to your DB server and hence timing out.

回答3:

setting arithabort off made the sp take 45 seconds as opposed to 1. setting it back on changed it back to 1. I updated the stored procedure to set it on, no change in the app. Changed it to off, no change. I then removed the update and then the app worked fine.

I believe what happened is that updating the stored procedure caused it to recompile, fixing the issue. I'm not 100% sure on this though.

回答4:

One thing could be the ARITHABORT setting, set it to ON...NET defaults to OFF

run the proc in SSMS with ARITHABORT set to OFF and see if it runs slower now like from .NET

example

MyConnection.Execute "SET ARITHABORT ON"

Another thing is that your WHERE clause is not optimal, take a look at Do you use Column=@Param OR @Param IS NULL in your WHERE clause? Don't, it doesn't perform

does the proc run slow with parameters in SSMS? Can you show the execution plan?

来源：https://stackoverflow.com/questions/4539765/code-keeps-timing-out