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How do I diagnose the Timeout of a SQL command called from my C# web service app

Posted on 2014-03-25
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Last Modified: 2014-04-11
I am calling a stored proc in a MS SQL server database that, when run in SSMS, takes 12 seconds.  The SqlCommand object I am using to call the stored proc times out when I call from my C# webservice.  I have up'd the CommandTimeout to 120 seconds but get the same result....

SqlCommand cmd = new SqlCommand(procName, conn) {CommandType = CommandType.StoredProcedure, CommandTimeout = 120};
SqlDataAdapter sda = new SqlDataAdapter(cmd);

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How do I go about determining the bottleneck?  

Again, this proc will execute to completion in SSMS in 12 seconds.

Thanks,
Bruce
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Question by:Bruce
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by:Craig Wagner
Craig Wagner earned 125 total points
ID: 39954160
First thing I would do is fire up SQL Server Profiler and make sure that what you think your code is sending to the database is actually what your code is sending to the database.
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lcohan earned 375 total points
ID: 39954165
"Again, this proc will execute to completion in SSMS in 12 seconds."
How much data it returns? could this be the issue?


"How do I go about determining the bottleneck?  "
I suggest you use SQL Profiler to trace any call to that SQL Sproc.

http://msdn.microsoft.com/en-us/library/ff650699.aspx
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by:Bruce
ID: 39954192
It returns just two rows of 12 columns of data.  Small about really...
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by:Bruce
ID: 39954195
Why wouldn't a 2 minute command timeout eventually consume a 12 second SQL query?
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by:lcohan
lcohan earned 375 total points
ID: 39954215
"Why wouldn't a 2 minute command timeout eventually consume a 12 second SQL query? "

How can you be 100% sure that the "timeout" IS the actual error and not something else and...Are you sure is running against that exact Server database and doing what is supposed to?


Here - start your UI code and run a sp_who2 in a SQL SSMS query OR check SQL Activity Monitor in SSMS to see that indeed you are running that SP against that SQL Database.

just type the command below in a SQL SSMS query and check its results:

sp_who2;
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ID: 39954241
Do you have more code after what you showed us.

The SqlDataAdapter alone does not execute the command. You need to Fill a DataTable for it to execute the command:

DataTable tbl = New DataTable();
sda.Fill(tbl);
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by:Bruce
ID: 39956152
SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            conn.Close();
            return ds;

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Per the mention above from lcohon I have have opened SSMS and did an sp_who2 while the Fill command was called...  I watch the Login that my app uses (unique in this environment) and the CPUTime just keeps counting up to the 240 sec timeout limit I set in the code.

I have tried to implement a SQLDataReader, thinking the Forward Only nature of that reader might reduce the overhead in returning the data.  There should be less than 1KB returned (See attached Clients Stats screenshot)  The Reader also times out.

Thoughts?
Timeout-Exception-CommDetail.PNG
Client-Stats-CommDetail.PNG
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by:Bruce
ID: 39995009
Update: We had a similar issue with another SP being called from our web service app.  The sp would run from within SSMS in a short time, but when called from the service it would hang. (Verified in SQL Analyzer, processes would contiuously run (Task State RUNNING) in "SELECT INTO" command) We found that the web service was passing in an empty string as one of the parameters and it was not being handled well in the sp and that was causing the sp to timeout.
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