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POlong running sql procedure hangs website
 

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  1. POlong running sql procedure hangs website
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    <p>I have an MVC 4 web application that calls the business layer which calls a data layer method <code>ExecuteSP</code> asynchronously. The data layer method ExecuteSP calls a long running stored procedure like this:</p> <pre><code>public class MainDataLayer { private Database database; //Enterprise library 5 private DbCommand dbc; private List&lt;SPParams&gt; spParams; public MainDataLayer() { _database = DatabaseFactory.CreateDatabase("strConn"); //set multiple sp params like the one below _spParams.Add(new SPParams() { ParamName = "@pID", ParamValue = ID }); } public DataSet ExecuteSP() { dbc = database.GetStoredProcCommand('long_running_sp'); dbc.CommandTimeout = 300; foreach (SPParams p in spParams) { dbc.Parameters.Add(new SqlParameter(p.ParamName, p.ParamValue)); } DataSet ds = _database.ExecuteDataSet(dbc); return ds; } } //this class is used in the class above for setting the sp parameters public class SPParams { public string ParamName { get; set; } public object ParamValue { get; set; } } </code></pre> <p>The long running stored procedure has a few inserts and a few updates and the final time out call as below to simulate a long running process.</p> <pre><code>WAITFOR DELAY '0:02:00' </code></pre> <p><strong>The problem is</strong> when I call this stored procedure thru my web application deployed on my test server from client pc A, it hangs all further calls from the same client or any other user calling the webpage until the 2 minutes in the stored procedure have elapsed. When I run the stored procedure directly from sql management studio and run another sql statement side by side, the stored procedure takes 2 minutes to execute and the other sql statement executes immediately. It doesnt look like there is something on the database side that I need to change. What could be the problem with my code?</p> <p>Thanks</p>
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    1. COUse an `AsyncController` instead? You can also check on its status while it's still executing using something like this: http://stackoverflow.com/questions/2927284/need-an-asp-net-mvc-long-running-process-with-user-feedback
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    2. COSeems like sql-server is using different execution plans when you run the query directly versus being called from the website, you might need to do some digging with the profiler to see the actually generated queries and use something like "OPTION FORCE ORDER" to enforce a specific execution plan, besides I think the problem lies in the sql code not in the .net-code calling it
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    3. COIt's hard to comment why based on this, but I suspect you have bad indexing. Look at the query plan, fix the stored procedure
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