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POdbo.TempGetStateItemExclusive3 called repeatedly
 

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    <p>I am investigating a problem with our website that uses SQL server to manage sessions. The website is asp.net webforms based around the sitecore CMS. We have the same code in various environments e.g. QA, staging, and production. </p> <p>In production, what we are seeing is, periodically, we get a rapidly rising CPU usage that does not correlate in any way to traffic to the server. Along with this cpu spike, we are seeing a corresponding spike in network I/O. </p> <p>Our monitoring software does not differentiate between traffic out to the internet and traffic to the DB server; however, what we are seeing on the DB server is <strong>literally hundreds of calls per second to <code>dbo.TempGetStateItemExclusive3</code></strong> in the asp session database, all for the same session id, and no corresponding amount of page requests coming into the web servers.</p> <p>With the same code and config, we simply do not see this behaviour for other environments. We also do not see it for other session ids, just this one specific one.</p> <p>Deleting the row from the database simply results in it being recreated with the same session id.</p> <p>UPDATE</p> <p>I have found this error in the event log:</p> <pre><code>Violation of PRIMARY KEY constraint 'PK__ASPState__C9F49290145C0A3F'. Cannot insert duplicate key in object 'dbo.ASPStateTempSessions'. The duplicate key value is (sessionidwiththeproblem). The statement has been terminated. Stack trace: at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean\ breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand\ cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler,\ TdsParserStateObject stateObj) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds,\ RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior,\ RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior,\ RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult\ result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at System.Web.SessionState.SqlSessionStateStore.SqlExecuteNonQueryWithRetry(SqlCommand\ cmd, Boolean ignoreInsertPKException, String id) </code></pre> <p>Anyone any ideas how a duplicate session id could possibly be attempted to be created?</p>
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    1. USBen Robinson
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    1. COHave you been able to see a pattern with how long these spikes normally last, how frequently they occur, and / or what time of day they occur?
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    2. COThis is just kind of a shot in the dark, but are your app pools configured (significantly) differently between the different environments? I'm wondering if the mass of DB calls lines up with some kind of scheduled / regular cycling of the production app pool (app pool resets, and the ASP.NET runtime is restoring all the non-expired Sessions from SQL Server at once).
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    3. COThe spikes last until the app pool is recycled. This usually clears the problem down for a little while. There is no real pattern they seems to happen at random. We previously had app pool recycling at a scheduled time every day, we have had to change this to every 2 hours to try and mitigate this issue. If it helps we have 2 web front end servers load balanced using sticky sessions. Our ISP techs tells us there is no corresponding traffic coming in over the LB so it's like some runaway thread is making these calls.
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