Currently, All my SQL Request showing "System.ComponentModel.Win32Exception: The wait operation timed out"

Question

Suddenly, all of sql server requests showing "System.ComponentModel.Win32Exception: The wait operation timed out". What is the quickest way to find the issue?

Stack Trace: 


[Win32Exception (0x80004005): The wait operation timed out]

[SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1767866
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5352418
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +244
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1691
   System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +61
   System.Data.SqlClient.SqlDataReader.get_MetaData() +90
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +365
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) +1406
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +177
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +134
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41
   System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +10
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +140
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +316
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +86
   System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1481
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +21

I got the SQl that is causing the blocking issue by,

http://www.sqlskills.com/blogs/paul/script-open-transactions-with-text-and-plans/

Answer 1

Here how I was able to find the issue, First check all open transaction your database,

DBCC OPENTRAN ('Databse')

If there is an open transaction then Grab it's SPID and put it inside INPUTBUFFER

DBCC INPUTBUFFER (58)

This will give you the actual SQL. If you want,you can kill this transaction,

KILL 58

BTW, In my application I can use READ COMMITTED data,

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

Or

Select * from Products WITH NoLock

Here is another way to find the SQl quickly,

SELECT
    [s_tst].[session_id],
    [s_es].[login_name] AS [Login Name],
    DB_NAME (s_tdt.database_id) AS [Database],
    [s_tdt].[database_transaction_begin_time] AS [Begin Time],
    [s_tdt].[database_transaction_log_bytes_used] AS [Log Bytes],
    [s_tdt].[database_transaction_log_bytes_reserved] AS [Log Rsvd],
    [s_est].text AS [Last T-SQL Text],
    [s_eqp].[query_plan] AS [Last Plan]
FROM
    sys.dm_tran_database_transactions [s_tdt]
JOIN
    sys.dm_tran_session_transactions [s_tst]
ON
    [s_tst].[transaction_id] = [s_tdt].[transaction_id]
JOIN
    sys.[dm_exec_sessions] [s_es]
ON
    [s_es].[session_id] = [s_tst].[session_id]
JOIN
    sys.dm_exec_connections [s_ec]
ON
    [s_ec].[session_id] = [s_tst].[session_id]
LEFT OUTER JOIN
    sys.dm_exec_requests [s_er]
ON
    [s_er].[session_id] = [s_tst].[session_id]
CROSS APPLY
    sys.dm_exec_sql_text ([s_ec].[most_recent_sql_handle]) AS [s_est]
OUTER APPLY
    sys.dm_exec_query_plan ([s_er].[plan_handle]) AS [s_eqp]
ORDER BY
    [Begin Time] ASC;
GO

http://www.sqlskills.com/blogs/paul/script-open-transactions-with-text-and-plans/