This could be because the pre-login handshake failed or the server was unable to respond back in time. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgment. These are examples of connection or login time-out error messages:Ĭonnection Timeout Expired. At this stage, no query has been submitted to the server. The connection or login timeout occurs when the initial connection to the database server reaches a predefined time-out period. Query time-out is not the same as connection time-outĪ query time-out is different from a connection time-out or login time-out. SqlCommand command = new SqlCommand(queryString, connection) Ĭonsole.WriteLine("Got expected SqlException due to command timeout ") Using (SqlConnection connection = new SqlConnection(ConnectionString)) String ConnectionString = "Data Source=.\sql2019 Integrated Security=SSPI Initial Catalog=tempdb " Here's an ADO.NET code example with a time-out value set to 10 seconds: using System If the user's setting is correct and time-outs still occur, it's because of a query performance issue. Here's an example: ALTER EVENT SESSION ON SERVERĪDD EVENT sqlserver.existing_connection(SET collect_options_text=(1)ĪCTION(package0.event_sequence,package0.last_error,sqlos.system_thread_id,ntext_info,ssion_id,sqlserver.sql_text)),ĪDD EVENT sqlserver.login(SET collect_options_text=(1)ĪCTION(sqlos.system_thread_id,ntext_info,sqlserver.sql_text))įor more information, see Troubleshoot query performance difference between database application and SSMS.Ĭheck if the CommandTimeout setting is smaller than the expected query duration. Compare the SET options by collecting an Extended Events trace (login and connecting events with collect_options_text) and check the options_text column. If the queries are fast in SQLCMD and SSMS, but slow on the application side, change the queries to use the same SET options used in SQLCMD and SSMS. In SQLCMD and SSMS, the time-out value is set to 0 (no time limit) and the queries can be tested and investigated. If you observe a completed event is immediately followed by an attention event, and the duration of the completed event corresponds approximately to the time-out setting, you've identified the query. You can trace the attention event together with the sql_batch_completed and rpc_completed extended events, and correlate them on the same session_id. Use Extended Events or SQL Trace to identify the queries that cause the time-out errors. Making the query run faster is the recommended first target of your troubleshooting. That means that the query runs longer than the pre-defined query time-out value. Troubleshooting stepsīy far, the most common reason for query time-outs is underperforming queries. For more information, see Query time-out is not the same as connection time-out. The latter controls how long to wait for a successful connection and isn't involved in query execution. Query time-out is different from a connection time-out property.
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