![]() On a slow network, you can easily reproduce it by reducing the connection timeout to a lower value. If we don’t set the timeout value in SSMS, the query would run forever because the default timeout is zero.Ĭonnection timeout: This I can’t reproduce by management studio query easily. The query waited for 10 seconds because we caused blocking. It is not an SQL Server error but an error by the client. It is important to note the error number. The default value of query timeout in SSMS in 0 (which is infinite) Tools > Options in the menu would open below the window where the value can be set if needed. Here is the over-simplified repro of query timeout done via SQL Server Management Studio (SSMS). For example, if your intent is to Select a single row but you see a scan operator, that is a strong indication that you need to perform index or query tuning or need to update statistics. For a slow-running query, you may want to check the execution plan to verify that the statement is touching the rows which are needed. ![]() The BlkBy column will show the SPID of the blocking connection if the query is blocked. A quick way to check for blocking to run sp_who2 while the query is running. Query timeout: The reason a command/query runs longer than expected is commonly due to blocking or the need for query/index tuning or both. The next obvious question is – what should we do if we see such error? Within this time if the connection can’t be made, we would see the error.
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