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longest running query using T-SQL


There might be situations where u might be getting requests from users saying that the entire website is slow or the application is slow. Situations like these could be because of a slow running query where users might have an impression of the enire server being slow and u might be getting Support Tickets related to that. Well Situations like these may demand you to look into some loong running queries on the server. Sometimes these long running queries may even be the cause for a complete server slowness depending on your isolation levels.

The main culprit in scenarios like these could be a long running query, which might be causing slowness.The best way to troubleshoot is to start looking for these queries one by one and identifying those queries and then troubleshooting the perfomance issue for that query. The below script helps us identify that.

In the image below shown the query is run on my personal laptop where no long running queries are present. However when u run the same on a production machine you will get a lot of queries being displayed in the results.

Before You Proceed We recommend you to read our Disclaimer below

Please test the script on your testing or Dev (development) environment's which are expendable before executing or implementing these scripts over production or realtime environment. Also get the Aprovalfrom your DBA before executing these scripts

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Find Backup History on a Sql-Server

 SELECT deqs.last_execution_time AS [Time], dest.TEXT AS [Query]
 FROM sys.dm_exec_query_stats AS deqs
 CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest
 ORDER BY deqs.last_execution_time DESC

you can download the Script here here