In this six-minute video, Allen Kinsel shares multiple ways to quickly determine whether SQL Server is the root cause or a symptom of your performance problem.
Demo Code
/* See all requests */
select * from
sys.dm_exec_requests r
OUTER APPLY sys.dm_exec_sql_text(r.sql_handle) AS st
/*Filter out the noise */
select * from
sys.dm_exec_requests r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS st