select blocking_session_id, wait_duration_ms, session_id
from sys.dm_os_waiting_tasks
where blocking_session_id is not null

select top 10 *
from sys.dm_os_wait_stats
order by wait_time_ms desc

SELECT TOP 50 total_worker_time/execution_count AS [Avg CPU Time],
(SELECT SUBSTRING(text,statement_start_offset/2,(CASE WHEN      statement_end_offset = -1 then LEN(CONVERT(nvarchar(max), text)) * 2 ELSE statement_end_offset end -statement_start_offset)/2) FROM sys.dm_exec_sql_text(sql_handle)) AS query_text, *
FROM sys.dm_exec_query_stats
ORDER BY [Avg CPU Time] DESC

SELECT TOP 50
SUM(qs.total_worker_time) AS total_cpu_time,
SUM(qs.execution_count) AS total_execution_count,
COUNT(*) AS  number_of_statements,
qs.sql_handle
FROM sys.dm_exec_query_stats AS qs
GROUP BY qs.sql_handle
ORDER BY SUM(qs.total_worker_time) DESC

SELECT
total_cpu_time,
total_execution_count,
number_of_statements,
s2.text
ROM
(SELECT TOP 50
SUM(qs.total_worker_time) AS total_cpu_time,
SUM(qs.execution_count) AS total_execution_count,
COUNT(*) AS  number_of_statements,
qs.sql_handle
FROM
sys.dm_exec_query_stats AS qs
GROUP BY qs.sql_handle
ORDER BY SUM(qs.total_worker_time) DESC) AS stats
CROSS APPLY sys.dm_exec_sql_text(stats.sql_handle) AS s2

select top 25
sql_text.text,
sql_handle,
plan_generation_num,
execution_count,
dbid,
objectid
from sys.dm_exec_query_stats a
cross apply sys.dm_exec_sql_text(sql_handle) as sql_text
where plan_generation_num > 1
order by plan_generation_num desc

SELECT
highest_cpu_queries.plan_handle, highest_cpu_queries.total_worker_time, q.dbid, q.objectid, q.number, q.encrypted, q.[text]
from
(select top 50 qs.plan_handle,  qs.total_worker_time from sys.dm_exec_query_stats qs  order by qs.total_worker_time desc) as highest_cpu_queries
cross apply sys.dm_exec_sql_text(plan_handle) as q
order by highest_cpu_queries.total_worker_time desc

select *
from
sys.dm_exec_cached_plans
cross apply sys.dm_exec_query_plan(plan_handle)
where
cast(query_plan as nvarchar(max)) like '%Sort%'
or cast(query_plan as nvarchar(max)) like '%Hash Match%'

select * from sys.dm_exec_query_optimizer_info
where counter = 'optimizations' or counter = 'elapsed time'