sql 最昂贵的查询

Posted 2021-05-13

exec sp_who2 active; --activity monitor
dbcc inputbuffer(52) --show command text for process
sp_helptext 'procname' --show stored proc text

SELECT TOP 50
	[Avg. MultiCore/CPU time(sec)] = qs.total_worker_time / 1000000 / qs.execution_count,
	[Total MultiCore/CPU time(sec)] = qs.total_worker_time / 1000000,
	[Avg. Elapsed Time(sec)] = qs.total_elapsed_time / 1000000 / qs.execution_count,
	[Total Elapsed Time(sec)] = qs.total_elapsed_time / 1000000,
	qs.execution_count,
	[Avg. I/O] = (total_logical_reads + total_logical_writes) / qs.execution_count,
	[Total I/O] = total_logical_reads + total_logical_writes,
	Query = SUBSTRING(qt.[text], (qs.statement_start_offset / 2) + 1,
		(
			(
				CASE qs.statement_end_offset
					WHEN -1 THEN DATALENGTH(qt.[text])
					ELSE qs.statement_end_offset
				END - qs.statement_start_offset
			) / 2
		) + 1
	),
	Batch = qt.[text],
	[DB] = DB_NAME(qt.[dbid]),
	qs.last_execution_time,
	qp.query_plan
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.[sql_handle]) AS qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) AS qp
where qs.execution_count > 5	--more than 5 occurences
ORDER BY [Total MultiCore/CPU time(sec)] DESC