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SqlServer2008，系统巨慢，8核CPU都达到99%，内存占用超过10G，使用下边sql确定罪魁祸首，建索引改sql。
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select q.query_hash,
q.number_of_entries, t.text as sample_query, p.query_plan as sample_plan select top 20 query_hash,
count(*) as number_of_entries, min(sql_handle) as sample_sql_handle, mi n(plan_handle) as sample_plan_handle from sys.dm_exec_query_stats
cross apply sys.dm_exec_sql_text(q.sample_sql_handle) as t
cross apply sys.dm_exec_query_plan(q.sample_plan_handle) as p
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select q.total_cpu_time,
q.total_execution_count, t.text as sample_query, p.query_plan as sample_plan sum(total_worker_time) as total_cpu_time, sum(execution_count) as total_execution_count, count(*) as number_of_statements, plan_handle from
sys.dm_exec_query_stats order by sum(total_worker_time) desc
cross apply sys.dm_exec_sql_text(q.plan_handle) as t
cross apply sys.dm_exec_query_plan(q.plan_handle) as p
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