SQL Server进阶 SQL优化

找到消耗内存最多的SQL

SELECT mg.granted_memory_kb, mg.session_id, t.text, qp.query_plan 
FROM sys.dm_exec_query_memory_grants AS mg
CROSS APPLY sys.dm_exec_sql_text(mg.sql_handle) AS t
CROSS APPLY sys.dm_exec_query_plan(mg.plan_handle) AS qp
ORDER BY 1 DESC OPTION (MAXDOP 1)

 是不使用Not In，而使用Not Exists作为替代