SqlServer性能优化，查看CPU、内存占用大的会话及SQL语句

1，查看CPU占用量最高的会话及SQL语句
 
select spid,cmd,cpu,physical_io,memusage,
(select top 1 [text] from ::fn_get_sql(sql_handle)) sql_text
from master..sysprocesses order by cpu desc,physical_io desc
 
2，查看缓存重用次数少，内存占用大的SQL语句
 
SELECT TOP 100 usecounts, objtype, p.size_in_bytes,[sql].[text] 
FROM sys.dm_exec_cached_plans p OUTER APPLY sys.dm_exec_sql_text (p.plan_handle) sql 
ORDER BY usecounts,p.size_in_bytes  desc
 
 
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