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