sql server性能分析执行计划重用次数

 分析sql执行计划重用次数，查看绑定变量使用情况

select total_elapsed_time / execution_count 平均时间,total_logical_reads/execution_count 逻辑读,
usecounts 重用次数,SUBSTRING(d.text, (statement_start_offset/2) + 1,
         ((CASE statement_end_offset 
          WHEN -1 THEN DATALENGTH(text)
          ELSE statement_end_offset END 
            - statement_start_offset)/2) + 1) 语句执行 from sys.dm_exec_cached_plans a
cross apply sys.dm_exec_query_plan(a.plan_handle) c
,sys.dm_exec_query_stats b
cross apply sys.dm_exec_sql_text(b.sql_handle) d
where a.plan_handle=b.plan_handle and total_logical_reads/execution_count>4000
ORDER BY total_elapsed_time / execution_count DESC;

　　文章出至http://www.cnblogs.com/zping/archive/2008/07/15/1243364.html