查看sqlserver 2008中效能低下的語句

標籤：

經常使用這個語句來查看效能低下的sql語句：

SELECT creation_time  N‘語句編譯時間‘        ,last_execution_time  N‘上次執行時間‘        ,total_physical_reads N‘物理讀取總次數‘        ,total_logical_reads/execution_count N‘每次邏輯讀次數‘        ,total_logical_reads  N‘邏輯讀取總次數‘        ,total_logical_writes N‘邏輯寫入總次數‘        ,execution_count  N‘執行次數‘        ,total_worker_time/1000 N‘所用的CPU總時間ms‘        ,total_elapsed_time/1000  N‘總花費時間ms‘        ,(total_elapsed_time / execution_count)/1000  N‘平均時間ms‘        ,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,         ((CASE statement_end_offset          WHEN -1 THEN DATALENGTH(st.text)          ELSE qs.statement_end_offset END            - qs.statement_start_offset)/2) + 1) N‘執行語句‘FROM sys.dm_exec_query_stats AS qsCROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) stwhere SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,         ((CASE statement_end_offset          WHEN -1 THEN DATALENGTH(st.text)          ELSE qs.statement_end_offset END            - qs.statement_start_offset)/2) + 1) not like ‘%fetch%‘             and qs.execution_count>10000 and            (total_elapsed_time / execution_count)/1000>150ORDER BY  total_elapsed_time / execution_count DESC;

轉自：http://blog.csdn.net/yangzhawen/article/details/7239392

查看sqlserver 2008中效能低下的語句