How to view statements with low execution efficiency in SQL Server

sql server中，如果想知道有哪些语句是执行效率不高的，应该如何查看呢？下面就将为您介绍sql server中如何查看执行效率不高的语句，供您参考。 在测量功能时，先以下命令清除sql server的缓存 dbcc freeProcCache 在点击某个按钮,执行完后,再执行下面语句,就可以知道系统运行什么Sql和多少次了,其主要慢语句是那些了; SELECT creation_time  N ‘语句编译时间‘          ,last_execution_time  N ‘上次执行时间‘          ,total_physical_reads N ‘物理读取总次数‘          ,total_logical_reads/execution_count N ‘每次逻辑读次数‘          ,total_logical_reads  N ‘逻辑读取总次数‘          ,total_logical_writes N ‘逻辑写入总次数‘          ,execution_count  N ‘执行次数‘          ,total_worker_time/1000 N ‘所用的CPU总时间ms‘          ,total_elapsed_time/1000  N ‘总花费时间ms‘          ,(total_elapsed_time / execution_count)/1000  N ‘平均时间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 ‘执行语句‘ FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st where 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%‘ ORDER BY  total_elapsed_time / execution_count DESC;

How to view statements with low execution efficiency in SQL Server