MSSQL性能优化之sqlserver常用资源消耗sql

SELECT * FROM sys.[sysprocesses] WHERE [spid]>50 AND DB_NAME([dbid])='db_name'


SELECT * FROM [sys].[dm_exec_sessions] WHERE [session_id]>50

SELECT TOP 10


[session_id],


[request_id],


[start_time] AS '开始时间',


[status] AS '状态',


[command] AS '命令',


dest.[text] AS 'sql语句', 


DB_NAME([database_id]) AS '数据库名',


[blocking_session_id] AS '正在阻塞其他会话的会话ID',


[wait_type] AS '等待资源类型',


[wait_time] AS '等待时间',


[wait_resource] AS '等待的资源',


[reads] AS '物理读次数',


[writes] AS '写次数',


[logical_reads] AS '逻辑读次数',


[row_count] AS '返回结果行数'


FROM sys.[dm_exec_requests] AS der 


CROSS APPLY 


sys.[dm_exec_sql_text](der.[sql_handle]) AS dest 


WHERE [session_id]>50 AND DB_NAME(der.[database_id])='db_name' 


ORDER BY [cpu_time] DESC

SELECT TOP 10 


dest.[text] AS 'sql语句'


FROM sys.[dm_exec_requests] AS der 


CROSS APPLY 


sys.[dm_exec_sql_text](der.[sql_handle]) AS dest 


WHERE [session_id]>50 


ORDER BY [cpu_time] DESC

SELECT TOP 10


total_worker_time/execution_count AS avg_cpu_cost, plan_handle,


execution_count,


(SELECT SUBSTRING(text, statement_start_offset/2 + 1,


(CASE WHEN statement_end_offset = -1


THEN LEN(CONVERT(nvarchar(max), text)) * 2


ELSE statement_end_offset


END - statement_start_offset)/2)


FROM sys.dm_exec_sql_text(sql_handle)) AS query_text


FROM sys.dm_exec_query_stats


ORDER BY [avg_cpu_cost] DESC

SELECT


DatabaseName = DB_NAME(database_id)


,[Number Indexes Missing] = count(*)


FROM sys.dm_db_missing_index_details


GROUP BY DB_NAME(database_id)


ORDER BY 2 DESC;

SELECT TOP 10 


[Total Cost] = ROUND(avg_total_user_cost * avg_user_impact * (user_seeks + user_scans),0) 


, avg_user_impact


, TableName = statement


, [EqualityUsage] = equality_columns 


, [InequalityUsage] = inequality_columns


, [Include Cloumns] = included_columns


FROM sys.dm_db_missing_index_groups g 


INNER JOIN sys.dm_db_missing_index_group_stats s 


ON s.group_handle = g.index_group_handle 


INNER JOIN sys.dm_db_missing_index_details d 


ON d.index_handle = g.index_handle


ORDER BY [Total Cost] DESC;