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])='dwms4'  
ORDER BY [cpu_time] DESC;


--在SSMS里选择以文本格式显示结果
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
 [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',
 der.[wait_type] AS '等待资源类型',
 [wait_time] AS '等待时间',
 [wait_resource] AS '等待的资源',
 [dows].[waiting_tasks_count] AS '当前正在进行等待的任务数',
 [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 
 INNER JOIN [sys].[dm_os_wait_stats] AS dows 
 ON der.[wait_type]=[dows].[wait_type]
 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;


USE master
 GO
 --如果要指定数据库就把注释去掉
 SELECT * FROM sys.[sysprocesses] WHERE [spid]>50 --AND DB_NAME([dbid])='gposdb'
 SELECT COUNT(*) 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])='dwms4'  
ORDER BY [cpu_time] DESC

;


(@LOCATIONID nvarchar(9),@GOODTYPE int,@VOLTYPE int,@cnt int)
  SELECT TOP (@cnt) LOC.* FROM t_wmsLocation LOC WHERE LOC.STATE = 0 AND goodsType =@GOODTYPE AND LOC.VOLTYPE = @VOLTYPE 
  AND NOT EXISTS (SELECT 1 FROM T_WMSSTOCK WHERE LOCATIONID = LOC.LOCATIONID)  AND   LOCATIONID < @LOCATIONID  ORDER BY LOC.layer,LOC.locationId DESC; 
   SELECT TOP (@cnt) LOC.* FROM t_wmsLocation LOC WHERE LOC.STATE = 0 AND goodsType =@GOODTYPE AND LOC.VOLTYPE = @VOLTYPE 
   AND NOT EXISTS (SELECT 1 FROM T_WMSSTOCK WHERE LOCATIONID = LOC.LOCATIONID)  AND   LOCATIONID > @LOCATIONID  ORDER BY LOC.layer,LOC.locationId ;


   --查看CPU数和user scheduler数目
 SELECT cpu_count,scheduler_count FROM sys.dm_os_sys_info
 --查看最大工作线程数
SELECT max_workers_count FROM sys.dm_os_sys_info；


SELECT
scheduler_address,
scheduler_id,
cpu_id,
status,
current_tasks_count,
current_workers_count,active_workers_count
FROM sys.dm_os_schedulers;


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;

/*
avg_total_user_cost:减少的用户查询的平均成本
avg_user_impact:户查询可能获得的平均百分比收益
user_scans:扫描次数
user_seeks:查找次数。
equality_columns: 哪个字段缺失了索引(where 后面的筛选字段)
included_columns:查询的涵盖列（简单来讲就是 select 后面的字段）。
*/


SELECT  avg_user_impact,
        avg_total_user_cost, 
        avg_total_user_cost * avg_user_impact * ( user_scans + user_seeks ) AS PossibleImprovement ,  
        last_user_seek ,  
        last_user_scan ,  
        [statement] AS [Object] ,  
        'CREATE INDEX [IDX_' + CONVERT(VARCHAR(32), GS.group_handle) + '_'  
        + CONVERT(VARCHAR(32), D.index_handle) + '_'  
        + REPLACE(REPLACE(REPLACE([STATEMENT], ']', ''), '[', ''), '.', '')  
        + ']' + ' ON ' + [statement] + ' (' + ISNULL(equality_columns, '')  
        + CASE WHEN equality_columns IS NOT NULL  
                    AND inequality_columns IS NOT NULL THEN ','  
               ELSE ''  
          END + ISNULL(inequality_columns, '') + ')' + ISNULL(' INCLUDE ('  
                                                              + included_columns  
                                                              + ')', '') AS Create_Index_Syntax  
FROM    sys.dm_db_missing_index_groups AS G  
        INNER JOIN sys.dm_db_missing_index_group_stats AS GS ON G.index_group_handle = GS.group_handle  
        INNER JOIN sys.dm_db_missing_index_details AS D ON G.index_handle = D.index_handle  
ORDER BY PossibleImprovement DESC ;