SQL server 查看当前执行sql的状态 --处理阻塞

查看正在执行的sql状态

 SELECT  
 der.[session_id],der.[blocking_session_id],  
 sp.lastwaittype,sp.hostname,sp.program_name,sp.loginame,  
 der.[start_time] AS '开始时间',  
 der.[status] AS '状态',  
 dest.[text] AS 'sql语句',  
 DB_NAME(der.[database_id]) AS '数据库名',  
 der.[wait_type] AS '等待资源类型',  
 der.[wait_time] AS '等待时间',  
 der.[wait_resource] AS '等待的资源',  
 der.[logical_reads] AS '逻辑读次数'  
 FROM sys.[dm_exec_requests] AS der  
 INNER JOIN master.dbo.sysprocesses AS sp ON der.session_id=sp.spid  
 CROSS APPLY  sys.[dm_exec_sql_text](der.[sql_handle]) AS dest  
 --WHERE [session_id]>50 AND session_id<>@@SPID  
 ORDER BY 

紧急处理思路

1、重点关注 状态为suspended 的sql、
2、查看 suspended状态的sql 的blocking_session_id -此为阻塞原因
3、可以将 blocking_session_id 重复最多的优先kill

kill 【blocking_session_id】

处理思路

当发生阻塞时、根据blocking_session_id寻找最初造成阻塞的会话、
如果发现 最初阻塞的会话 WaitType = SOS_SCHEDULER_YIELD

SOS_SCHEDULER_YIELD等待类型是一个任务自愿放弃当前的资源占用，让给其他任务使用。
　　Yelding的发生：是指SCHEDULER上运行的Worker都是非抢占式的, 在 SCHEDULER上Worker由于资源等待，让出当前Worker给其它Worker就叫Yielding。 SOS_SCHEDULER_YIELD 等待的情况可能由于cpu压力过高

此时可以关注下查询编译以来 cpu耗时总量最多的前50条(Total_woker_time)
并对此尝试优化

select
'total_worker_time(ms)'=(total_worker_time/1000),
q.[text], DB_NAME(dbid),OBJECT_NAME(objectid),
execution_count,
'max_worker_time(ms)'=(max_worker_time/1000),
'last_worker_time(ms)'=(last_worker_time/1000),
'min_worker_time(ms)'=(min_worker_time/1000),
'max_elapsed_time(ms)'=(max_elapsed_time/1000),
'min_elapsed_time(ms)'=(min_elapsed_time/1000),
'last_elapsed_time(ms)'=(last_elapsed_time/1000),
total_physical_reads,
last_physical_reads,
min_physical_reads,
max_physical_reads,
total_logical_reads,
last_logical_reads,
max_logical_reads,
creation_time,
last_execution_time
from
(select top 50 qs.* from sys.dm_exec_query_stats qs order by qs.total_worker_time desc)
as highest_cpu_queries cross apply sys.dm_exec_sql_text(highest_cpu_queries.plan_handle) as q
order by highest_cpu_queries.total_worker_time DESC