如何检查SQL Server阻塞

--查询应用程序的等待

SELECT TOP 10

wait_type,waiting_tasks_count AS tasks,

wait_time_ms,max_wait_time_ms AS max_wait,

signal_wait_time_ms AS signal

FROM sys.dm_os_wait_stats

ORDER BY wait_time_ms DESC

--查询在任一时刻所有授权给当前执行事务或当前执行事务等待的锁

SELECT

request_session_id AS spid,resource_type AS rt,

resource_database_id AS rdb,

(CASE resource_type

 WHEN 'OBJECT' THEN OBJECT_NAME(resource_associated_entity_id)

 WHEN 'DATABASE' THEN ' '

 ELSE (SELECT OBJECT_NAME(object_id)

        FROM sys.partitions WHERE hobt_id=resource_associated_entity_id)

 END)AS objname,

 resource_description AS rd,

 request_mode AS rm,

 request_status AS rs

FROM sys.dm_tran_locks

--阻塞的生存期和正被阻塞事务执行的SQL语句

SELECT

t1.resource_type,

'databse'=DB_NAME(resource_database_id),

'blk object'=resource_associated_entity_id,

request_mode,request_session_id,wait_duration_ms,

(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,

t1.resource_description

FROM sys.dm_tran_locks AS t1,

sys.dm_os_waiting_tasks t2,

sys.dm_exec_requests t3

WHERE

t1.lock_owner_address=t2.resource_address AND

t1.request_request_id=t3.request_id AND

t2.session_id=t3.session_id