查询当前数据查询锁死语句SP_WHO3

CREATE PROCEDURE [dbo].[sp_who3] 
(  @SessionID INT = NULL ) 
AS
BEGIN
SELECT
    SPID                = er.session_id 
    ,STATUS             = ses.STATUS 
    ,[Login]            = ses.login_name 
    ,Host               = ses.host_name 
    ,BlkBy              = er.blocking_session_id 
    ,DBName             = DB_Name(er.database_id) 
    ,CommandType        = er.command 
    ,SQLStatement       = st.text 
    ,ObjectName         = OBJECT_NAME(st.objectid) 
    ,ElapsedMS          = er.total_elapsed_time 
    ,CPUTime            = er.cpu_time 
    ,IOReads            = er.logical_reads + er.reads 
    ,IOWrites           = er.writes 
    ,LastWaitType       = er.last_wait_type 
    ,StartTime          = er.start_time 
    ,Protocol           = con.net_transport 
    ,ConnectionWrites   = con.num_writes 
    ,ConnectionReads    = con.num_reads 
    ,ClientAddress      = con.client_net_address 
    ,Authentication     = con.auth_scheme 
FROM sys.dm_exec_requests er 
OUTER APPLY sys.dm_exec_sql_text(er.sql_handle) st 
LEFT JOIN sys.dm_exec_sessions ses 
ON ses.session_id = er.session_id 
LEFT JOIN sys.dm_exec_connections con 
ON con.session_id = ses.session_id 
WHERE er.session_id > 50 
    AND @SessionID IS NULL OR er.session_id = @SessionID 
ORDER BY
    er.blocking_session_id DESC
    ,er.session_id 
END