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Tip of the Day
Language: Enterprise
Expertise: Intermediate
Jan 21, 2000

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


See Who Is Blocking Your SQL Server

If you have ever monitored any blocking problems in SQL Server, you know that sp_who only shows you the spid (SQL Server's internal Process ID) that is causing the blocking for each spid that is blocked. Often a blocked spid is shown as causing blocking for another spid. To see the spid (or spids) that started the whole mess off, execute the following SQL:
  
SELECT p.spid
,convert(char(12), d.name) db_name
, program_name
, convert(char(12), l.name) login_name
, convert(char(12), hostname) hostname
, cmd
, p.status
, p.blocked
, login_time
, last_batch
, p.spid
FROM      master..sysprocesses p
JOIN      master..sysdatabases d ON p.dbid =  d.dbid
JOIN      master..syslogins l ON p.suid = l.suid
WHERE     p.blocked = 0
AND       EXISTS (  SELECT 1
          FROM      master..sysprocesses p2
          WHERE     p2.blocked = p.spid )
We built this into our own version of sp_who, called sp_hywho. See the listing below.

Code for sp_hywho:

 if exists (select * from sysobjects 
   where id = object_id('dbo.sp_hywho') 
   and sysstat & 0xf = 4)
   drop procedure dbo.sp_hywho
GO

Create Procedure sp_hywho
(    @vcDBName sysname = NULL )
AS

SET NOCOUNT ON

IF EXISTS ( SELECT 1
   FROM   master..sysprocesses p
   WHERE   p.blocked = 0 
   AND   EXISTS ( SELECT 1
      FROM   master..sysprocesses p2
      WHERE   p2.blocked = p.spid ) )
BEGIN
   PRINT "Blocking caused by:"
   PRINT ""
   SELECT   p.spid
   ,convert(char(12), d.name) db_name
   , program_name
   , convert(char(12), l.name) login_name
   , convert(char(12), hostname) hostname
   , cmd           
   , p.status        
   , p.blocked
   , login_time                  
   , last_batch 
   , p.spid
   FROM   master..sysprocesses p
   JOIN   master..sysdatabases d ON p.dbid =  d.dbid 
   JOIN   master..syslogins l ON p.suid = l.suid 
   WHERE   p.blocked = 0 
   AND   EXISTS ( SELECT 1
      FROM   master..sysprocesses p2
      WHERE   p2.blocked = p.spid ) 
   AND   (p.dbid = DB_ID( @vcDBName ) OR @vcDBName IS NULL)
   ORDER BY 2,IsNull(Ltrim(program_name),"ZZZZZZZZZ"),4,5
   PRINT ""
END

SELECT   p.spid
,convert(char(12), d.name) db_name
, program_name
, convert(char(12), l.name) login_name
, convert(char(12), hostname) hostname
, cmd           
, p.status        
, p.blocked
, login_time                  
, last_batch 
, p.spid
FROM   master..sysprocesses p
JOIN   master..sysdatabases d ON p.dbid =  d.dbid 
JOIN   master..syslogins l ON p.suid = l.suid 
WHERE   (p.dbid = DB_ID( @vcDBName ) OR @vcDBName IS NULL)
ORDER BY 2,IsNull(Ltrim(program_name),"ZZZZZZZZZ"),4,5


SET NOCOUNT OFF

GO

if exists (select * from sysobjects 
   where id = object_id('dbo.sp_hywho') 
   and sysstat & 0xf = 4)
   GRANT EXEC ON dbo.sp_hywho TO PUBLIC
GO
David Satz
 
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