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Question : SQL Server Blocking
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I am looking for your best MSSQL scripts and techniques for troubleshooting query blocking. I am looking for something a little more substantial then "select * from sysprocess where blocked !=0". Please post actual scripts and techniques. I have read all the technet literature and want some case studies for how other people have resolved issues.
Links to good articles would be appreciated also. SQL Server Profiler configurations would be accepted too. I am really looking for good troubleshooting scripts here, I want to develop a "best practices" manual. The person who simply copies and pastes a sophisticated script with some brief notes regarding their experience with it will most likely receive the points.
Thanks in Advance,
Integer
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Answer : SQL Server Blocking
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I configure a job that runs an sp every two minutes (you can do whatever) that checks for blocking. If there is a problem, the sp sends an email with info on the block including the inputbuffer of what caused it. I keep these sps in a resource db called "Admin."
You might think running a job every two minutes will not catch everything, but over time, on a busy environment, you will indeed understand what is causing your problems.
You can also setup an alert type "SQL Server event alert" for severity 016 - Miscellaneous User Errors since blocking/deadlocks are considered user errors. You can have this email you each time a 016 occurs.
CREATE procedure Admin_monitor_deadlock
as
set nocount on
declare @ServerName varchar (20)
declare @DeadlockCount int
declare @Message varchar (400)
declare @Subject varchar (400)
declare @Query varchar (800)
declare @Spid varchar (10)
declare @Recipients varchar (40)
declare @SendEMail varchar (3)
select @ServerName = @@servername
set @SendEmail = 'NO'
set @Message = ''
--enter email address:
set @Recipients ='[email protected]'
if not exists (select * from master.dbo.sysmessages where error =60001)
exec sp_addmessage 60001, 16,
'User error: blocking or deadlock occurred. ServerName:%s SPID:%s'
if exists ( select * from INFORMATION_SCHEMA.TABLES
where table_name = 'Admin_blk' )
drop table Admin.dbo.Admin_blk
select spid,
blocked,
hostname=substring (hostname, 1, 10),
progname=substring(program_name, 1, 10),
cmd=substring(cmd, 1, 100),
status,
physical_io,
waittype
into admin.dbo.Admin_blk
from master..sysprocesses (nolock)
where blocked != 0
delete from admin.dbo.Admin_blk
where blocked in (select spid from admin.dbo.Admin_blk)
select @DeadlockCount=count(*)
from master..sysprocesses (nolock)
where spid in (select blocked from admin.dbo.Admin_blk)
--print @DeadlockCount
if (@DeadlockCount > 0)
begin
select getdate()
select @ServerName=@@servername
select @Spid=spid
from master..sysprocesses (nolock)
where spid in (select blocked from admin.dbo.Admin_blk)
raiserror(60001, 16, 1, @serverName, @spid) with log
set @Query ='
select Blocking_spid = spid,
loginame=substring(loginame,1,10),
hostname=substring (hostname, 1, 10),
progname=substring(program_name, 1,10),
cmd=substring(cmd, 1, 100),
status, physical_io,
waittype
from master..sysprocesses (nolock)
where spid in (select blocked from admin.dbo.Admin_blk)
'
exec (@Query)
if (@SendEmail = 'YES')
begin
set @Subject = @ServerName + ': Deadlock '
exec master..xp_sendmail
@recipients = @Recipients,
@message = @Message,
@subject = @Subject,
@query = @Query
end
set @Query = 'dbcc inputbuffer ('+@Spid+')'
exec (@Query)
if (@SendEmail = 'YES')
begin
set @Subject = @ServerName+ ': Deadlock Input buffer on ' +@ServerName
exec master..xp_sendmail
@recipients = @Recipients,
@message = @Message,
@subject = @Subject,
@query = @Query
end
set @Query ='exec master..sp_lock'
exec (@Query)
if @sendEMail ='YES'
begin
exec master..xp_sendmail
@recipients = @Recipients,
@message = @Message,
@subject = @Subject,
@query = @Query
set @Subject = @ServerName+': Deadlock Input buffer'
end
end
GO
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