alert on blocking chains via email

,

This is a script I use to watch for blocking chains on a server there are four variables to be set. @Duration tells it how long to run. This will be an active thread for the duration. @IntervalSec how often to poll for blocking. @maxwaittime time in miliseconds a thread that is blocked that you wish to allert on 30000 is 30 seconds. If a thread has been blocked that long alerts will start going out. @recivers, people who get the emails.

You can set it up as a job to start it will always show as executing until the duration runs out. I have it set to run every minute just in case there is a thread exit it will restart the job again.

---------------------------------------------------------------------------------------------------
--pull input buffer from blocked threads 
--This query pulls spids and then processes those spids through the dbcc inputbuffer to get
--what they are doing. This is to aid in troubleshooting problems by getting as much detail
--as possible on running spids
---------------------------------------------------------------------------------------------------
/*
--this is the table to write the data to
CREATE TABLE [dbo].[blocking] (
[tstamp] [datetime] NOT NULL ,
[spid] [int] NULL ,
[blocked] [int] NULL ,
[waittype] [varchar] (255) NULL ,
[waittime] [bigint] NULL ,
[physical_io] [bigint] NULL ,
[cpu_in_seconds] [bigint] NULL ,
[memusage] [bigint] NULL ,
[name] [nvarchar] (128)  NOT NULL ,
[open_tran] [tinyint] NULL ,
[status] [varchar] (20)  NULL ,
[hostname] [varchar] (50)  NULL ,
[program_name] [varchar] (100)  NULL ,
[cmd] [varchar] (100)  NULL ,
[nt_domain] [varchar] (100)  NULL ,
[nt_username] [varchar] (200)  NULL ,
[loginame] [varchar] (100)  NULL ,
[EventType] [varchar] (255)  NULL ,
[Parameters] [varchar] (255)  NULL ,
[EventInfo] [varchar] (255)  NULL ,
[text] [text]  NULL 
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

*/set nocount on

use <database you want data written to>

CREATE TABLE #tbl_fn_get_sql (
[dbid] [smallint] NULL ,
[objectid] [int] NULL ,
[number] [smallint] NULL ,
[encrypted] [bit] NOT NULL ,
[text] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL 
) 

create table #active_spids
(
spid int,
blocked int,
waittype varchar(255),
waittime bigint,
physical_io bigint,
cpu bigint,
memusage bigint,
dbid int,
open_tran tinyint,
status varchar(20),
hostname varchar(50),
program_name varchar(100),
cmd varchar(100),
nt_domain varchar(100),
nt_username varchar(200),
loginame varchar(100),
[sql_handle] [binary] (20) NOT NULL ,
[stmt_start] [int] NOT NULL ,
[stmt_end] [int] NOT NULL 

)

create table #active_spids_info
(
spid int,
blocked int,
waittype varchar(255),
waittime bigint,
physical_io bigint,
cpu bigint,
memusage bigint,
dbid int,
open_tran tinyint,
status varchar(20),
hostname varchar(50),
program_name varchar(100),
cmd varchar(100),
nt_domain varchar(100),
nt_username varchar(200),
loginame varchar(100),
[sql_handle] [binary] (20) NOT NULL ,
[stmt_start] [int] NOT NULL ,
[stmt_end] [int] NOT NULL,
EventType varchar(255),
Parameters varchar(255),
EventInfo varchar(255),
[text] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL 
)

create table #event_info
(
spid int,
EventType varchar(255),
Parameters varchar(255),
EventInfo varchar(255)
)


DECLARE 
@TerminateGatheringDT  datetime -- when to stop gathering
, @WaitFor_Interval datetime
, @LastRecordingDT datetime
, @RecordingDT datetime
, @myError int            -- Local copy of @@ERROR
, @myRowCount int         -- Local copy of @@RowCount
, @msgText nvarchar(4000) -- for error messages
, @dbname varchar(255)
, @svrname varchar(255)
, @datestart as datetime
, @Duration datetime -- Duration of data collection
, @IntervalSec int -- Approx sec in the gathering interval
, @tstamp varchar(255)
, @spid1 varchar(255)
, @dbname1 varchar(255)
, @status varchar(255)
, @hostname varchar(255)
, @programname varchar(255)
, @cmd varchar(255)
, @nt_domain varchar(255)
, @nt_username varchar(255)
, @loginame varchar(255)
, @text varchar(8000)
, @msg varchar(8000)
, @sub varchar(8000)
, @timestamp as datetime
, @spid int
, @sqlhandle binary(20)
, @tsqlhandle as varchar(255)
, @waittime varchar(255)
, @waittype varchar(255)
, @buffer varchar(255)
, @maxwaittime int
, @recivers varchar(8000)
, @diffmsec bigint
set nocount on

set @Duration = '08:00:00' -- Duration of data collection
set @IntervalSec = 30 -- Approx sec in the gathering interval
set @maxwaittime = 28000 -- This is in miliseconds!!!
set @recivers = '<email addresses here>' --who all gets the emails
SET @diffmsec = DATEDIFF(ms
                             , CONVERT(datetime, '00:00:00', 8)
                             , @Duration)

SELECT @WaitFor_Interval = DATEADD (s, @IntervalSec , 
CONVERT (datetime, '00:00:00', 108)
                                 )
     , @TerminateGatheringDT = DATEADD(ms, @diffmsec,getdate())

WHILE getdate() <= @TerminateGatheringDT BEGIN

truncate table #active_spids
truncate table #active_spids_info
truncate table #event_info
truncate table #tbl_fn_get_sql

insert into #active_spids
select 
spid,
blocked,
waittype,
waittime,
physical_io,
cpu,
[memusage],
a.dbid,
open_tran,
a.status,
hostname,
program_name,
cmd,
nt_domain,
nt_username,
loginame,
[sql_handle],
[stmt_start],
[stmt_end]
from
(
select 
spid,
blocked,
'waittype' = 
CASE
WHEN waittype = 0x0001 THEN 'Exclusive table lock'
WHEN waittype = 0x0003 THEN 'Exclusive intent lock'
WHEN waittype = 0x0004 THEN 'Shared table lock'
WHEN waittype = 0x0005 THEN 'Exclusive page lock'
WHEN waittype = 0x0006 THEN 'Shared page lock'
WHEN waittype = 0x0007 THEN 'Update page lock'
WHEN waittype = 0x0013 THEN 'Buffer resource lock (exclusive) request'
WHEN waittype = 0x0013 THEN 'Miscellaneous I/O (sort, audit, direct xact log I/O)'
WHEN waittype = 0x0020 THEN 'Buffer in I/O'
WHEN waittype = 0x0022 THEN 'Buffer being dirtied'
WHEN waittype = 0x0023 THEN 'Buffer being dumped'
WHEN waittype = 0x0081 THEN 'Write the TLog'
WHEN waittype = 0x0200 THEN 'Parallel query coordination'
WHEN waittype = 0x0208 THEN 'Parallel query coordination'
WHEN waittype = 0x0420 THEN 'Buffer I/O latch'
WHEN waittype = 0x0421 THEN 'Buffer I/O latch'
WHEN waittype = 0x0422 THEN 'Buffer I/O latch'
WHEN waittype = 0x0423 THEN 'Buffer I/O latch'
WHEN waittype = 0x0424 THEN 'Buffer I/O latch'
WHEN waittype = 0x0425 THEN 'Buffer I/O latch'
WHEN waittype = 0x0800 THEN 'Network I/O completion'
WHEN waittype = 0x8001 THEN 'Exclusive table lock'
WHEN waittype = 0x8003 THEN 'Exclusive intent lock'
WHEN waittype = 0x8004 THEN 'Shared table lock'
WHEN waittype = 0x8005 THEN 'Exclusive page lock'
WHEN waittype = 0x8006 THEN 'Shared page lock'
WHEN waittype = 0x8007 THEN 'Update page lock'
WHEN waittype = 0x8011 THEN 'Buffer resource lock (shared) request'
ELSE'OLEDB/Miscellaneous'
END,
waittime,
physical_io,
cpu,
[memusage],
dbid,
open_tran,
status,
hostname,
program_name,
cmd,
nt_domain,
nt_username,
loginame,
[sql_handle],
[stmt_start],
[stmt_end]
 from 
master.dbo.sysprocesses with(NOLOCK)
where 
blocked > 0 and waittime > @maxwaittime
union all
select 
spid,
blocked,
'waittype' = 
CASE
WHEN waittype = 0x0001 THEN 'Exclusive table lock'
WHEN waittype = 0x0003 THEN 'Exclusive intent lock'
WHEN waittype = 0x0004 THEN 'Shared table lock'
WHEN waittype = 0x0005 THEN 'Exclusive page lock'
WHEN waittype = 0x0006 THEN 'Shared page lock'
WHEN waittype = 0x0007 THEN 'Update page lock'
WHEN waittype = 0x0013 THEN 'Buffer resource lock (exclusive) request'
WHEN waittype = 0x0013 THEN 'Miscellaneous I/O (sort, audit, direct xact log I/O)'
WHEN waittype = 0x0020 THEN 'Buffer in I/O'
WHEN waittype = 0x0022 THEN 'Buffer being dirtied'
WHEN waittype = 0x0023 THEN 'Buffer being dumped'
WHEN waittype = 0x0081 THEN 'Write the TLog'
WHEN waittype = 0x0200 THEN 'Parallel query coordination'
WHEN waittype = 0x0208 THEN 'Parallel query coordination'
WHEN waittype = 0x0420 THEN 'Buffer I/O latch'
WHEN waittype = 0x0421 THEN 'Buffer I/O latch'
WHEN waittype = 0x0422 THEN 'Buffer I/O latch'
WHEN waittype = 0x0423 THEN 'Buffer I/O latch'
WHEN waittype = 0x0424 THEN 'Buffer I/O latch'
WHEN waittype = 0x0425 THEN 'Buffer I/O latch'
WHEN waittype = 0x0800 THEN 'Network I/O completion'
WHEN waittype = 0x8001 THEN 'Exclusive table lock'
WHEN waittype = 0x8003 THEN 'Exclusive intent lock'
WHEN waittype = 0x8004 THEN 'Shared table lock'
WHEN waittype = 0x8005 THEN 'Exclusive page lock'
WHEN waittype = 0x8006 THEN 'Shared page lock'
WHEN waittype = 0x8007 THEN 'Update page lock'
WHEN waittype = 0x8011 THEN 'Buffer resource lock (shared) request'
ELSE'OLEDB/Miscellaneous'
END,
waittime,
physical_io,
cpu,
[memusage],
dbid,
open_tran,
status,
hostname,
program_name,
cmd,
nt_domain,
nt_username,
loginame,
[sql_handle],
[stmt_start],
[stmt_end]
from 
master.dbo.sysprocesses with(NOLOCK)
where
spid in
( 
select 
blocked 
from 
master.dbo.sysprocesses with(NOLOCK)
where 
blocked > 0 and waittime > @maxwaittime
) 
) a
order by blocked

--loop through the spids without a cursor
while (select count(spid) from #active_spids) > 0
begin
set @spid = (select top 1 spid from #active_spids order by spid)
--grab the top spid
insert into #active_spids_info 
(
spid,
blocked,
waittype,
waittime,
physical_io,
cpu,
[memusage],
dbid,
open_tran,
status,
hostname,
program_name,
cmd,
nt_domain,
nt_username,
loginame,
[sql_handle],
[stmt_start],
[stmt_end] 
)
select top 1
spid,
blocked,
waittype,
waittime,
physical_io,
cpu,
[memusage],
dbid,
open_tran,
status,
hostname,
program_name,
cmd,
nt_domain,
nt_username,
loginame,
[sql_handle],
[stmt_start],
[stmt_end] 
from 
#active_spids 
order by 
spid

insert into #event_info (EventType,Parameters,EventInfo) EXEC('DBCC INPUTBUFFER (' + @spid + ') WITH NO_INFOMSGS')
--get the inputbuffer 

exec('update #event_info set spid = '+@spid+' where spid IS NULL')
--add the spid to the input buffer data

select @sqlhandle = sql_handle from #active_spids where spid = @spid

insert into #tbl_fn_get_sql 
select * from ::fn_get_sql(@sqlhandle)

UPDATE #active_spids_info 
SET 
#active_spids_info.text = #tbl_fn_get_sql.text
FROM
#active_spids_info,#tbl_fn_get_sql
WHERE 
#active_spids_info.spid = @spid

truncate table #tbl_fn_get_sql

delete from #active_spids where spid = @spid
--remove the spid processed
end

UPDATE #active_spids_info 
SET 
#active_spids_info.EventType = #event_info.EventType,
#active_spids_info.Parameters = #event_info.Parameters,
#active_spids_info.EventInfo = #event_info.EventInfo
FROM
#active_spids_info, #event_info
WHERE 
#active_spids_info.spid = #event_info.spid
--join all the info into one table

set @timestamp = getdate()
--select statement to return results 
insert into management.dbo.blocking
select@timestamp as tstamp,
a.spid,
a.blocked,
a.waittype,
a.waittime,
a.physical_io,
(a.cpu/1000) as cpu_in_seconds,
a.[memusage],
b.[name],
a.open_tran,
a.status,
a.hostname,
a.program_name,
a.cmd,
a.nt_domain,
a.nt_username,
a.loginame,
a.EventType,
a.Parameters,
a.EventInfo,
a.text
from 
#active_spids_info a
inner join
master.dbo.sysdatabases b
on
a.dbid = b.dbid
if ((select max(tstamp) from management.dbo.blocking where blocked = 0) = @timestamp)
begin
select @sub = 'Blocking Issues - '+cast(serverproperty('servername') as varchar(255))

select 
@tstamp = tstamp,
@spid1 = spid,
@status = status,
@hostname = isnull(hostname,''),
@programname = isnull(program_name,''),
@cmd = isnull(cmd,''),
@nt_domain = isnull(nt_domain,''),
@nt_username = isnull(nt_username,''),
@loginame = isnull(loginame,''),
@text = isnull([text],''),
@waittime = (select max(waittime) from management.dbo.blocking where tstamp = (select max(tstamp) from management.dbo.blocking)),
@waittype = isnull(waittype,''),
@buffer = isnull(EventInfo,'')

from  
management.dbo.blocking 
where 
tstamp = (
select max(tstamp) 
from 
management.dbo.blocking) and blocked = 0


select @msg ='The user below is at the head of the blocking chain on the listed server:'+char(13)+
'__________________________________________________________________________'+char(13)+
'TimeStamp: '+@tstamp+char(13)+
'SPID: '+@spid1+char(13)+
'Login Name: '+@loginame+char(13)+
'NT Domain: '+@nt_domain+char(13)+
'NT Username: '+@nt_username+char(13)+
'Host Name: '+@hostname+char(13)+
'Command: '+@cmd+char(13)+
'Program Name: '+@programname+char(13)+
'Wait Type: '+@waittype+char(13)+
'Maximum Wait Time For Blocked Thread: '+@waittime+char(13)+char(13)+
'Input Buffer: '+@buffer+char(13)+
'Status: '+@status+char(13)+
'SQL String:'+char(13)+
'--WARNING CAN BE LONG AND MAY NOT BE THE WHOLE TEXT!!!--'+char(13)+@text

EXEC master.dbo.xp_sendmail @recipients = @recivers, 
   @subject = @sub,
   @message = @msg


/*
--just used to debug and make sure email is running
EXEC master.dbo.xp_sendmail @recipients = 'wbrown@thescooterstore.com', 
@subject = 'test',
@message = 'test'
*/end

WAITFOR DELAY @WaitFor_Interval   -- delay      
END

drop table #active_spids
drop table #active_spids_info
drop table #event_info
drop table #tbl_fn_get_sql
set nocount off

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