How to monitor blocking in SQL Server 2005 and in SQL Server 2000 (271509)
The information in this article applies to:
- Microsoft SQL Server 2000 Desktop Engine (MSDE)
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Enterprise Evaluation Edition
- Microsoft SQL Server 2000 Personal Edition
- Microsoft SQL Server 2000 Standard Edition
- Microsoft SQL Server 2005 Standard Edition
- Microsoft SQL Server 2005 Workgroup
- Microsoft SQL Server 2005 Developer Edition
- Microsoft SQL Server 2005 Enterprise Edition
This article was previously published under Q271509 SUMMARY This article is an update for Microsoft SQL Server 2000 or later versions of SQL Server of
the following Microsoft Knowledge Base article, which applies to Microsoft SQL
Server 7.0:
251004 How to monitor SQL Server 7.0 blocking
This article documents the usage and design of a
stored procedure that you can use to diagnose blocking and performance issues.
For a description of how to understand and resolve blocking, see the following
article in the Microsoft Knowledge Base:
224453 Understanding and resolving SQL Server 7.0 blocking problems
In Microsoft SQL Server 2005, you can also use the Blocked Process Report event class in SQL Server Profiler to capture the information about a task that has been blocked for more than a specified amount of time. For more information about the Blocked Process Report event class, visit the following Microsoft Developer Network (MSDN) Web site: MORE INFORMATION The following description of the sp_blocker_pss80 stored procedure captures this information. This information also applies to SQL Server 2005. - The starting time (according to the computer that is
running SQL Server) so that this sampling of blocking can be time-aligned with
other performance information, such as a Microsoft Windows NT Performance
Monitor log or a SQL Profiler log.
- Information about connections to SQL Server, by querying
the sysprocesses system table.
- Information about lock resources, by querying the syslockinfo system table.
- Information about resource waits, by running DBCC
SQLPERF(WAITSTATS).
- The current running SQL Server Batch for connections that
are blocked by others or blocking others, by running the DBCC INPUTBUFFER
statement.
- The ending time, according to the computer that is running
SQL Server.
The stored procedure was created with the following
optimizations to reduce the effect on performance and blocking by running this
stored procedure:
- There is no output generated unless at least one connection
is waiting on a resource.
- The sysprocesses and syslockinfo system tables from the master database are queried directly, to increase performance and to
prevent this stored procedure from becoming blocked. Therefore, this stored
procedure is specific to Microsoft SQL Server 2000 or later versions of SQL Server.
- A small worktable is created by the cursor to obtain the
DBCC INPUTBUFFER output;
this should have no noticeable effect on the usage in the tempdb database.
- Because the blocking can change while gathering the
information, a fast mode exists, which increases performance by decreasing the
results to relevant rows of the sysprocesses and syslockinfo system tables.
- If trying to track non-lock resource waits, a latch mode
exists, which causes the lock output to be omitted.
This stored procedure is useful by running it from any query
tool. However, Microsoft suggests that you follow these steps to perform
blocking analysis:
- Create the stored procedure sp_blocker_pss80, which is included at the end of this article, from any query
tool while you are connected with a login that has sysadmin privileges on the SQL Server server or the instance of SQL Server
you plan to monitor.
- Create a script file with the following query to run the
stored procedure in a loop. Note that the delay should be between 5 and 60
seconds:
WHILE 1=1
BEGIN
EXEC master.dbo.sp_blocker_pss80
-- Or for fast mode
-- EXEC master.dbo.sp_blocker_pss80 @fast=1
-- Or for latch mode
-- EXEC master.dbo.sp_blocker_pss80 @latch=1
WAITFOR DELAY '00:00:15'
END
GO - This output is very useful when combined with a Microsoft
Windows NT Performance Monitor log and a SQL Profiler log, so creating both at
the same time is suggested. For information concerning which Profiler and
Performance Monitor events to capture, and for information about how to
interpret the results, see the following article in the Microsoft Knowledge
Base:
224453 Understanding and resolving SQL Server 7.0 or 2000 blocking problems
- Run the script file created in step 2 from either Isql.exe, the Osql.exe query tool, or the Sqlcmd utility in a Windows command prompt on the computer that is
running SQL Server for which you intend to monitor to prevent networking
problems from disconnecting the query tool. Following is an example command
line that you can use to start Osql.exe, which assumes that the client is run
from the computer that is running SQL Server, and that the script file name is
Checkblk.sql. Make sure to correct the -S parameter, and replace "server" with
the name of your SQL Server server (or "servername\instance" if you are
monitoring a named instance) . Also correct the -i parameter, and replace
"checkblk.sql" with the path and name to the script file created in step 2.
osql -E -Sserver -icheckblk.sql -ocheckblk.out -w2000 Note that you must use the other command line switches for the
following reasons:
- To prevent line wrapping in the output files which
makes it easier to read.
- To send the output to a file, specified with the -o
parameter, instead of to the screen so that if the query tool has problems, you
still have output until the query tool fails.
Following is the script to create the sp_blocker_pss80 stored procedure:
/*
Note: This script is meant to have 2 creations of the same stored procedure and one of them will fail
with either 207 errors or a 2714 error.
*/
use master
GO
if exists (select * from sysobjects where id = object_id('dbo.sp_blocker_pss80') and sysstat & 0xf = 4)
drop procedure dbo.sp_blocker_pss80
GO
create procedure dbo.sp_blocker_pss80 (@latch int = 0, @fast int = 1, @appname sysname='PSSDIAG')
as
--version 16SP3
if is_member('sysadmin')=0
begin
print 'Must be a member of the sysadmin group in order to run this procedure'
return
end
set nocount on
SET LANGUAGE 'us_english'
declare @spid varchar(6)
declare @blocked varchar(6)
declare @time datetime
declare @time2 datetime
declare @dbname nvarchar(128)
declare @status sql_variant
declare @useraccess sql_variant
set @time = getdate()
declare @probclients table(spid smallint, ecid smallint, blocked smallint, waittype binary(2), dbid smallint,
ignore_app tinyint, primary key (blocked, spid, ecid))
insert @probclients select spid, ecid, blocked, waittype, dbid,
case when convert(varchar(128),hostname) = @appname then 1 else 0 end
from sysprocesses where blocked!=0 or waittype != 0x0000
if exists (select spid from @probclients where ignore_app != 1 or waittype != 0x020B)
begin
set @time2 = getdate()
print ''
print '8.2 Start time: ' + convert(varchar(26), @time, 121) + ' ' + convert(varchar(12), datediff(ms,@time,@time2))
insert @probclients select distinct blocked, 0, 0, 0x0000, 0, 0 from @probclients
where blocked not in (select spid from @probclients) and blocked != 0
if (@fast = 1)
begin
print ''
print 'SYSPROCESSES ' + ISNULL (@@servername,'(null)') + ' ' + str(@@microsoftversion)
select spid, status, blocked, open_tran, waitresource, waittype,
waittime, cmd, lastwaittype, cpu, physical_io,
memusage, last_batch=convert(varchar(26), last_batch,121),
login_time=convert(varchar(26), login_time,121),net_address,
net_library, dbid, ecid, kpid, hostname, hostprocess,
loginame, program_name, nt_domain, nt_username, uid, sid,
sql_handle, stmt_start, stmt_end
from master..sysprocesses
where blocked!=0 or waittype != 0x0000
or spid in (select blocked from @probclients where blocked != 0)
or spid in (select spid from @probclients where blocked != 0)
print 'ESP ' + convert(varchar(12), datediff(ms,@time2,getdate()))
print ''
print 'SYSPROC FIRST PASS'
select spid, ecid, waittype from @probclients where waittype != 0x0000
if exists(select blocked from @probclients where blocked != 0)
begin
print 'Blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
print 'SPIDs at the head of blocking chains'
select spid from @probclients
where blocked = 0 and spid in (select blocked from @probclients where spid != 0)
if @latch = 0
begin
print 'SYSLOCKINFO'
select @time2 = getdate()
select spid = convert (smallint, req_spid),
ecid = convert (smallint, req_ecid),
rsc_dbid As dbid,
rsc_objid As ObjId,
rsc_indid As IndId,
Type = case rsc_type when 1 then 'NUL'
when 2 then 'DB'
when 3 then 'FIL'
when 4 then 'IDX'
when 5 then 'TAB'
when 6 then 'PAG'
when 7 then 'KEY'
when 8 then 'EXT'
when 9 then 'RID'
when 10 then 'APP' end,
Resource = substring (rsc_text, 1, 16),
Mode = case req_mode + 1 when 1 then NULL
when 2 then 'Sch-S'
when 3 then 'Sch-M'
when 4 then 'S'
when 5 then 'U'
when 6 then 'X'
when 7 then 'IS'
when 8 then 'IU'
when 9 then 'IX'
when 10 then 'SIU'
when 11 then 'SIX'
when 12 then 'UIX'
when 13 then 'BU'
when 14 then 'RangeS-S'
when 15 then 'RangeS-U'
when 16 then 'RangeIn-Null'
when 17 then 'RangeIn-S'
when 18 then 'RangeIn-U'
when 19 then 'RangeIn-X'
when 20 then 'RangeX-S'
when 21 then 'RangeX-U'
when 22 then 'RangeX-X'end,
Status = case req_status when 1 then 'GRANT'
when 2 then 'CNVT'
when 3 then 'WAIT' end,
req_transactionID As TransID, req_transactionUOW As TransUOW
from master.dbo.syslockinfo s,
@probclients p
where p.spid = s.req_spid
print 'ESL ' + convert(varchar(12), datediff(ms,@time2,getdate()))
end -- latch not set
end
else
print 'No blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
end -- fast set
else
begin -- Fast not set
print ''
print 'SYSPROCESSES ' + ISNULL (@@servername,'(null)') + ' ' + str(@@microsoftversion)
select spid, status, blocked, open_tran, waitresource, waittype,
waittime, cmd, lastwaittype, cpu, physical_io,
memusage, last_batch=convert(varchar(26), last_batch,121),
login_time=convert(varchar(26), login_time,121),net_address,
net_library, dbid, ecid, kpid, hostname, hostprocess,
loginame, program_name, nt_domain, nt_username, uid, sid,
sql_handle, stmt_start, stmt_end
from master..sysprocesses
print 'ESP ' + convert(varchar(12), datediff(ms,@time2,getdate()))
print ''
print 'SYSPROC FIRST PASS'
select spid, ecid, waittype from @probclients where waittype != 0x0000
if exists(select blocked from @probclients where blocked != 0)
begin
print 'Blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
print 'SPIDs at the head of blocking chains'
select spid from @probclients
where blocked = 0 and spid in (select blocked from @probclients where spid != 0)
if @latch = 0
begin
print 'SYSLOCKINFO'
select @time2 = getdate()
select spid = convert (smallint, req_spid),
ecid = convert (smallint, req_ecid),
rsc_dbid As dbid,
rsc_objid As ObjId,
rsc_indid As IndId,
Type = case rsc_type when 1 then 'NUL'
when 2 then 'DB'
when 3 then 'FIL'
when 4 then 'IDX'
when 5 then 'TAB'
when 6 then 'PAG'
when 7 then 'KEY'
when 8 then 'EXT'
when 9 then 'RID'
when 10 then 'APP' end,
Resource = substring (rsc_text, 1, 16),
Mode = case req_mode + 1 when 1 then NULL
when 2 then 'Sch-S'
when 3 then 'Sch-M'
when 4 then 'S'
when 5 then 'U'
when 6 then 'X'
when 7 then 'IS'
when 8 then 'IU'
when 9 then 'IX'
when 10 then 'SIU'
when 11 then 'SIX'
when 12 then 'UIX'
when 13 then 'BU'
when 14 then 'RangeS-S'
when 15 then 'RangeS-U'
when 16 then 'RangeIn-Null'
when 17 then 'RangeIn-S'
when 18 then 'RangeIn-U'
when 19 then 'RangeIn-X'
when 20 then 'RangeX-S'
when 21 then 'RangeX-U'
when 22 then 'RangeX-X'end,
Status = case req_status when 1 then 'GRANT'
when 2 then 'CNVT'
when 3 then 'WAIT' end,
req_transactionID As TransID, req_transactionUOW As TransUOW
from master.dbo.syslockinfo
print 'ESL ' + convert(varchar(12), datediff(ms,@time2,getdate()))
end -- latch not set
end
else
print 'No blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
end -- Fast not set
print 'DBCC SQLPERF(WAITSTATS)'
dbcc sqlperf(waitstats)
Print ''
Print '*********************************************************************'
Print 'Print out DBCC Input buffer for all blocked or blocking spids.'
Print '*********************************************************************'
declare ibuffer cursor fast_forward for
select distinct cast (spid as varchar(6)) as spid
from @probclients
where (spid <> @@spid) and
((blocked!=0 or (waittype != 0x0000 and ignore_app = 0))
or spid in (select blocked from @probclients where blocked != 0))
open ibuffer
fetch next from ibuffer into @spid
while (@@fetch_status != -1)
begin
print ''
print 'DBCC INPUTBUFFER FOR SPID ' + @spid
exec ('dbcc inputbuffer (' + @spid + ')')
fetch next from ibuffer into @spid
end
deallocate ibuffer
Print ''
Print '*******************************************************************************'
Print 'Print out DBCC OPENTRAN for active databases for all blocked or blocking spids.'
Print '*******************************************************************************'
declare ibuffer cursor fast_forward for
select distinct cast (dbid as varchar(6)) from @probclients
where dbid != 0
open ibuffer
fetch next from ibuffer into @spid
while (@@fetch_status != -1)
begin
print ''
set @dbname = db_name(@spid)
set @status = DATABASEPROPERTYEX(@dbname,'Status')
set @useraccess = DATABASEPROPERTYEX(@dbname,'UserAccess')
print 'DBCC OPENTRAN FOR DBID ' + @spid + ' ['+ @dbname + ']'
if @Status = N'ONLINE' and @UserAccess != N'SINGLE_USER'
dbcc opentran(@dbname)
else
print 'Skipped: Status=' + convert(nvarchar(128),@status)
+ ' UserAccess=' + convert(nvarchar(128),@useraccess)
print ''
if @spid = '2' select @blocked = 'Y'
fetch next from ibuffer into @spid
end
deallocate ibuffer
if @blocked != 'Y'
begin
print ''
print 'DBCC OPENTRAN FOR DBID 2 [tempdb]'
dbcc opentran ('tempdb')
end
print 'End time: ' + convert(varchar(26), getdate(), 121)
end -- All
else
print '8 No Waittypes: ' + convert(varchar(26), @time, 121) + ' '
+ convert(varchar(12), datediff(ms,@time,getdate())) + ' ' + ISNULL (@@servername,'(null)')
GO
create procedure dbo.sp_blocker_pss80 (@latch int = 0, @fast int = 1, @appname sysname='PSSDIAG')
as
--version 16
if is_member('sysadmin')=0
begin
print 'Must be a member of the sysadmin group in order to run this procedure'
return
end
set nocount on
declare @spid varchar(6)
declare @blocked varchar(6)
declare @time datetime
declare @time2 datetime
declare @dbname nvarchar(128)
declare @status sql_variant
declare @useraccess sql_variant
set @time = getdate()
declare @probclients table(spid smallint, ecid smallint, blocked smallint, waittype binary(2), dbid smallint,
ignore_app tinyint, primary key (blocked, spid, ecid))
insert @probclients select spid, ecid, blocked, waittype, dbid,
case when convert(varchar(128),hostname) = @appname then 1 else 0 end
from sysprocesses where blocked!=0 or waittype != 0x0000
if exists (select spid from @probclients where ignore_app != 1 or waittype != 0x020B)
begin
set @time2 = getdate()
print ''
print '8 Start time: ' + convert(varchar(26), @time, 121) + ' ' + convert(varchar(12), datediff(ms,@time,@time2))
insert @probclients select distinct blocked, 0, 0, 0x0000, 0, 0 from @probclients
where blocked not in (select spid from @probclients) and blocked != 0
if (@fast = 1)
begin
print ''
print 'SYSPROCESSES ' + ISNULL (@@servername,'(null)') + ' ' + str(@@microsoftversion)
select spid, status, blocked, open_tran, waitresource, waittype,
waittime, cmd, lastwaittype, cpu, physical_io,
memusage,last_batch=convert(varchar(26), last_batch,121),
login_time=convert(varchar(26), login_time,121), net_address,
net_library, dbid, ecid, kpid, hostname, hostprocess,
loginame, program_name, nt_domain, nt_username, uid, sid
from master..sysprocesses
where blocked!=0 or waittype != 0x0000
or spid in (select blocked from @probclients where blocked != 0)
or spid in (select spid from @probclients where waittype != 0x0000)
print 'ESP ' + convert(varchar(12), datediff(ms,@time2,getdate()))
print ''
print 'SYSPROC FIRST PASS'
select spid, ecid, waittype from @probclients where waittype != 0x0000
if exists(select blocked from @probclients where blocked != 0)
begin
print 'Blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
print 'SPIDs at the head of blocking chains'
select spid from @probclients
where blocked = 0 and spid in (select blocked from @probclients where spid != 0)
if @latch = 0
begin
print 'SYSLOCKINFO'
select @time2 = getdate()
select spid = convert (smallint, req_spid),
ecid = convert (smallint, req_ecid),
rsc_dbid As dbid,
rsc_objid As ObjId,
rsc_indid As IndId,
Type = case rsc_type when 1 then 'NUL'
when 2 then 'DB'
when 3 then 'FIL'
when 4 then 'IDX'
when 5 then 'TAB'
when 6 then 'PAG'
when 7 then 'KEY'
when 8 then 'EXT'
when 9 then 'RID'
when 10 then 'APP' end,
Resource = substring (rsc_text, 1, 16),
Mode = case req_mode + 1 when 1 then NULL
when 2 then 'Sch-S'
when 3 then 'Sch-M'
when 4 then 'S'
when 5 then 'U'
when 6 then 'X'
when 7 then 'IS'
when 8 then 'IU'
when 9 then 'IX'
when 10 then 'SIU'
when 11 then 'SIX'
when 12 then 'UIX'
when 13 then 'BU'
when 14 then 'RangeS-S'
when 15 then 'RangeS-U'
when 16 then 'RangeIn-Null'
when 17 then 'RangeIn-S'
when 18 then 'RangeIn-U'
when 19 then 'RangeIn-X'
when 20 then 'RangeX-S'
when 21 then 'RangeX-U'
when 22 then 'RangeX-X'end,
Status = case req_status when 1 then 'GRANT'
when 2 then 'CNVT'
when 3 then 'WAIT' end,
req_transactionID As TransID, req_transactionUOW As TransUOW
from master.dbo.syslockinfo s,
@probclients p
where p.spid = s.req_spid
print 'ESL ' + convert(varchar(12), datediff(ms,@time2,getdate()))
end -- latch not set
end
else
print 'No blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
end -- fast set
else
begin -- Fast not set
print ''
print 'SYSPROCESSES ' + ISNULL (@@servername,'(null)') + ' ' + str(@@microsoftversion)
select spid, status, blocked, open_tran, waitresource, waittype,
waittime, cmd, lastwaittype, cpu, physical_io,
memusage,last_batch=convert(varchar(26), last_batch,121),
login_time=convert(varchar(26), login_time,121), net_address,
net_library, dbid, ecid, kpid, hostname, hostprocess,
loginame, program_name, nt_domain, nt_username, uid, sid
from master..sysprocesses
print 'ESP ' + convert(varchar(12), datediff(ms,@time2,getdate()))
print ''
print 'SYSPROC FIRST PASS'
select spid, ecid, waittype from @probclients where waittype != 0x0000
if exists(select blocked from @probclients where blocked != 0)
begin
print 'Blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
print 'SPIDs at the head of blocking chains'
select spid from @probclients
where blocked = 0 and spid in (select blocked from @probclients where spid != 0)
if @latch = 0
begin
print 'SYSLOCKINFO'
select @time2 = getdate()
select spid = convert (smallint, req_spid),
ecid = convert (smallint, req_ecid),
rsc_dbid As dbid,
rsc_objid As ObjId,
rsc_indid As IndId,
Type = case rsc_type when 1 then 'NUL'
when 2 then 'DB'
when 3 then 'FIL'
when 4 then 'IDX'
when 5 then 'TAB'
when 6 then 'PAG'
when 7 then 'KEY'
when 8 then 'EXT'
when 9 then 'RID'
when 10 then 'APP' end,
Resource = substring (rsc_text, 1, 16),
Mode = case req_mode + 1 when 1 then NULL
when 2 then 'Sch-S'
when 3 then 'Sch-M'
when 4 then 'S'
when 5 then 'U'
when 6 then 'X'
when 7 then 'IS'
when 8 then 'IU'
when 9 then 'IX'
when 10 then 'SIU'
when 11 then 'SIX'
when 12 then 'UIX'
when 13 then 'BU'
when 14 then 'RangeS-S'
when 15 then 'RangeS-U'
when 16 then 'RangeIn-Null'
when 17 then 'RangeIn-S'
when 18 then 'RangeIn-U'
when 19 then 'RangeIn-X'
when 20 then 'RangeX-S'
when 21 then 'RangeX-U'
when 22 then 'RangeX-X'end,
Status = case req_status when 1 then 'GRANT'
when 2 then 'CNVT'
when 3 then 'WAIT' end,
req_transactionID As TransID, req_transactionUOW As TransUOW
from master.dbo.syslockinfo
print 'ESL ' + convert(varchar(12), datediff(ms,@time2,getdate()))
end -- latch not set
end
else
print 'No blocking via locks at ' + convert(varchar(26), @time, 121)
print ''
end -- Fast not set
print 'DBCC SQLPERF(WAITSTATS)'
dbcc sqlperf(waitstats)
Print ''
Print '*********************************************************************'
Print 'Print out DBCC Input buffer for all blocked or blocking spids.'
Print '*********************************************************************'
declare ibuffer cursor fast_forward for
select distinct cast (spid as varchar(6)) as spid
from @probclients
where (spid <> @@spid) and
((blocked!=0 or (waittype != 0x0000 and ignore_app = 0))
or spid in (select blocked from @probclients where blocked != 0))
open ibuffer
fetch next from ibuffer into @spid
while (@@fetch_status != -1)
begin
print ''
print 'DBCC INPUTBUFFER FOR SPID ' + @spid
exec ('dbcc inputbuffer (' + @spid + ')')
fetch next from ibuffer into @spid
end
deallocate ibuffer
Print ''
Print '*******************************************************************************'
Print 'Print out DBCC OPENTRAN for active databases for all blocked or blocking spids.'
Print '*******************************************************************************'
declare ibuffer cursor fast_forward for
select distinct cast (dbid as varchar(6)) from @probclients
where dbid != 0
open ibuffer
fetch next from ibuffer into @spid
while (@@fetch_status != -1)
begin
print ''
set @dbname = db_name(@spid)
set @status = DATABASEPROPERTYEX(@dbname,'Status')
set @useraccess = DATABASEPROPERTYEX(@dbname,'UserAccess')
print 'DBCC OPENTRAN FOR DBID ' + @spid + ' ['+ @dbname + ']'
if @Status = N'ONLINE' and @UserAccess != N'SINGLE_USER'
dbcc opentran(@dbname)
else
print 'Skipped: Status=' + convert(nvarchar(128),@status)
+ ' UserAccess=' + convert(nvarchar(128),@useraccess)
print ''
if @spid = '2' select @blocked = 'Y'
fetch next from ibuffer into @spid
end
deallocate ibuffer
if @blocked != 'Y'
begin
print ''
print 'DBCC OPENTRAN FOR DBID 2 [tempdb]'
dbcc opentran ('tempdb')
end
print 'End time: ' + convert(varchar(26), getdate(), 121)
end -- All
else
print '8 No Waittypes: ' + convert(varchar(26), @time, 121) + ' '
+ convert(varchar(12), datediff(ms,@time,getdate())) + ' ' + ISNULL (@@servername,'(null)')
GO
| Modification Type: | Minor | Last Reviewed: | 9/11/2006 |
|---|
| Keywords: | kbhowto kbinfo KB271509 kbAudDeveloper kbAudITPRO |
|---|
|