INF: sp_lock2 Returns Additional Locking Details

Summary

The sp_lock2 procedure is an enhanced version of the sp_lock SQL Server system stored procedure (see SQL Server 7.0 Books Online for more documentation). In addition to the output of sp_lock, sp_lock2 returns the names for users, databases, and tables involved in the current locks, and therefore it can help you analyze a locking scenario.

More Information

The sp_lock2 procedure returns the following additional information to sp_lock:
  • User names for the listed system process IDs (SPIDs).
  • Database names for the listed databases.
  • Table names for the listed database objects.
You can use the following script to create the sp_lock2 procedure for SQL Server 7.0:
USE master
GO
create procedure sp_lock2
@spid1 int = NULL, /* server process id to check for locks */
@spid2 int = NULL /* other process id to check for locks */
as

set nocount on
/*
** Show the locks for both parameters.
*/
declare @objid int,
@dbid int,
@string Nvarchar(255)

CREATE TABLE #locktable
(
spid smallint
,loginname nvarchar(20)
,hostname nvarchar(30)
,dbid int
,dbname nvarchar(20)
,objId int
,ObjName nvarchar(128)
,IndId int
,Type nvarchar(4)
,Resource nvarchar(16)
,Mode nvarchar(8)
,Status nvarchar(5)
)

if @spid1 is not NULL
begin
INSERT #locktable
(
spid
,loginname
,hostname
,dbid
,dbname
,objId
,ObjName
,IndId
,Type
,Resource
,Mode
,Status
)
select convert (smallint, l.req_spid)
--,coalesce(substring (user_name(req_spid), 1, 20),'')
,coalesce(substring (s.loginame, 1, 20),'')
,coalesce(substring (s.hostname, 1, 30),'')
,l.rsc_dbid
,substring (db_name(l.rsc_dbid), 1, 20)
,l.rsc_objid
,''
,l.rsc_indid
,substring (v.name, 1, 4)
,substring (l.rsc_text, 1, 16)
,substring (u.name, 1, 8)
,substring (x.name, 1, 5)
from master.dbo.syslockinfo l,
master.dbo.spt_values v,
master.dbo.spt_values x,
master.dbo.spt_values u,
master.dbo.sysprocesses s
where l.rsc_type = v.number
and v.type = 'LR'
and l.req_status = x.number
and x.type = 'LS'
and l.req_mode + 1 = u.number
and u.type = 'L'
and req_spid in (@spid1, @spid2)
and req_spid = s.spid
end
/*
** No parameters, so show all the locks.
*/
else
begin
INSERT #locktable
(
spid
,loginname
,hostname
,dbid
,dbname
,objId
,ObjName
,IndId
,Type
,Resource
,Mode
,Status
)
select convert (smallint, l.req_spid)
--,coalesce(substring (user_name(req_spid), 1, 20),'')
,coalesce(substring (s.loginame, 1, 20),'')
,coalesce(substring (s.hostname, 1, 30),'')
,l.rsc_dbid
,substring (db_name(l.rsc_dbid), 1, 20)
,l.rsc_objid
,''
,l.rsc_indid
,substring (v.name, 1, 4)
,substring (l.rsc_text, 1, 16)
,substring (u.name, 1, 8)
,substring (x.name, 1, 5)
from master.dbo.syslockinfo l,
master.dbo.spt_values v,
master.dbo.spt_values x,
master.dbo.spt_values u,
master.dbo.sysprocesses s
where l.rsc_type = v.number
and v.type = 'LR'
and l.req_status = x.number
and x.type = 'LS'
and l.req_mode + 1 = u.number
and u.type = 'L'
and req_spid = s.spid
order by spID
END
DECLARE lock_cursor CURSOR
FOR SELECT dbid, ObjId FROM #locktable WHERE Type ='TAB'

OPEN lock_cursor
FETCH NEXT FROM lock_cursor INTO @dbid, @ObjId
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @string =
'USE ' + db_name(@dbid) + char(13)
+ 'UPDATE #locktable SET ObjName = object_name('
+ convert(varchar(32),@objId) + ') WHERE dbid = ' + convert(varchar(32),@dbId)
+ ' AND objid = ' + convert(varchar(32),@objId)

EXECUTE (@string)
FETCH NEXT FROM lock_cursor INTO @dbid, @ObjId
END
CLOSE lock_cursor
DEALLOCATE lock_cursor


SELECT * FROM #locktable
return (0)
-- END sp_lock2
GO
Properties

Article ID: 255596 - Last Review: Mar 20, 2013 - Revision: 1

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