Introduction
As a SQL Server DBA, I often need a reference to information about locks. Microsoft recommends to use sp_lock system stored procedure to report locks information. This very useful procedure returns the information about SQL Server process ID, which lock the data, about locked database ID, about locked object ID, about locked index ID and about type of locking (type, resource, mode and status columns).
This is the results set of sp_lock stored procedure:
| spid dbid ObjId IndId Type Resource Mode Status ------ ------ ----------- ------ ---- ---------------- -------- ------ 1 1 0 0 DB S GRANT 6 1 0 0 DB S GRANT 7 1 0 0 DB S GRANT 8 1 0 0 DB S GRANT 9 1 0 0 DB S GRANT 9 2 0 0 DB S GRANT 9 1 117575457 0 TAB IS GRANT 10 1 0 0 DB S GRANT 11 5 0 0 DB S GRANT |
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The information, returned by sp_lock stored procedure, is needed in some clarification, because it’s difficult to understand database name, object name and index name by their ID numbers.
Microsoft provides an enhanced version of the sp_lock system stored procedure, which returns user name, host name, database name and object name also.
You can find this stored procedure here:
INF: sp_lock2 Returns Additional Locking Details
http://support.microsoft.com/support/kb/articles/Q255/5/96.ASP
This enhanced stored procedure works under SQL Server 7.0 as well, but has syntax error under SQL Server 2000. It does not return the name of an index also.
sp_lock2
Here you can find the new version of the sp_lock2 stored procedure for SQL Server 7.0 and SQL Server 2000. This version returns index name and object owner also.
You can use the following script to create the sp_lock2 procedure:
| 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, @indid int, @dbid int, @string Nvarchar(255) CREATE TABLE #locktable ( spid smallint ,loginname nvarchar(20) ,hostname nvarchar(30) ,dbid int ,dbname nvarchar(20) ,ObjOwner nvarchar(128) ,objId int ,ObjName nvarchar(128) ,IndId int ,IndName nvarchar(128) ,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 ,ObjOwner ,objId ,ObjName ,IndId ,IndName ,Type ,Resource ,Mode ,Status ) select convert (smallint, l.req_spid) ,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 ,ObjOwner ,objId ,ObjName ,IndId ,IndName ,Type ,Resource ,Mode ,Status ) select convert (smallint, l.req_spid) ,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, IndId FROM #locktable WHERE Type <>'DB' and Type <> 'FIL' OPEN lock_cursor FETCH NEXT FROM lock_cursor INTO @dbid, @ObjId, @IndId WHILE @@FETCH_STATUS = 0 BEGIN SELECT @string = 'USE ' + db_name(@dbid) + char(13) + 'update #locktable set ObjName = name, ObjOwner = USER_NAME(uid)' + ' from sysobjects where id = ' + convert(varchar(32),@objid) + ' and ObjId = ' + convert(varchar(32),@objid) + ' and dbid = ' + convert(varchar(32),@dbId) EXECUTE (@string) SELECT @string = 'USE ' + db_name(@dbid) + char(13) + 'update #locktable set IndName = i.name from sysindexes i ' + ' where i.id = ' + convert(varchar(32),@objid) + ' and i.indid = ' + convert(varchar(32),@indid) + ' and ObjId = ' + convert(varchar(32),@objid) + ' and dbid = ' + convert(varchar(32),@dbId) + ' and #locktable.indid = ' + convert(varchar(32),@indid) EXECUTE (@string) FETCH NEXT FROM lock_cursor INTO @dbid, @ObjId, @IndId END CLOSE lock_cursor DEALLOCATE lock_cursor SELECT * FROM #locktable return (0) -- END sp_lock2 GO |
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Literature
1. SQL Server Books Online
2. sp_lock (T-SQL)
http://support.microsoft.com/support/SQL/Content/inprodhlp/_sp_lock.asp
3. INF: sp_lock2 Returns Additional Locking Details
http://support.microsoft.com/support/kb/articles/Q255/5/96.ASP