Massive Query blocking other Processes

Hi
We are having a Sharepoint 2010 server and we have deployed a dot net custom application on it. Recently the application was working slow and the same was observed on out of box created lists using the out of box UI.
We found that it was originating from a SQL query which was blocking other processes.
Now this problem, occurs intermittently and goes away on its own in some time(~10 minutes). The query responsible is :
SELECT TOP(@NUMROWS) t1.[Type] AS c0, UserData.[ntext2], UserData.[datetime1], UserData.[nvarchar10], t6.[nvarchar5] AS c14c15, UserData.[float2], UserData.[int8], UserData.[tp_ItemOrder], UserData.[nvarchar1], t15.[nvarchar6] AS c36c34, UserData.[ntext1], UserData.[int7], UserData.[float1], UserData.[nvarchar19], UserData.[tp_ID], UserData.[nvarchar5], t5.[nvarchar4] AS c12c13, UserData.[bit1], t11.[nvarchar3] AS c24c25, UserData.[int11], t14.[nvarchar6] AS c30c34, t15.[tp_ID] AS c36c32, UserData.[tp_GUID], t1.[ProgId] AS c42, t1.[SortBehavior] AS c1, UserData.[tp_Author], UserData.[tp_Editor], UserData.[int1], UserData.[int6], UserData.[nvarchar13], UserData.[ntext5], UserData.[datetime4], UserData.[nvarchar18], UserData.[tp_ContentTypeId], t8.[nvarchar3] AS c18c19, UserData.[int10], t15.[tp_Created] AS c36c35, UserData.[tp_WorkflowVersion], t1.[LeafName] AS c37, UserData.[tp_Version], t1.[Id] AS c4, UserData.[nvarchar4], UserData.[nvarchar9], t14.[tp_ID] AS c30c32, t1.[TimeLastModified] AS c40, UserData.[tp_IsCurrentVersion], UserData.[tp_HasCopyDestinations], UserData.[tp_Level], t4.[nvarchar3] AS c10c11, UserData.[int5], t10.[nvarchar3] AS c22c23, UserData.[nvarchar12], UserData.[ntext4], UserData.[datetime3], UserData.[nvarchar17], t2.[nvarchar3] AS c6c7, UserData.[nvarchar20], UserData.[datetime8], UserData.[tp_HasAttachment], UserData.[tp_Modified], CASE WHEN DATALENGTH(t1.DirName) = 0 THEN t1.LeafName WHEN DATALENGTH(t1.LeafName) = 0 THEN t1.DirName ELSE t1.DirName + N'/' + t1.LeafName END AS c2, UserData.[nvarchar3], UserData.[nvarchar8], t7.[nvarchar3] AS c16c17, t13.[Status1] AS c28c29, t14.[tp_Created] AS c30c35, t15.[nvarchar4] AS c36c33, UserData.[tp_UIVersion], t1.[ItemChildCount] AS c43, UserData.[tp_CopySource], UserData.[nvarchar11], UserData.[ntext3], UserData.[datetime2], UserData.[nvarchar16], UserData.[tp_InstanceID], t3.[nvarchar3] AS c8c9, UserData.[int4], t9.[nvarchar3] AS c20c21, UserData.[int9], UserData.[float3], UserData.[datetime7], UserData.[tp_UIVersionString], t1.[TimeCreated] AS c38, t1.[ScopeId] AS c5, UserData.[nvarchar2], UserData.[nvarchar7], t14.[nvarchar4] AS c30c33, t15.[nvarchar1] AS c36c31, t1.[ClientId] AS c41, UserData.[int3], t12.[nvarchar3] AS c26c27, UserData.[datetime6], UserData.[tp_Created], UserData.[tp_ModerationStatus], UserData.[nvarchar6], UserData.[tp_WorkflowInstanceID], t1.[FolderChildCount] AS c44, t1.[MetaInfo] AS c3, UserData.[nvarchar14], t14.[nvarchar1] AS c30c31, UserData.[int2], UserData.[datetime5], t1.[DirName] AS c39 FROM AllUserData AS UserData WITH(INDEX=AllUserData_PK) INNER JOIN Docs AS t1 WITH(NOLOCK) ON (UserData.[tp_RowOrdinal] = 0) AND (t1.SiteId=UserData.tp_SiteId) AND (t1.SiteId = @SITEID) AND (t1.ParentId = UserData.tp_ParentId) AND (t1.Id = UserData.tp_DocId) AND ( (UserData.tp_Level = 1) ) AND (t1.Level = UserData.tp_Level) AND (t1.IsCurrentVersion = 1) AND (t1.Level = 1 OR t1.Level = 2) AND (UserData.[tp_ListID] =@LISTID) AND (UserData.[tp_CalculatedVersion] = 0 ) AND (UserData.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (UserData.[tp_DeleteTransactionId] = 0x ) LEFT OUTER LOOP JOIN AllUserData AS t2 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int1]=t2.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t2.[tp_RowOrdinal] = 0) AND ( (t2.tp_Level = 1) ) AND (t2.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t2.[tp_CalculatedVersion] = 0 ) AND (t2.[tp_DeleteTransactionId] = 0x ) AND (t2.tp_ListId = @L2) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t3 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int2]=t3.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t3.[tp_RowOrdinal] = 0) AND ( (t3.tp_Level = 1) ) AND (t3.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t3.[tp_CalculatedVersion] = 0 ) AND (t3.[tp_DeleteTransactionId] = 0x ) AND (t3.tp_ListId = @L4) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t4 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int3]=t4.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t4.[tp_RowOrdinal] = 0) AND ( (t4.tp_Level = 1) ) AND (t4.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t4.[tp_CalculatedVersion] = 0 ) AND (t4.[tp_DeleteTransactionId] = 0x ) AND (t4.tp_ListId = @L5) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t5 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int4]=t5.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t5.[tp_RowOrdinal] = 0) AND ( (t5.tp_Level = 1) ) AND (t5.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t5.[tp_CalculatedVersion] = 0 ) AND (t5.[tp_DeleteTransactionId] = 0x ) AND (t5.tp_ListId = @L5) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t6 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int5]=t6.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t6.[tp_RowOrdinal] = 0) AND ( (t6.tp_Level = 1) ) AND (t6.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t6.[tp_CalculatedVersion] = 0 ) AND (t6.[tp_DeleteTransactionId] = 0x ) AND (t6.tp_ListId = @L6) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t7 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int6]=t7.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t7.[tp_RowOrdinal] = 0) AND ( (t7.tp_Level = 1) ) AND (t7.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t7.[tp_CalculatedVersion] = 0 ) AND (t7.[tp_DeleteTransactionId] = 0x ) AND (t7.tp_ListId = @L7) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t8 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int7]=t8.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t8.[tp_RowOrdinal] = 0) AND ( (t8.tp_Level = 1) ) AND (t8.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t8.[tp_CalculatedVersion] = 0 ) AND (t8.[tp_DeleteTransactionId] = 0x ) AND (t8.tp_ListId = @L8) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t9 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int8]=t9.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t9.[tp_RowOrdinal] = 0) AND ( (t9.tp_Level = 1) ) AND (t9.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t9.[tp_CalculatedVersion] = 0 ) AND (t9.[tp_DeleteTransactionId] = 0x ) AND (t9.tp_ListId = @L9) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t10 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int9]=t10.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t10.[tp_RowOrdinal] = 0) AND ( (t10.tp_Level = 1) ) AND (t10.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t10.[tp_CalculatedVersion] = 0 ) AND (t10.[tp_DeleteTransactionId] = 0x ) AND (t10.tp_ListId = @L10) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t11 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int10]=t11.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t11.[tp_RowOrdinal] = 0) AND ( (t11.tp_Level = 1) ) AND (t11.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t11.[tp_CalculatedVersion] = 0 ) AND (t11.[tp_DeleteTransactionId] = 0x ) AND (t11.tp_ListId = @L11) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t12 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[int11]=t12.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t12.[tp_RowOrdinal] = 0) AND ( (t12.tp_Level = 1) ) AND (t12.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t12.[tp_CalculatedVersion] = 0 ) AND (t12.[tp_DeleteTransactionId] = 0x ) AND (t12.tp_ListId = @L12) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN Workflow AS t13 WITH(NOLOCK) ON ( CAST ( CAST (UserData.[nvarchar18]AS VARBINARY) AS UNIQUEIDENTIFIER)=t13.[ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t13.SiteId = @SITEID) AND (t13.WebId = @WEBID) AND (t13.ListId = UserData.tp_ListId) AND (t13.ItemId = UserData.tp_Id) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t14 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[tp_Author]=t14.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t14.[tp_RowOrdinal] = 0) AND ( (t14.tp_Level = 1) ) AND (t14.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t14.[tp_CalculatedVersion] = 0 ) AND (t14.[tp_DeleteTransactionId] = 0x ) AND (t14.tp_ListId = @L14) AND (UserData.tp_ListId = @L3) LEFT OUTER LOOP JOIN AllUserData AS t15 WITH(NOLOCK,INDEX=AllUserData_PK) ON (UserData.[tp_Editor]=t15.[tp_ID]) AND (UserData.[tp_RowOrdinal] = 0) AND (t15.[tp_RowOrdinal] = 0) AND ( (t15.tp_Level = 1) ) AND (t15.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (t15.[tp_CalculatedVersion] = 0 ) AND (t15.[tp_DeleteTransactionId] = 0x ) AND (t15.tp_ListId = @L14) AND (UserData.tp_ListId = @L3) WHERE (UserData.[tp_CalculatedVersion] = 0 ) AND (UserData.[tp_IsCurrentVersion] = CONVERT(bit,1) ) AND (UserData.[tp_DeleteTransactionId] = 0x ) AND (UserData.tp_ListID=@LISTID) AND ( (UserData.tp_Level = 1) ) AND (UserData.tp_SiteId=@SITEID) AND (UserData.tp_RowOrdinal=0) AND (t1.SiteId=@SITEID AND (t1.DirName=@DN OR t1.DirName LIKE @DNEL+N'/%') AND t1.SortBehavior=0) ORDER BY UserData.[tp_ID] ASC OPTION (FORCE ORDER, MAXDOP 1
Any ideas what is causing this? Any background process or the custom code.
Thanks
Akshay

This looks like a standard List query (could be any list).
Make sure your List View Threshold is 5000 or less (this is set on the Web Application, primarily). Lists that are queried for >5000 rows will introduce a table locking read.
Make sure your SQL Server is set to a Max Degree of Parallelism of 1, as well.
Trevor Seward
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

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