added files from swmgmt03

Query buffer descriptors to determine objects causing latch contention.sql

@@ -0,0 +1,78 @@
+IF EXISTS (SELECT *
+           FROM tempdb.sys.objects
+           WHERE [name] LIKE '#WaitResources%')
+    DROP TABLE #WaitResources;
+
+CREATE TABLE #WaitResources
+(
+    session_id INT,
+    wait_type NVARCHAR (1000),
+    wait_duration_ms INT,
+    resource_description sysname NULL,
+    db_name NVARCHAR (1000),
+    schema_name NVARCHAR (1000),
+    object_name NVARCHAR (1000),
+    index_name NVARCHAR (1000)
+);
+GO
+
+DECLARE @WaitDelay AS VARCHAR (16), @Counter AS INT, @MaxCount AS INT, @Counter2 AS INT;
+SELECT @Counter = 0, @MaxCount = 600, @WaitDelay = '00:00:00.100'; -- 600x.1=60 seconds
+
+SET NOCOUNT ON;
+
+WHILE @Counter < @MaxCount
+BEGIN
+   INSERT INTO #WaitResources (session_id, wait_type, wait_duration_ms, resource_description)--, db_name, schema_name, object_name, index_name)
+   SELECT wt.session_id,
+         wt.wait_type,
+         wt.wait_duration_ms,
+         wt.resource_description
+   FROM sys.dm_os_waiting_tasks AS wt
+   WHERE wt.wait_type LIKE 'PAGELATCH%'
+         AND wt.session_id <> @@SPID;
+
+   -- SELECT * FROM sys.dm_os_buffer_descriptors;
+
+   SET @Counter = @Counter + 1;
+   WAITFOR DELAY @WaitDelay;
+END
+
+--SELECT * FROM #WaitResources;
+
+UPDATE #WaitResources
+    SET db_name = DB_NAME(bd.database_id),
+        schema_name = s.name,
+        object_name = o.name,
+        index_name = i.name
+FROM #WaitResources AS wt
+     INNER JOIN sys.dm_os_buffer_descriptors AS bd
+         ON bd.database_id = SUBSTRING(wt.resource_description, 0, CHARINDEX(':', wt.resource_description))
+        AND bd.file_id = SUBSTRING(wt.resource_description, CHARINDEX(':', wt.resource_description) + 1, CHARINDEX(':', wt.resource_description, CHARINDEX(':', wt.resource_description) + 1) - CHARINDEX(':', wt.resource_description) - 1)
+        AND bd.page_id = SUBSTRING(wt.resource_description, CHARINDEX(':', wt.resource_description, CHARINDEX(':', wt.resource_description) + 1) + 1, LEN(wt.resource_description) + 1)
+        -- AND wt.file_index > 0 AND wt.page_index > 0
+     INNER JOIN sys.allocation_units AS au
+         ON bd.allocation_unit_id = AU.allocation_unit_id
+     INNER JOIN sys.partitions AS p
+         ON au.container_id = p.partition_id
+     INNER JOIN sys.indexes AS i
+         ON p.index_id = i.index_id
+        AND p.object_id = i.object_id
+     INNER JOIN sys.objects AS o
+         ON i.object_id = o.object_id
+     INNER JOIN sys.schemas AS s
+         ON o.schema_id = s.schema_id;
+
+SELECT * FROM #WaitResources
+ORDER BY wait_duration_ms DESC;
+GO
+/*
+--Other views of the same information
+SELECT wait_type, db_name, schema_name, object_name, index_name, SUM(wait_duration_ms) [total_wait_duration_ms] FROM #WaitResources
+GROUP BY wait_type, db_name, schema_name, object_name, index_name;
+SELECT session_id, wait_type, db_name, schema_name, object_name, index_name, SUM(wait_duration_ms) [total_wait_duration_ms] FROM #WaitResources
+GROUP BY session_id, wait_type, db_name, schema_name, object_name, index_name;
+*/
+
+--SELECT * FROM #WaitResources
+--DROP TABLE #WaitResources;