Create WsusDBMaintenance.sql

Tools/Invoke-WSUSMaint/WsusDBMaintenance.sql

@@ -0,0 +1,128 @@
+/******************************************************************************
+This sample T-SQL script performs basic maintenance tasks on SUSDB
+1. Identifies indexes that are fragmented and defragments them. For certain
+   tables, a fill-factor is set in order to improve insert performance.
+   Based on MSDN sample at http://msdn2.microsoft.com/en-us/library/ms188917.aspx
+   and tailored for SUSDB requirements
+2. Updates potentially out-of-date table statistics.
+******************************************************************************/
+
+USE SUSDB;
+GO
+SET NOCOUNT ON;
+SET QUOTED_IDENTIFIER ON;
+
+-- Rebuild or reorganize indexes based on their fragmentation levels
+DECLARE @work_to_do TABLE (
+    objectid int
+    , indexid int
+    , pagedensity float
+    , fragmentation float
+    , numrows int
+)
+
+DECLARE @objectid int;
+DECLARE @indexid int;
+DECLARE @schemaname nvarchar(130); 
+DECLARE @objectname nvarchar(130); 
+DECLARE @indexname nvarchar(130); 
+DECLARE @numrows int
+DECLARE @density float;
+DECLARE @fragmentation float;
+DECLARE @command nvarchar(4000); 
+DECLARE @fillfactorset bit
+DECLARE @numpages int
+
+-- Select indexes that need to be defragmented based on the following
+-- * Page density is low
+-- * External fragmentation is high in relation to index size
+PRINT 'Estimating fragmentation: Begin. ' + convert(nvarchar, getdate(), 121) 
+INSERT @work_to_do
+SELECT
+    f.object_id
+    , index_id
+    , avg_page_space_used_in_percent
+    , avg_fragmentation_in_percent
+    , record_count
+FROM 
+    sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'SAMPLED') AS f
+WHERE
+    (f.avg_page_space_used_in_percent < 85.0 and f.avg_page_space_used_in_percent/100.0 * page_count < page_count - 1)
+    or (f.page_count > 50 and f.avg_fragmentation_in_percent > 15.0)
+    or (f.page_count > 10 and f.avg_fragmentation_in_percent > 80.0)
+
+PRINT 'Number of indexes to rebuild: ' + cast(@@ROWCOUNT as nvarchar(20))
+
+PRINT 'Estimating fragmentation: End. ' + convert(nvarchar, getdate(), 121)
+
+SELECT @numpages = sum(ps.used_page_count)
+FROM
+    @work_to_do AS fi
+    INNER JOIN sys.indexes AS i ON fi.objectid = i.object_id and fi.indexid = i.index_id
+    INNER JOIN sys.dm_db_partition_stats AS ps on i.object_id = ps.object_id and i.index_id = ps.index_id
+
+-- Declare the cursor for the list of indexes to be processed.
+DECLARE curIndexes CURSOR FOR SELECT * FROM @work_to_do
+
+-- Open the cursor.
+OPEN curIndexes
+
+-- Loop through the indexes
+WHILE (1=1)
+BEGIN
+    FETCH NEXT FROM curIndexes
+    INTO @objectid, @indexid, @density, @fragmentation, @numrows;
+    IF @@FETCH_STATUS < 0 BREAK;
+
+    SELECT 
+        @objectname = QUOTENAME(o.name)
+        , @schemaname = QUOTENAME(s.name)
+    FROM 
+        sys.objects AS o
+        INNER JOIN sys.schemas as s ON s.schema_id = o.schema_id
+    WHERE 
+        o.object_id = @objectid;
+
+    SELECT 
+        @indexname = QUOTENAME(name)
+        , @fillfactorset = CASE fill_factor WHEN 0 THEN 0 ELSE 1 END
+    FROM 
+        sys.indexes
+    WHERE
+        object_id = @objectid AND index_id = @indexid;
+
+    IF ((@density BETWEEN 75.0 AND 85.0) AND @fillfactorset = 1) OR (@fragmentation < 30.0)
+        SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REORGANIZE';
+    ELSE IF @numrows >= 5000 AND @fillfactorset = 0
+        SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD WITH (FILLFACTOR = 90)';
+    ELSE
+        SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD';
+    PRINT convert(nvarchar, getdate(), 121) + N' Executing: ' + @command;
+    EXEC (@command);
+    PRINT convert(nvarchar, getdate(), 121) + N' Done.';
+END
+
+-- Close and deallocate the cursor.
+CLOSE curIndexes;
+DEALLOCATE curIndexes;
+
+
+IF EXISTS (SELECT * FROM @work_to_do)
+BEGIN
+    PRINT 'Estimated number of pages in fragmented indexes: ' + cast(@numpages as nvarchar(20))
+    SELECT @numpages = @numpages - sum(ps.used_page_count)
+    FROM
+        @work_to_do AS fi
+        INNER JOIN sys.indexes AS i ON fi.objectid = i.object_id and fi.indexid = i.index_id
+        INNER JOIN sys.dm_db_partition_stats AS ps on i.object_id = ps.object_id and i.index_id = ps.index_id
+
+    PRINT 'Estimated number of pages freed: ' + cast(@numpages as nvarchar(20))
+END
+GO
+
+
+--Update all statistics
+PRINT 'Updating all statistics.' + convert(nvarchar, getdate(), 121) 
+EXEC sp_updatestats
+PRINT 'Done updating statistics.' + convert(nvarchar, getdate(), 121) 
+GO