SCCM 2007: WSUS DB maintenance

For a while now the synchronization of updates which are initiated by SCCM via WSUS are terribly slow. It takes hours and hours after SCCM is ready to deploy new updates to the clients caused by a WSUS databases of which the last maintenance job was run probably after the installation a few years ago.

First thing to do is removing the superseeded updates from the database.

Open the WSUS console and expand Updates > All Updates.

Right-click the column headers and select Supercedence.




After the colom is visible click twice on the column title to sort the updates by supersedence and select all updates that apply. After the selection had made, right-click and select Decline.

In the WSUS administration console, select Options, and then Server Cleanup Wizard. In the next window you can choose what you like to cleanup, well....everything you would think. Not in this case.

If you didn't run the cleanup for a long time its better to check and run the options one by one.
The cleanup can be automated with a powershell script that can be scheduled to run periodicly.

[reflection.assembly]::LoadWithPartialName("Microsoft.UpdateServices.Administration")`
| out-null
$wsus = [Microsoft.UpdateServices.Administration.AdminProxy]::GetUpdateServer();
$cleanupScope = new-object Microsoft.UpdateServices.Administration.CleanupScope;
$cleanupScope.DeclineSupersededUpdates = $true       
$cleanupScope.DeclineExpiredUpdates         = $true
$cleanupScope.CleanupObsoleteUpdates     = $true
$cleanupScope.CompressUpdates                  = $true
#$cleanupScope.CleanupObsoleteComputers = $true
$cleanupScope.CleanupUnneededContentFiles = $true
$cleanupManager = $wsus.GetCleanupManager();
$cleanupManager.PerformCleanup($cleanupScope);
 If powershell comes up with a message that execution of scripts is disabled on this system then change

Set-ExecutionPolicy Unrestricted

 

After WSUS had been cleaned up it's time to reindex the WSUS database, this can be done with the next SQL script:

 

/******************************************************************************
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 Updates potentially out-of-date table statistics.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;

-- 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

 

 This also can be automated with a scheduled task. I run both maintenance tasks once a month.