Re-index the WSUS Database

README.md

The performance of large Windows Server Update Services (WSUS) deployments will degrade over time if the WSUS database is not maintained properly. The WSUSDBMaintenance script is a T-SQL script that can be run by SQL Server administrators to re-index and defragment WSUS databases. It should not be used on WSUS 2.0 databases.This script contributed by the Microsoft WSUS team.

If you are using Windows Internal Database, you will need to use the sqlcmd utility, which can be downloaded from docs.microsoft.com page for SQLCMD. This page will also contain additional information about the sqlcmd utility.

To use this script with Windows Internal Database, you should run the following command:

sqlcmd -S np:\\.\pipe\MICROSOFT##WID\tsql\query -i <script-location>\WSUSDBMaintenance.sql

The call to sqlcmd needs to have a -I (capital i) parameter, which tells SQL to run the script with QUOTED_IDENTIFIERS enabled.

Originaly stored at: https://gallery.technet.microsoft.com/scriptcenter/6f8cde49-5c52-4abd-9820-f1d270ddea61#content

WsusDBMaintenance.sql

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 Updates potentially out-of-date table statistics.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

Regarding the above error in mapwiz's comment - if you do not wish to manually correct the indexes you can modify the script like this to skip over them:

On line 100, replace the following:

    EXEC (@command);  

With:

    BEGIN TRY
        EXEC (@command); 
    END TRY
    BEGIN CATCH
        SELECT ERROR_MESSAGE() AS ErrorMessage;
    END CATCH

Can you explain how you manually rebuilt the index? I'm not very familiar with SQL. I am able to run the Query in SSMS, but in my scheduled task, it throws the error like mapwiz.

Line with error:
ALTER INDEX [nc_LocalUpdateID] ON [dbo].[ivwApiUpdateRevision] REBUILD WITH (FILLFACTOR = 90)