WSUS 效能不好時, 除了CLEAN 外, 也可重新INDEX WSUS DB
http://gallery.technet.microsoft.com/ScriptCenter/6f8cde49-5c52-4abd-9820-f1d270ddea61/
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 3.0 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 Feature Pack for Microsoft SQL Server 2005. For more information about the sqlcmd utility, see sqlcmd Utility.
To use this script with Windows Internal Database, you should run the following command:
sqlcmd –I -S np:\\.\pipe\MSSQL$MICROSOFT##SSEE\sql\query –i <scriptLocation>\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.
VB CODE
/******************************************************************************
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 Updates potentially out-of-date table statistics.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
留言列表
