Hallo
Alle indexen in de SQL Server-database zullen worden gefragmenteerd. Nadat gerelateerde tabellen veel zijn bijgewerkt, verwijdert u transacties.
SQL Server Rebuild Index
Als de index in de tabel gefragmenteerd is, zullen alle transacties met betrekking tot die tabel erg traag zijn. Dus SQL Server DBA moet regelmatig indexen controleren en welke indexen gefragmenteerd zijn en welke niet.
SQL Server Index reorganiseren
U kunt gefragmenteerde index gebruiken met de volgende procedure. Deze procedure voor het opnieuw opbouwen en reorganiseren van de index hangt af van de situatie
CREATE PROC [INDEX_MAINTENANCE] @DBName VARCHAR(100) AS BEGIN SET NOCOUNT ON; DECLARE @OBJECT_ID INT, @INDEX_NAME sysname, @SCHEMA_NAME sysname, @OBJECT_NAME sysname, @AVG_FRAG float, @command varchar(8000), @RebuildCount int, @ReOrganizeCount int CREATE TABLE #tempIM ( [ID] [INT] IDENTITY(1,1) NOT NULL PRIMARY KEY, [INDEX_NAME] sysname NULL, [OBJECT_ID] INT NULL, [SCHEMA_NAME] sysname NULL, [OBJECT_NAME] sysname NULL, [AVG_FRAG] float ) SELECT @RebuildCount=0,@ReOrganizeCount=0 --Get Fragentation values SELECT @command= 'Use ' + @DBName + '; INSERT INTO #tempIM (OBJECT_ID, INDEX_NAME, SCHEMA_NAME, OBJECT_NAME, AVG_FRAG) SELECT ps.object_id, i.name as IndexName, OBJECT_SCHEMA_NAME(ps.object_id) as ObjectSchemaName, OBJECT_NAME (ps.object_id) as ObjectName, ps.avg_fragmentation_in_percent FROM sys.dm_db_index_physical_stats (NULL, NULL, NULL , NULL, ''LIMITED'') ps INNER JOIN sys.indexes i ON i.object_id=ps.object_id and i.index_id=ps.index_id WHERE avg_fragmentation_in_percent > 5 AND ps.index_id > 0 and ps.database_id=DB_ID('''[email protected]+''') ORDER BY avg_fragmentation_in_percent desc ' exec(@command) DECLARE c CURSOR FAST_FORWARD FOR SELECT OBJECT_ID,INDEX_NAME, SCHEMA_NAME, OBJECT_NAME, AVG_FRAG FROM #tempIM OPEN c FETCH NEXT FROM c INTO @OBJECT_ID, @INDEX_NAME, @SCHEMA_NAME, @OBJECT_NAME, @AVG_FRAG WHILE @@FETCH_STATUS = 0 BEGIN --Reorganize or Rebuild IF @AVG_FRAG>30 BEGIN SELECT @command = 'Use ' + @DBName + '; ALTER INDEX [' + @INDEX_NAME +'] ON [' + @SCHEMA_NAME + '].[' + @OBJECT_NAME + '] REBUILD WITH (ONLINE = ON )'; SET @RebuildCount = @RebuildCount+1 END ELSE BEGIN SELECT @command = 'Use ' + @DBName + '; ALTER INDEX [' + @INDEX_NAME +'] ON [' + @SCHEMA_NAME + '].[' + @OBJECT_NAME + '] REORGANIZE '; SET @ReOrganizeCount = @ReOrganizeCount+1 END BEGIN TRY EXEC (@command); END TRY BEGIN CATCH END CATCH FETCH NEXT FROM c INTO @OBJECT_ID, @INDEX_NAME, @SCHEMA_NAME, @OBJECT_NAME, @AVG_FRAG END CLOSE c DEALLOCATE c DROP TABLE #tempIM SELECT cast(@RebuildCount as varchar(5))+' index Rebuild,'+cast(@ReOrganizeCount as varchar(5))+' index Reorganize is done.' as Result END
U kunt deze procedure uitvoeren met de volgende query. Typ de databasenaam correct in plaats van DEVECI, en de procedure zal de gerelateerde database-indexen opnieuw opbouwen en reorganiseren.
exec dbo.INDEX_MAINTENANCE 'DEVECI';