背景:
下面是2014年3月15日的SQL PASS上大神提供的重建索引GuideLine:When To Rebuild vs. Defrag•< 10% do nothing•10% <> 30% defrag/reorganize•30%+ rebuild•And don’t do anything if the index has < 1000 pages
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根据此GuideLine,本人制作了自动重建索引的存储过程分享给大家:
SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER OFFGO-- =============================================-- Author: <AjianGG>-- Create date: <2014/03/18>-- Description: <Removing Fragmentation>-- =============================================CREATE PROCEDURE [dbo].[proc_rebuild_index] @ret INT OUTPUTASSET NOCOUNT ONBEGIN DECLARE @fldDefragFragment INT = 10; DECLARE @fldRebuildFragment INT = 30; DECLARE @fldMinPageCount INT = 1000; DECLARE @fldTable VARCHAR(256); DECLARE @fldIndex VARCHAR(256); DECLARE @fldPercent INT; DECLARE @Sql VARCHAR(256); BEGIN TRY SET @ret = -1; -- 获取索引碎片状况 DECLARE curIndex CURSOR LOCAL STATIC READ_ONLY FORWARD_ONLY FOR SELECT TBL.NAME TABLE_NAME ,IDX.NAME INDEX_NAME ,AVGP.AVG_FRAGMENTATION_IN_PERCENT FROM SYS.DM_DB_INDEX_PHYSICAL_STATS(DB_ID(), NULL,NULL, NULL, 'LIMITED') AS AVGP INNER JOIN SYS.INDEXES AS IDX ON AVGP.OBJECT_ID = IDX.OBJECT_ID AND AVGP.INDEX_ID = IDX.INDEX_ID INNER JOIN SYS.TABLES AS TBL ON AVGP.OBJECT_ID = TBL.OBJECT_ID INNER JOIN SYS.DM_DB_PARTITION_STATS PS ON AVGP.OBJECT_ID = PS.OBJECT_ID AND AVGP.INDEX_ID = PS.INDEX_ID WHERE AVGP.INDEX_ID >= 1 AND AVGP.AVG_FRAGMENTATION_IN_PERCENT >= @fldDefragFragment AND PS.RESERVED_PAGE_COUNT >= @fldMinPageCount; -- 打开游标 OPEN curIndex; -- 获取游标 FETCH NEXT FROM curIndex INTO @fldTable,@fldIndex,@fldPercent; WHILE @@FETCH_STATUS = 0 BEGIN --碎片率大于30,重建索引 IF @fldPercent >= @fldRebuildFragment BEGIN SET @Sql = 'ALTER INDEX ' + @fldIndex + ' ON ' + @fldTable + ' REBUILD'; EXEC(@Sql); END ELSE --碎片率小于30,重组索引 BEGIN SET @Sql = 'ALTER INDEX ' + @fldIndex + ' ON ' + @fldTable + ' REORGANIZE'; EXEC(@Sql); END -- 获取游标 FETCH NEXT FROM curIndex INTO @fldTable,@fldIndex,@fldPercent; END -- 关闭游标 CLOSE curIndex; DEALLOCATE curIndex; SET @ret = 0; END TRY BEGIN CATCH SET @ret = -1; DECLARE @ErrorMessage nvarchar(4000); DECLARE @ErrorSeverity int; DECLARE @ErrorState int; SELECT @ErrorMessage = ERROR_MESSAGE() , @ErrorSeverity = ERROR_SEVERITY() , @ErrorState = ERROR_STATE(); RAISERROR( @ErrorMessage , @ErrorSeverity , @ErrorState); RETURN; END CATCH;END
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