SQL SERVER 2008 R2 重建索引的方法

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SQL SERVER 2008 R2 重建索引的方法
参考sys.dm_db_index_physical_stats
检查索引碎片情况
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								1.SELECT

								2.OBJECT_NAME(object_id) as objectname,

								3.object_id AS objectid,

								4.index_id AS indexid,

								5.partition_number AS partitionnum,

								6.avg_fragmentation_in_percent AS fra

								7.FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, ‘LIMITED')

								8.WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

								9. 

								10.使用脚本中的 sys.dm_db_index_physical_stats 重新生成或重新组织索引 （来源于联机帮助）

								11. 

								12.SET NOCOUNT ON;

								13.DECLARE @objectid int;

								14.DECLARE @indexid int;

								15.DECLARE @partitioncount bigint;

								16.DECLARE @schemaname nvarchar(130);

								17.DECLARE @objectname nvarchar(130);

								18.DECLARE @indexname nvarchar(130);

								19.DECLARE @partitionnum bigint;

								20.DECLARE @partitions bigint;

								21.DECLARE @frag float;

								22.DECLARE @command nvarchar(4000);

								23.– Conditionally select tables and indexes from the sys.dm_db_index_physical_stats function

								24.– and convert object and index IDs to names.

								25.SELECT

								26.object_id AS objectid,

								27.index_id AS indexid,

								28.partition_number AS partitionnum,

								29.avg_fragmentation_in_percent AS frag

								30.INTO #work_to_do

								31.FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, ‘LIMITED')

								32.WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

								33.– Declare the cursor for the list of partitions to be processed.

								34.DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;

								35.– Open the cursor.

								36.OPEN partitions;

								37.– Loop through the partitions.

								38.WHILE (1=1)

								39.BEGIN;

								40.FETCH NEXT

								41.FROM partitions

								42.INTO @objectid, @indexid, @partitionnum, @frag;

								43.IF @@FETCH_STATUS < 0 BREAK;

								44.SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)

								45.FROM sys.objects AS o

								46.JOIN sys.schemas as s ON s.schema_id = o.schema_id

								47.WHERE o.object_id = @objectid;

								48.SELECT @indexname = QUOTENAME(name)

								49.FROM sys.indexes

								50.WHERE object_id = @objectid AND index_id = @indexid;

								51.SELECT @partitioncount = count (*)

								52.FROM sys.partitions

								53.WHERE object_id = @objectid AND index_id = @indexid;

								54.– 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding.

								55.IF @frag < 30.0

								56.SET @command = N‘ALTER INDEX ‘ + @indexname + N‘ ON ‘ + @schemaname + N‘.' + @objectname + N‘ REORGANIZE';

								57.IF @frag >= 30.0

								58.SET @command = N‘ALTER INDEX ‘ + @indexname + N‘ ON ‘ + @schemaname + N‘.' + @objectname + N‘ REBUILD';

								59.IF @partitioncount > 1

								60.SET @command = @command + N‘ PARTITION=' + CAST(@partitionnum AS nvarchar(10));

								61.EXEC (@command);

								62.PRINT N‘Executed: ‘ + @command;

								63.END;

								64.– Close and deallocate the cursor.

								65.CLOSE partitions;

								66.DEALLOCATE partitions;

								67.– Drop the temporary table.

								68.DROP TABLE #work_to_do;

								69.GO
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