SET NOCOUNT ON;DECLARE @objectid int;DECLARE @indexid int;DECLARE @partitioncount bigint;DECLARE @schemaname nvarchar(258);DECLARE @objectname nvarchar(258);DECLARE @indexname nvarchar(258);DECLARE @partitionnum bigint;DECLARE @partitions bigint;DECLARE @frag float;DECLARE @command varchar(8000);-- ensure the temporary table does not existIF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do')DROP TABLE work_to_do;-- conditionally select from the function, converting object and index IDs to names.-- 将符合所设条件的IndexID选出来，并将名称转换为友好名称SELECTobject_id AS objectid,    index_id AS indexid,    partition_number AS partitionnum,    avg_fragmentation_in_percent AS fragINTO work_to_doFROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'LIMITED')-- *****************************-- 此参数设定很重要 avg_fragmentation_in_percent > 10.0-- *****************************WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;-- Declare the cursor for the list of partitions to be processed.-- 声明打开分区列表的游标DECLARE partitions CURSOR FOR SELECT * FROM work_to_do;

-- Open the cursor.-- 打开游标OPEN partitions;

-- Loop through the partitions.-- 循环遍历分区FETCH NEXTFROM partitionsINTO @objectid, @indexid, @partitionnum, @frag;

WHILE @@FETCH_STATUS = 0BEGIN;SELECT @objectname = QUOTENAME(o.name),@schemaname = QUOTENAME(s.name)FROM sys.objects AS oJOIN sys.schemas as s ON s.schema_id = o.schema_idWHERE o.object_id = @objectid;SELECT @indexname = QUOTENAME(name)FROM sys.indexesWHERE object_id = @objectid AND index_id = @indexid;SELECT @partitioncount = count (*)FROM sys.partitionsWHERE object_id = @objectid AND index_id = @indexid;-- 30 is an arbitrary decision point at which to switch-- between reorganizing and rebuilding-- 设定重新生成和重新组织的边界条件  -- *****************************-- 此参数设定很重要-- *****************************IF @frag < 5.0BEGIN;SELECT @command = 'ALTER INDEX ' + @indexname + ' ON '+ @schemaname + '.' + @objectname + ' REORGANIZE';IF @partitioncount > 1SELECT @command = @command + ' PARTITION='+ CONVERT (CHAR, @partitionnum);EXEC (@command);END;

IF @frag >= 5.0BEGIN;SELECT @command = 'ALTER INDEX ' + @indexname +' ON ' + @schemaname+ '.' + @objectname + ' REBUILD';IF @partitioncount > 1SELECT @command = @command + ' PARTITION='+ CONVERT (CHAR, @partitionnum);EXEC (@command);END;PRINT 'Executed ' + @command;

FETCH NEXT FROM partitions INTO @objectid, @indexid, @partitionnum, @frag;END;-- Close and deallocate the cursor.-- 关闭释放游标CLOSE partitions;DEALLOCATE partitions;

-- drop the temporary table-- 删除临时表IF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do')DROP TABLE work_to_do;GO