USE [master]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE proc [dbo].[sp_rebuild_index] 
(
  @Rebuild_Fragmentation_Percent smallint = 5  -- 當邏輯碎片百分比 > 5% 重新生成索引
)
as
begin
  /* 調用方法：
  1.針對當前實例所有數據庫：  exec sys.sp_MSforeachdb 'use ?;exec sp_rebuild_index'
  2.針對當前數據庫：      exec sp_rebuild_index
  */
  
  --對系統數據庫不作重新組織索引和重新生成索引
  if (db_name() in ('master','model','msdb','tempdb')) return;  
  
  --如果邏輯碎片（索引中的無序頁）的百分比 = 5% ，就不作重新組織索引和重新生成索引
  if not exists(select 1 from sys.dm_db_index_physical_stats(db_id(),null,null,null,null) a where a.index_id>0 and a.avg_fragmentation_in_percent > @Rebuild_Fragmentation_Percent) return
  
  
  print replicate('-',60)+char(13)+char(10)+replicate(' ',14)+N'對數據庫 '+quotename(db_name())+N' 進行索引優化'+replicate(' ',20)+char(13)+char(10)  
    
  declare @sql nvarchar(2000),@str nvarchar(2000)
  
  declare cur_x cursor for 
    select 'alter index '+quotename(a.name)+' on '+quotename(object_schema_name(a.object_id))+'.'+quotename(object_name(a.object_id))+' rebuild;' as [sql]
        ,N'重新生成索引：' +quotename(object_schema_name(a.object_id))+'.'+quotename(object_name(a.object_id))+'.'+quotename(a.name) as [str]
      from sys.indexes a
        inner join sys.dm_db_index_physical_stats(db_id(),null,null,null,null) b on b.object_id=a.object_id
          and b.index_id=a.index_id  
      where a.index_id>0  
        and b.avg_fragmentation_in_percent > @Rebuild_Fragmentation_Percent
      order by object_name(a.object_id),a.index_id
      
  open cur_x
  fetch next from cur_x into @sql,@str  
  
  while (@@fetch_status = 0)
  begin
 print @sql
    exec(@sql)
 
    print @str
    fetch next from cur_x into @sql,@str  
      
  end
  close cur_x
  deallocate cur_x 
    
end