索引维护存储过程(作业调用)

/*===================================   
--author:  fan     
--Date:   2008-08-08     
--Description: 定期对表的索引进行重建操作 
--注意：要观察索引的情况，对于不经常用的索引可以删除。 
--注意：小表字段可以不用创建索引。 
===========================================*/   
CREATE PROCEDURE [dbo].[Y_RebuildIndex]
AS     
BEGIN  
 DECLARE @t TABLE(id INT IDENTITY(1,1),TableName VARCHAR(200),IndexName VARCHAR(500),rate INT,[type] INT);
 DECLARE @i INT,@n INT;
 DECLARE @TableName VARCHAR(200),@IndexName VARCHAR(500),@rate INT;
 DECLARE @sql VARCHAR(MAX),@type INT;

 INSERT INTO @t(TableName,IndexName,rate,[type])
 -- 查看当前库所有表的索引碎片情况
 SELECT 
  object_name(a.[object_id]) AS [TableName]
  ,NAME AS [IndexName]
  ,avg_fragmentation_in_percent AS rate
  ,[type]
 FROM sys.dm_db_index_physical_stats
  (
   DB_ID() -- 当前数据库
   , NULL
   , NULL, NULL, NULL
  ) AS a
 JOIN sys.indexes AS b
 ON a.[object_id] = b.[object_id] AND a.index_id = b.index_id
 AND NAME > '' AND avg_fragmentation_in_percent > 10 /*排除非常低的碎片级别*/ 
 ORDER BY [Type];/*先创建聚集索引再创建非聚集索引*/

 SET @i = 1;
 SELECT @n = COUNT(1) FROM @t;
 WHILE (@i <= @n)
 BEGIN
  SET @TableName = '';
  SET @IndexName = '';
  SET @sql = '';
  SET @type = 0;
  SET @rate = 0;
  SELECT @TableName = TableName,@IndexName = IndexName,@type = [type],@rate = rate FROM @t WHERE id = @i;
  
  IF @TableName > '' AND @IndexName > ''
  BEGIN
   -- 聚积索引或碎片率低于30，则采用索引组织方式进行维护
   IF @type = 1 OR @rate < 30
   BEGIN
    SET @sql = 'ALTER INDEX ' +  @IndexName + ' ON ' + @TableName + '  REORGANIZE;';
   END
   -- 非聚积索引并且碎片率超过30，才使用重建索引方式
   ELSE
   BEGIN
    SET @sql = 'ALTER INDEX ' +  @IndexName + ' ON ' + @TableName + '  REBUILD;';
    /*重新生成索引 除非采用ALTER INDEX REBUILD WITH (ONLINE = ON) 联机方式才不锁表*/
    /* 无法重新组织表 "%3!" 的索引 "%1!" (分区 %2!)，因为已禁用页级锁定。
        SET @sql = ' 
      ALTER INDEX ' +  @index_name + ' ON [' + @table_name + '] SET (ALLOW_PAGE_LOCKS = ON); 
      ALTER INDEX ' +  @index_name + ' ON [' + @table_name + '] REORGANIZE;';              
    */
   END
   
   EXEC (@sql);
  END 
  
  SET @i = @i + 1;
 END
END