SQL Server索引重建和重新组织脚本

　　为了有针对性的重建索引，提高数据库的效能，同时避免因全部重建造成服务器的Loading，我们内部有开发一个存储过程脚本，逻辑大概如下：

    　首先遍历该实例中所有数据库中所有table中的index,并将Fragment保存到临时表中，这当中用到了一个系统存储过程：sp_MSforeachdb 可以实现对所有数据库的循环遍历；然后对临时表中的数据进行处理，如果

碎片介于20%--40%，则对索引进行重新组织，大于40%则进行重建。

USE [msdb]
GO
/****** Object:  StoredProcedure [dbo].[IndexMaintain]    Script Date: 09/14/2012 17:59:33 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
 -- =============================================
-- Author
-- Create date:  2012/01/17
-- Description:    IndexMaintain
-- ==============================================
ALTER  procedure  [dbo].[IndexMaintain]  
as   
SET NOCOUNT on 
 
BEGIN TRY 
    declare @EXCEPTION VARCHAR(MAX)
    declare @MailSubject NVARCHAR(255)
    declare @DBName NVARCHAR(255)
    declare @TableName NVARCHAR(255)
    declare @SchemaName NVARCHAR(255)
    declare @IndexName NVARCHAR(255)
    declare @avg_fragmentation_in_percent_old DECIMAL(18,3)
    declare @avg_page_space_used_in_percent_old DECIMAL(18,3)
    declare @avg_fragmentation_in_percent_new DECIMAL(18,3)
    declare @avg_page_space_used_in_percent_new DECIMAL(18,3)
            
    declare @Defrag NVARCHAR(max)
    declare @Sql NVARCHAR(max)
    declare @ParmDefinition nvarchar(500)
    set @EXCEPTION=''
    
    --删除#Frag
    if exists(select *  from sys.objects where object_id=object_id(N'#Frag'))
    drop table #Frag 
       
    --定义临时表#Frag保存index Fragment    
    create table #Frag(
                 DBname  NVARCHAR(255),
                 TableName NVARCHAR(255),
                 SchemaName NVARCHAR(255),
                 IndexName NVARCHAR(255),
                 AvgFragment DECIMAL(18,3),
                 avg_page_space_used DECIMAL(18,3)
                 )
                 
    --遍历DB中所有table上的index,并将Fragment保存到临时表#Frag中.
    exec sp_MSforeachdb @command1= 'insert into #Frag(DBname, TableName,SchemaName,IndexName,AvgFragment,avg_page_space_used)
                                    select ''[?]'' AS DBName, t.Name AS TableName, sc.Name AS SchemaName, i.name AS IndexName, s.avg_fragmentation_in_percent, s.avg_page_space_used_in_percent  
                                    from [?].sys.dm_db_index_physical_stats(DB_ID(''?''),NULL,NULL,NULL,''Sampled'') AS s
                                    join [?].sys.indexes i on s.Object_Id=i.Object_id and s.Index_id=i.Index_id
                                    join [?].sys.tables t on i.Object_id=t.Object_ID 
                                    join [?].sys.schemas sc on t.schema_id=sc.SCHEMA_ID
                                    where s.avg_fragmentation_in_percent  >20 and t.type=''U'' and s.page_count>8 and i.allow_page_locks=1 and i.allow_row_locks=1 
                                    order by  TableName,IndexName '

    --定义CURSOR遍历临时表#Frag,根据Fragment大小采取不同的方案维护index.
    declare cList CURSOR for
            select *  from #Frag 
    open cList 
    fetch next from cList into @DBName,@TableName,@SchemaName,@IndexName,@avg_fragmentation_in_percent_old,@avg_page_space_used_in_percent_old
    while @@FETCH_STATUS=0
    begin 
       set @TableName ='['+ @TableName +']'
       --Fragment between 20.0 and 40.0 ,使用 Alter INDEX reorganize整理碎片
       if @avg_fragmentation_in_percent_old between 20.0 and 40.0 AND @DBName <>'[TOPCOA]' 
       begin          
         --整理碎片
         set @Defrag=N'Alter INDEX   '+''+@IndexName+' on '+@DBName+'.'+@SchemaName+'.'+@TableName+' reorganize'
         exec sp_executesql @Defrag
                  
         --获取index被整理后的碎片比例
         set @Sql=N'USE '+@DBName+'; select @avg_fragmentation_in_percent_new_temp=s.avg_fragmentation_in_percent,@avg_page_space_used_in_percent_new_temp= s.avg_page_space_used_in_percent 
                    from  '+@DBName+'.sys.indexes i  
                    inner join '+@DBName+'.sys.dm_db_index_physical_stats(db_id(replace(replace('''+@DBName+''',''['',''''),'']'','''')), object_id('''+@TableName+''''+'),null,null,''sampled'') as s on   i.index_id=s.index_id  
                    where i.object_id=object_id('''+@TableName+''''+')and i.name='''+@IndexName+''''
         set @ParmDefinition=N'@avg_fragmentation_in_percent_new_temp  DECIMAL(18,3) output,@avg_page_space_used_in_percent_new_temp DECIMAL(18,3) output'
         exec sp_executesql @Sql,@ParmDefinition ,@avg_fragmentation_in_percent_new_temp=@avg_fragmentation_in_percent_new output, @avg_page_space_used_in_percent_new_temp=@avg_page_space_used_in_percent_new output
         
         --write log
         insert [dbo].IndexDefrag values(@DBName,@TableName,@SchemaName,@IndexName,getdate(),@avg_fragmentation_in_percent_old,@avg_page_space_used_in_percent_old,@avg_fragmentation_in_percent_new,@avg_page_space_used_in_percent_new,'0')
       end 
        --Fragment大于40.0 ,使用 Alter INDEX rebuild整理碎片
       else if @avg_fragmentation_in_percent_old >40.0 AND @DBName <>'[TOPCOA]'
       begin          
         --整理碎片 
         set @Defrag=N'Alter INDEX    '+''+@IndexName+' on '+@DBName+'.'+@SchemaName+'.'+@TableName+' rebuild'
         exec sp_executesql @Defrag 
         
         --获取index被整理后的碎片比例
         set @Sql=N'USE '+@DBName+';select @avg_fragmentation_in_percent_new_temp=s.avg_fragmentation_in_percent,@avg_page_space_used_in_percent_new_temp= s.avg_page_space_used_in_percent 
                    from  '+@DBName+'.sys.indexes i  
                    inner join '+@DBName+'.sys.dm_db_index_physical_stats(db_id(replace(replace('''+@DBName+''',''['',''''),'']'','''')), object_id('''+@TableName+''''+'),null,null,''sampled'') as s on   i.index_id=s.index_id  
                    where i.object_id=object_id('''+@TableName+''''+')and i.name='''+@IndexName+''''
         set @ParmDefinition=N'@avg_fragmentation_in_percent_new_temp  DECIMAL(18,3) output,@avg_page_space_used_in_percent_new_temp DECIMAL(18,3) output'
         exec sp_executesql @Sql,@ParmDefinition ,@avg_fragmentation_in_percent_new_temp=@avg_fragmentation_in_percent_new output, @avg_page_space_used_in_percent_new_temp=@avg_page_space_used_in_percent_new output
         
         --write log
         insert [dbo].IndexDefrag values(@DBName,@TableName,@SchemaName,@IndexName,getdate(),@avg_fragmentation_in_percent_old,@avg_page_space_used_in_percent_old,@avg_fragmentation_in_percent_new,@avg_page_space_used_in_percent_new,'1')
        end 
      fetch next from cList into @DBName,@TableName,@SchemaName,@IndexName,@avg_fragmentation_in_percent_old,@avg_page_space_used_in_percent_old
    end 
    close cList 
    deallocate cList 
END TRY
BEGIN CATCH
    SET @EXCEPTION = ERROR_MESSAGE() 
END CATCH

IF @EXCEPTION<>''
BEGIN 
    SET @MailSubject='[Important]DB Index Maintainence failed from ' + @@SERVERNAME  
    EXEC msdb.dbo.sp_send_dbmail
    @profile_name = 'mail',                     
    @recipients = '[e-mail]',
    @body = @EXCEPTION, 
    @subject = @MailSubject 
    
END