索引使用率

-------------索引使用率
select distinct db_name(database_id) as N'数据库名称',  
       object_name(a.object_id) as N'表名',  
       b.name N'索引名称',  
       user_seeks N'用户索引查找次数',  
       user_scans N'用户索引扫描次数',  
       last_user_seek N'最后查找时间',  
       last_user_scan N'最后扫描时间',  
       rows as N'表中的行数'  
from sys.dm_db_index_usage_stats a join   
     sys.indexes b  
     on a.index_id = b.index_id  
     and a.object_id = b.object_id  
     join sysindexes c  
     on c.id = b.object_id  
where database_id=db_id('DBNAME')   ---改成要查看的数据库  
and object_name(a.object_id) not like 'sys%'  
order by user_seeks,user_scans,object_name(a.object_id)-----判断是否需要更新索引统计信息