sqlserver 判断是否走索引 left join导致select count() from ...慢

use GanMeiDb8004 --要查看的数据库

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(‘GanMeiDb8004‘)   ---改成要查看的数据库
and object_name(a.object_id) not like ‘sys%‘ AND object_name(a.object_id) = ‘StockStatusChangeLog‘
order by user_seeks,user_scans,object_name(a.object_id)