判断是否走索引
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)
效果
left join导致select count() from ...慢,不走索引,改为inner join 就好了