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查找未使用的非聚集索引和未使用的表. DMV:sys.dm_db_index_usage_stats
The counters are initialized to empty whenever the SQL Server (MSSQLSERVER) service is started. In addition,whenever a database is detached or is shut down (for example,because AUTO_CLOSE is set to ON),all rows associated with the database are removed.
--查找未使用的非聚集索引(排除聚集索引和堆表)
--This returns all the noclustered indexes that have not been used for any requests by users
--or the system from the time SQL Server is started.
-- nzperfect
select tablename,indexname,'drop index '+tablename+'.'+indexname as dropIndexCommand
from
(
select object_name(i.object_id) as tablename,i.name as indexname
from sys.indexes i
left outer join sys.dm_db_index_usage_stats s
on s.object_id = i.object_id and s.index_id = i.index_id
and s.database_id = db_id()
where objectproperty(i.object_id,'IsUserTable') = 1
and objectproperty(i.object_id,'IsMSShipped')=0
and i.index_id > 1 -- 0 indicates the heap 1 indicates the clustered index
and i.is_primary_key = 0 -- 1 indicates the primary key
and s.object_id is null
union all
select object_name(i.object_id) as tablename,i.name as indexname
from sys.indexes i
inner join sys.dm_db_index_usage_stats s
on s.object_id = i.object_id and s.index_id = i.index_id
and s.database_id = db_id()
where objectproperty(i.object_id,'IsMSShipped')=0
and i.index_id > 1 -- 0 indicates the heap 1 indicates the clustered index
and i.is_primary_key = 0 -- 1 indicates the primary key
and (s.user_seeks + s.user_scans + s.user_lookups)=0
)a
--查找未使用的表
--This returns all the table that have not been used for any requests by users
--or the system from the time SQL Server is started.
--nzperfect
select object_name(i.object_id) as tablename,i.name as clusteredindexname,
case when i.index_id=0 then 'Heap Table'
when i.index_id=1 then 'Clustered Table' end as TableType
from sys.indexes i
left outer join sys.dm_db_index_usage_stats s
on s.object_id = i.object_id and s.index_id = i.index_id
and s.database_id = db_id()
where objectproperty(i.object_id,'IsMSShipped')=0
and i.index_id in (0,1) -- 0 indicates the heap 1 indicates the clustered index
and s.object_id is null （编辑：李大同）
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