统计数据库空间的使用情况

Tianjon 2021-08-14 原文

公司数据库服务器的空间越来越紧张、最大的数据库达到400个G,100G 以上的库就有四五个。当然我们应该感到欣慰，数据高速增长说明我们的业务发展较好，但不可否认，我们的应用设计也存在着某些问题。诸如：滥建索引、过度冗余或者是系统在设计时没有考虑对超过价值期的历史数据进行清理。

下面这个脚本用来获取数据库每张表/索引的空间使用情况。

Code

with  pa as
(
SELECT p.object_id,p.index_id,a.type_desc as pagetype_desc,a.total_pages,a.used_pages,a.data_pages
FROM sys.partitions p JOIN sys.allocation_units a
   ON p.partition_id = a.container_id
),
indexes as
(
    select object_id,index_id,object_name(object_id) as tbname , name as indexname,type_desc as tbtype_desc
    from sys.indexes
    where object_id > =100
),
result as
(
select i.*,p.pagetype_desc,p.total_pages,p.used_pages,p.data_pages
from pa p inner join indexes i
on p.object_id=i.object_id and p.index_id=i.index_id
)

select * from result order by total_pages desc

下面这个脚本用以统计索引的使用率

Code
declare @dbid int
select @dbid = db_id()
select objectname=object_name(s.object_id), s.object_id, indexname=i.name, i.index_id
, user_seeks, user_scans, user_lookups, user_updates
from sys.dm_db_index_usage_stats s,
sys.indexes i
where database_id = @dbid and objectproperty(s.object_id,\’IsUserTable\’) = 1
and i.object_id = s.object_id
and i.index_id = s.index_id
order by (user_seeks + user_scans + user_lookups + user_updates) asc