数据库的硬盘空间如何使用

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SQL Server占用的存储空间，包含数据库file占用的存储空间，数据库对象占用的存储空间。

一，数据库file占用的存储空间

1，使用 sys.master_files 查看数据库中各个file占用的存储空间

select db.name as database_name,    db.is_auto_shrink_on,    db.recovery_model_desc,    mf.file_id,    mf.type_desc,    mf.name as logic_file_name,    mf.size*8/1024/1024 as size_gb,    mf.physical_name,    --mf.max_size,    mf.growth,    mf.is_percent_growth,    mf.state_descfrom sys.databases db inner join sys.master_files mf     on db.database_id=mf.database_idwhere mf.size*8/1024/1024>1  -- GBorder by size_gb desc

2，使用sp_spaceused 查看当前DB的空间使用量

use DB_Studygoexec sys.sp_spaceused

database_size：database_size includes both data and log files.

数据文件的空间利用信息：

• unallocated space ：Space in the database that has not been reserved for database objects.

• reserved：Total amount of space allocated by objects in the database.

• data：Total amount of space used by data.

• index_size：Total amount of space used by indexes.

• unused ：Total amount of space reserved for objects in the database, but not yet used.

• database_size will always be larger than the sum of reserved + unallocated space because it includes the size of log files, but reserved and unallocated_space consider only data pages.

3， 按照extent统计data file的disk space usage

从系统page：GAM 和 SGAM 上读取Extent allocate 信息，计算data file有多少extent allocated 或 unallocated。

计算公式：1Extent=8Pages，1Page=8KB

dbcc showfilestats

4， 统计SQL Server 实例中所有数据库的日志文件的disk space usage

dbcc sqlperf(logspace) 返回的结果总是准确的，语句的执行不会对sql server增加负担

dbcc sqlperf(logspace)

二，查看数据库中，各个table 或index 所占用的disk space

1，查看数据库所有table 或index 所占用的disk space

select     t.name,    sum(case when ps.index_id<2 then ps.row_count else 0 end) as row_count,    sum(ps.reserved_page_count)*8/1024/1024 as reserved_gb,    sum(ps.used_page_count)*8/1024 as used_mb,    sum( case when ps.index_id<2                    then ps.in_row_data_page_count+ps.lob_used_page_count+ps.row_overflow_used_page_count              else 0 end        )*8/1024 as data_used_mb,    sum(case when ps.index_id>=2                 then ps.in_row_data_page_count+ps.lob_used_page_count+ps.row_overflow_used_page_count             else 0 end        )*8/1024 as index_used_mbfrom sys.dm_db_partition_stats psinner join sys.tables t    on ps.object_id=t.object_idgroup by t.object_id, t.nameorder by reserved_gb desc

2，在当前DB中，查看某一个Table object 空间使用信息

exec sp_spaceused 'dbo.dt_study'

rows:Number of rows existing in the table.

reserved:Total amount of reserved space for objname.

data:Total amount of space used by data in objname.

index_size:Total amount of space used by indexes in objname.

unused:Total amount of space reserved for objname but not yet used.

三，使用Standard Reports 查看disk space usage

四，查看服务器各个逻辑盘符剩余的disk space

Exec master.sys.xp_fixeddrives

Appendix：

查看数据库中table，indexed等对象的disk空间使用量，但是返回的结果并不十分精确。

sp_spaceused Displays the number of rows, disk space reserved, and disk space used by a table, indexed view, or Service Broker queue in the current database, or displays the disk space reserved and used by the whole database.

Syntax

sp_spaceused [[ @objname = ] 'objname' ]         [,[ @updateusage = ] 'updateusage' ]

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