Artikel
10/04/2012

sys.dm_os_volume_stats (Transact-SQL)

Returns information about the operating system volume (directory) on which the specified databases and files are stored. Use this dynamic management function in SQL Server 2008 R2 SP1 and later versions to check the attributes of the physical disk drive or return available free space information about the directory.

Topic link icon Transact-SQL Syntax Conventions

Syntax

sys.dm_os_volumne_stats (database_id, file_id)

Arguments

database_id
ID of the database. database_id is int, with no default. Cannot be NULL.
file_id
ID of the file. file_id is int, with no default. Cannot be NULL.

Table Returned

Column	Data type	Description
database_id	int	ID of the database. Cannot be null.
file_id	int	ID of the file. Cannot be null.
volume_mount_point	nvarchar(512)	Mount point at which the volume is rooted. Can return an empty string.
volume_id	nvarchar(512)	Operating system volume ID. Can return an empty string
logical_volume_name	nvarchar(512)	Logical volume name. Can return an empty string
file_system_type	nvarchar(512)	Type of file system volume (for example, NTFS, FAT, RAW). Can return an empty string
total_bytes	bigint	Total size in bytes of the volume. Cannot be null.
available_bytes	bigint	Available free space on the volume. Cannot be null.
supports_compression	bit	Indicates if the volume supports operating system compression. Cannot be null.
supports_alternate_streams	bit	Indicates if the volume supports alternate streams. Cannot be null.
supports_sparse_files	bit	Indicates if the volume supports sparse files. Cannot be null.
is_read_only	bit	Indicates if the volume is currently marked as read only. Cannot be null.
is_compressed	bit	Indicates if this volume is currently compressed. Cannot be null.

Security

Permissions

Requires VIEW SERVER STATE permission.

Examples

A. Return total space and available space for all database files

The following example returns the total space and available space (in bytes) for all database files in the instance of SQL Server.

SELECT f.database_id, f.file_id, volume_mount_point, total_bytes, available_bytes
FROM sys.master_files AS f
CROSS APPLY sys.dm_os_volume_stats(f.database_id, f.file_id);

B. Return total space and available space for the current database

The following example returns the total space and available space (in bytes) for the database files in the current database.

SELECT database_id, f.file_id, volume_mount_point, total_bytes, available_bytes
FROM sys.database_files AS f
CROSS APPLY sys.dm_os_volume_stats(DB_ID(f.name), f.file_id);

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