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sys.dm_os_volume_stats (Transact-SQL)

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Applies to: SQL Server

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

Transact-SQL syntax conventions

Syntax

sys.dm_os_volume_stats (database_id , file_id)

Arguments

database_id

ID of the database. database_id is int, with no default. Can't be NULL.

file_id

ID of the file. file_id is int, with no default. Can't be NULL.

Table returned

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

0: No seek penalty on this volume, typically when the storage device is PMM or SSD

1: Seek penalty on this volume, typically when the storage device is HDD

2: The storage type can't be determined when the volume is on a UNC path or mounted shares

NULL: The storage type can't be determined on Linux operating system

Applies to: SQL Server 2019 (15.x) and later versions

Permissions

SQL Server 2019 (15.x) and earlier versions require VIEW SERVER STATE permission on the server.

SQL Server 2022 (16.x) and later versions require VIEW SERVER PERFORMANCE STATE permission on the server.

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.file_id);

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