sys.dm_os_volume_stats (Transact-SQL)
Returns information about the operating system volume (directory) on which the specified databases and files are stored in SQL Server 2012. Use this dynamic management function to check the attributes of the physical disk drive or return available free space information about the directory.
.gif "Topic link icon")
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. 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);