sys.dm_os_sys_info (Transact-SQL)

Returns a miscellaneous set of useful information about the computer, and about the resources available to and consumed by SQL Server.

Column name	Data type	Description
cpu_ticks	bigint	Specifies the current CPU tick count. CPU ticks are obtained from the processor's RDTSC counter. It is a monotonically increasing number. Not nullable.
ms_ticks	bigint	Specifies the number of milliseconds since the computer started. Not nullable.
cpu_count	int	Specifies the number of logical CPUs on the system. Not nullable.
hyperthread_ratio	int	Specifies the ratio of the number of logical or physical cores that are exposed by one physical processor package. Not nullable.
physical_memory_kb	bigint	Specifies the total amount of physical memory on the machine. Not nullable.
virtual_memory_kb	bigint	Specifies the total amount of virtual address space available to the process in user mode. Not nullable.
committed_kb	int	Represents the committed memory in kilobytes (KB) in the memory manager. Does not include reserved memory in the memory manager. Not nullable.
committed_target_kb	int	Represents the amount of memory, in kilobytes (KB), that can be consumed by SQL Server memory manager. The target amount is calculated using a variety of inputs like: the current state of the system including its load the memory requested by current processes the amount of memory installed on the computer configuration parameters If committed_target_kb is larger than committed_kb, the memory manager will try to obtain additional memory. If committed_target_kb is smaller than committed_kb, the memory manager will try to shrink the amount of memory committed. The committed_target_kb always includes stolen and reserved memory. Not nullable.
visible_target_kb	int	Is the same as committed_target_kb. Not nullable.
stack_size_in_bytes	int	Specifies the size of the call stack for each thread created by SQL Server. Not nullable.
os_quantum	bigint	Represents the Quantum for a non-preemptive task, measured in milliseconds. Quantum (in seconds) = os_quantum / CPU clock speed. Not nullable.
os_error_mode	int	Specifies the error mode for the SQL Server process. Not nullable.
os_priority_class	int	Specifies the priority class for the SQL Server process. Nullable. 32 = Normal (Error log will say SQL Server is starting at normal priority base (=7).) 128 = High (Error log will say SQL Server is running at high priority base. (=13).) For more information, see Configure the priority boost Server Configuration Option.
max_workers_count	int	Represents the maximum number of workers that can be created. Not nullable.
scheduler_count	int	Represents the number of user schedulers configured in the SQL Server process. Not nullable.
scheduler_total_count	int	Represents the total number of schedulers in SQL Server. Not nullable.
deadlock_monitor_serial_number	int	Specifies the ID of the current deadlock monitor sequence. Not nullable.
sqlserver_start_time_ms_ticks	bigint	Represents the ms_tick number when SQL Server last started. Compare to the current ms_ticks column. Not nullable.
sqlserver_start_time	datetime	Specifies the date and time SQL Server last started. Not nullable.
affinity_type	int	Specifies the type of server CPU process affinity currently in use. Not nullable. For more information, see ALTER SERVER CONFIGURATION (Transact-SQL). 1 = MANUAL 2 = AUTO
affinity_type_desc	varchar(60)	Describes the affinity_type column. Not nullable. MANUAL = affinity has been set for at least one CPU. AUTO = SQL Server can freely move threads between CPUs.
process_kernel_time_ms	bigint	Total time in milliseconds spent by all SQL Server threads in kernel mode. This value can be larger than a single processor clock because it includes the time for all processors on the server. Not nullable.
process_user_time_ms	bigint	Total time in milliseconds spent by all SQL Server threads in user mode. This value can be larger than a single processor clock because it includes the time for all processors on the server. Not nullable.
time_source	int	Indicates the API that SQL Server is using to retrieve wall clock time. Not nullable. 0 = QUERY_PERFORMANCE_COUNTER 1 = MULTIMEDIA_TIMER
time_source_desc	nvarchar(60)	Describes the time_source column. Not nullable. QUERY_PERFORMANCE_COUNTER = the QueryPerformanceCounter API retrieves wall clock time. MULTIMEDIA_TIMER = The multimedia timer API that retrieves wall clock time.
virtual_machine_type	int	Indicates whether SQL Server is running in a virtualized environment. Not nullable. 0 = NONE 1 = HYPERVISOR 2 = OTHER
virtual_machine_type_desc	nvarchar(60)	Describes the virtual_machine_type column. Not nullable. NO = SQL Server is not running inside a virtual machine. HYPERVISOR = SQL Server is running inside a hypervisor, which implies a hardware-assisted virtualization. If the instance is running on the host OS, the description will still return HYPERVISOR. OTHER = SQL Server is running inside a virtual machine that does not employ hardware assistant such as Microsoft Virtual PC.

Permissions

Requires VIEW SERVER STATE permission on the server.

Compatibility Support

In SQL Server 2012, the following columns have been renamed.

Previous Column Name	New Column Name
physical_memory_in_bytes	physical_memory_kb
bpool_commit_target	committed_target_kb
bpool_visible	visible_target_kb
virtual_memory_in_bytes	virtual_memory_kb
bpool_commited	committed_kb

See Also

Reference

Dynamic Management Views and Functions (Transact-SQL)

SQL Server Operating System Related Dynamic Management Views (Transact-SQL)