sys.dm_os_sys_memory (Transact-SQL)
Returns memory information from the operating system.
SQL Server is bounded by, and responds to, external memory conditions at the operating system level and the physical limits of the underlying hardware. Determining the overall system state is an important part of evaluating SQL Server memory usage.
Column name |
Data type |
Description |
|---|---|---|
total_physical_memory_kb |
bigint |
Total size of physical memory available to the operating system, in kilobytes (KB). |
available_physical_memory_kb |
bigint |
Size of physical memory available, in KB. |
total_page_file_kb |
bigint |
Size of the commit limit reported by the operating system in KB |
available_page_file_kb |
bigint |
Total amount of page file thatis not being used, in KB. |
system_cache_kb |
bigint |
Total amount of system cache memory, in KB. |
kernel_paged_pool_kb |
bigint |
Total amount of the paged kernel pool, in KB. |
kernel_nonpaged_pool_kb |
bigint |
Total amount of the nonpaged kernel pool, in KB. |
system_high_memory_signal_state |
bit |
State of the system high memory resource notification. A value of 1 indicates the high memory signal has been set by Windows. For more information, see CreateMemoryResourceNotification in the MSDN library. |
system_low_memory_signal_state |
bit |
State of the system low memory resource notification. A value of 1 indicates the low memory signal has been set by Windows. For more information, see CreateMemoryResourceNotification in the MSDN library. |
system_memory_state_desc |
nvarchar(256) |
Description of the memory state.
ConditionValue
system_high_memory_signal_state = 1 and system_low_memory_signal_state = 0Available physical memory is high
system_high_memory_signal_state = 0 and system_low_memory_signal_state = 1 Available physical memory is low
system_high_memory_signal_state = 0 and system_low_memory_signal_state = 0Physical memory usage is steady
system_high_memory_signal_state = 1 and system_low_memory_signal_state = 1Physical memory state is transitioning The high and low signal should never be on at the same time. However, rapid changes at the operating system level can cause both values to appear to be on to a user mode application. The appearance of both signals being on will be interpreted as a transition state.
|
Permissions
Requires VIEW SERVER STATE permission on the server.