Performance Tuning with SQL Server Dynamic Management Views

Chapter 7: OS and Hardware Interaction
When memory utilization is just right, the value will be "Physical memory state is steady."
For short periods, you may very occasionally see a third value of "Physical memory state
is transitioning," indicating that the memory state is changing from high to low, or
vice versa.
Using these five columns, as shown in Listing 7.22, we can get an overview of how much
RAM is available to the operating system in total, and how much of it is currently not in
use. The first and second values correspond to the Task Manager Physical Memory (MB)
values for total and available memory.
SELECT total_physical_memory_kb / 1024 AS total_physical_memory_mb ,
available_physical_memory_kb / 1024 AS available_physical_memory_mb ,
total_page_file_kb / 1024 AS total_page_file_mb ,
available_page_file_kb / 1024 AS available_page_file_mb ,
system_memory_state_desc
FROM sys.dm_os_sys_memory
Listing 7.22: System memory usage.
The following results were taken from my writing laptop with just under 2 GB of RAM
(some allocated to video RAM).
total_physical_memory_mb available_physical_memory_mb total_page_file_kb
------------------------ ---------------------------- --------------------
1912 912 3825
available_page_file_kb system_memory_state_desc
---------------------- ---------------------------------
2265 Available physical memory is high
304