sys.dm_os_process_memory is SQL Server's process-level counterpart to the operating system's own memory counters — a single row reporting exactly how much of the machine's memory space the sqlservr.exe process is holding, down to large-page allocations, committed virtual address space, and two flags that fire the …

Buffer pool counters explain data cache pressure but go silent the moment memory trouble comes from somewhere else. sys.dm_os_memory_clerks lists every active memory clerk — buffer pool, plan cache, In-Memory OLTP, Query Store, query memory grants, Extended Events — and reports pages_kb per clerk. Grouping those rows …