Groups > comp.databases.ms-sqlserver > #2265

Memory usage: Working set much lower than Commit size

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From	Anton Shepelev <anton.txt@g{oogle}mail.com>
Newsgroups	comp.databases.ms-sqlserver
Subject	Memory usage: Working set much lower than Commit size
Date	Tue, 3 Jun 2025 11:51:59 +0300
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Hello, all

One of our clients' servers (VMWare guest) was sagging under
RAM defficiency with nearly empty dm_exec_query_stats and
dm_exec_cached_plans until we unabled Lock Pages in Memory
for it:

  https://learn.microsoft.com/en-us/sql/database-engine/configure-windows/enable-the-lock-pages-in-memory-option-windows?view=sql-server-ver17

Now things look OK inisde MSSQL:

SELECT
     info.physical_memory_kb  / 1024                    AS phys_mem_mb  , -- 24 575
     info.committed_kb        / 1024                    AS committed_mb , -- 12 287
     info.committed_target_kb / 1024                    AS ci_target_mb , -- 12 288
     buf .mb                                            AS buf_size_mb  , -- 10 246
     pmem.memory_utilization_percentage                 AS mem_util_perc, --    100
     pmem.process_physical_memory_low                   AS phys_mem_low , --      0
     (  SELECT COUNT(*) FROM sys.dm_exec_query_stats  ) AS qstats_n     , -- 11 887
     (  SELECT COUNT(*) FROM sys.dm_exec_cached_plans ) AS qplans_n       -- 17 774
FROM
     sys.dm_os_sys_info       info,
     sys.dm_os_process_memory pmem,
     (    SELECT
          COUNT(*) * 8/1024 mb
          FROM sys.dm_os_buffer_descriptors
     ) buf

But /Task Manager/ shows the following for sqlservr.exe:

  Working set:    254 084 K
  Commit size: 12 855 404 K

Does it mean MSSQL has allocated 13G of RAM but is using
only 254M?  Or does the Working set somehow not include a
lot of RAM that MSSQL is using with /Lock Pages in Memory/
on?

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Memory usage: Working set much lower than Commit size Anton Shepelev <anton.txt@g{oogle}mail.com> - 2025-06-03 11:51 +0300
  Re: Memory usage: Working set much lower than Commit size Erland Sommarskog <esquel@sommarskog.se> - 2025-06-03 20:44 +0200

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