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The Working Set performance counter keeps increasing under a moderate load. When the load has subsided, the counter remains constantly high. It does not decrease memory used.
The Store.exe process has a counter called "Working Set." This counter displays the current amount of RAM used by the information store code and its related data. When memory is reserved, it does not free until the process is stopped and restarted; however, if Windows NT swaps some of these pages from RAM to disk, the performance monitor value will decrease to reflect the change in the amount of RAM being used by the information store.
This is by design.
This memory is just reserved, not allocated. If the server is under stress from another application, these pages will be swapped to the page file to free up RAM, which will reduce the Working Set size.
Article ID: 184699 - Last Review: October 7, 2013 - Revision: 3.3