Standby: Pages of physical ram not actively being used. These are still left in physical ram but will be repurposed first by the memory manager (either returned to the active list or zeroed out and reused) if something needs physical ram for active pages. Standby pages are essentially cache ? it?s better to have infrequently used data kept in RAM ?just in case? than pushing it out to disk when the memory isn?t needed for anything else.
As we see here the Cache is mainly comprised of memory pages in the standby list.
In this scenario, the OS is keeping Memory pages in Standby so that they can be immediately given to a process or a service requesting RAM. As you can see, Mapped File Total equals the amount of Available bytes we saw in our Perfmon log.
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