• https://support.microsoft.com/en-us/kb/907877

    VM Reserved: This value shows the overall amount of virtual address space (VAS) that SQL Server has reserved.

    VM Committed: This value shows the overall amount of VAS that SQL Server has committed. VAS that is committed has been associated with physical memory.

    Reserved doesn't mean used and it's not physical memorym it's virtual address space.

    To give you an idea, any 64-bit Windows machine has multiple TB of virtual address space which applications can reserve any amount of. They obviously don't have that as physical memory though, so applications can't commit more than the server has as physical (or more than the application is allowed to use)

    If you're not sure the interaction between virtual memory and physical memory, there are some really, really good videos by Mark Russinovich. Google should turn them up, they require a few watchings to understand properly though.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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