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What is virtual address space in SQL Server?
In Sql Server, Buffer Pool is where all the Data/Proc/Log Cache, etc are located. Virtual Address Space is a logical location that refers to physical locations (either in RAM or page file).
What is minimum memory per query in SQL Server?
The min memory per query option specifies the minimum amount of memory (in kilobytes) that will be allocated for the execution of a query. This is also known as the minimum memory grant. For example, if min memory per query is set to 2,048 KB, the query is guaranteed to get at least that much total memory.
How many GB of memory does SQL Server use?
Older versions of SQL Server could run on a 32-bit operating system. Accessing more than 4 gigabytes (GB) of memory on a 32-bit operating system required Address Windowing Extensions (AWE) to manage the memory. This is not necessary when SQL Server is running on 64-bit operation systems.
How big is the virtual address space in Windows NT?
When Windows NT was first being developed back in the early 1990s you were lucky to find hard disks with a capacity over 2GB, let alone that much physical RAM. The initial design decision was to split the 4GB virtual address space that every 32-bit process would be limited to into two halves.
Why is the 32 bit memory limit virtual?
The limit mirrors that of a 32-bit pointer and is deemed ‘virtual’ because the address pointer does not refer to physical memory but is actually a logical address. Instead, the page belonging to the address can be mapped anywhere within physical RAM or even inside a page-file.
How is address space mapped to physical memory?
The committed regions of address space are mapped to the available physical memory by the Windows Virtual Memory Manager (VMM). For more information on the amount of physical memory supported by different operating systems, see the Windows documentation on Memory Limits for Windows Releases.