Microsoft SQL Server 2008 Administration for Oracle DBAs in .NET framework

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Microsoft SQL Server 2008 Administration for Oracle DBAs
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With 64-bit hardware now prevalent, the use of 32-bit is quickly diminishing Windows Server 2008 was the last 32-bit server-based OS from Microsoft Windows Server 2008 R2 and beyond are now only available as 64-bit, although SQL Server is still available in both 32- and 64-bit versions In our experience, for the past few years it has been very rare to find anyone deploying new SQL Servers on anything other than 64-bit Windows and SQL Server This section of the chapter describing the behavior of 32-bit systems is included for completeness and for those who are managing older SQL Server solutions 64-bit really does simplify and release some of the shackles the 32-bit version imposed on SQL Server In Windows, as with other operating systems, when a process is started it is assigned a Virtual Address Space (VAS) The VAS provides the process with a range of virtual memory addresses within which it can operate The size of the VAS is dictated by the processor architecture (32-bit or 64-bit) 32-bit CPUs can only directly address up to 4GB of RAM With an out-of-the-box installation of Windows, the top 2GB of this 4GB is reserved for the OS, leaving only 2GB for an application, as shown on the left side of Figure 2-15 It is possible to adjust this balance such that the OS reserves only 1GB of RAM and the application, such as SQL Server (or Oracle), can have the remaining 3GB This is achieved by setting an OS boot parameter switch known as the /3GB switch It is possible for a 32-bit machine to have greater than 4GB of RAM installed, in which case it needs a way to address this additional RAM Physical Address Extensions (PAE) is a technology introduced by the processor manufacturers to increase the address bus from 32 bits to 36 bits, allowing for access of up to 64GB of RAM
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Figure 2-15 32-bit 4GB address space is divided between OS and application
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2: SQL Server Architecture
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Windows can take advantage of PAE through the setting of a /PAE boot switch Although, setting /PAE only allows Windows to use greater than 4GB of physical RAM; it does not affect the size of the VAS, so processes are still restricted to 4GB of VAS To bypass this, Microsoft introduced Addressing Windows Extensions (AWE), a set of programming interfaces that allows developers to write programs that can address more memory than the standard 4GB For 64-bit CPUs the story is much simpler, as the VAS address space has a theoretical size in the exabyte range, though it is currently limited by Windows at 8TB The 3GB and PAE options no longer play a part in using this additional RAM Now that you have an understanding of how Windows uses memory, let s look at how SQL Server uses its VAS When SQL Server is first started, the VAS for the SQL Server process is divided into two areas, one for the buffer pool and the other as Reserved Address Space Most of the memory allocations that reside in the SGA and PGA in Oracle are controlled by the buffer pool in SQL Server The buffer pool is almost akin to a combined SGA and PGA where allocation for caches such as the SQL Server equivalents of the buffer cache and library cache and the workspace for queries all use memory allocated from the buffer pool The buffer pool itself consists of 8KB buffers and is the provider for all SQL Server memory allocations that require less than an 8KB contiguous page of memory This includes but is not limited to data cache, plan cache, connections, locks, and query workspace If an allocation of greater than 8KB is required, or memory is being requested by a component that is unable to interact with the buffer pool, then this is found in the VAS outside of what is allocated to the buffer pool How the VAS is used by SQL Server differs between the 32-bit and 64-bit platforms Figure 2-16 graphically depicts memory usage by SQL Server on a 32-bit platform with 4GB VAS
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