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32-Bit Versus 64-Bit Platforms and Microsoft SQL Server 2005
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you run the 64-bit version of SQL Server 2005. The x64 architecture is summarized in Table 5-2.
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Table 5-2
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x64 Architecture Memory Summary
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Value Notes Later will be increased to 4 petabytes Architecture supports 16 exabytes 1 terabyte 256 terabyte
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Physical memory Virtual memory
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The x64 architecture summary table refers to the x64 architecture running in 64-bit mode.
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Because of the flexibility and performance of the x64 architecture, I expect to see the industry moving to 64-bit very quickly. In fact, most server systems are currently shipping with this processor.
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Itanium
The Itanium architecture is also known as the IA-64 architecture. This architecture was developed in 1989 when HP collaborated with Intel to develop a replacement for its PARISC line of processors. Microsoft has ported versions of Windows XP, Windows 2000, and Windows 2003 for the Itanium processor, and SQL Server is supported on Windows 2000 and Windows 2003 Itanium 2 platforms. The Itanium 2 processor is fairly popular, and there are many SQL Server implementations on Itanium 2.
Itanium 2 Versus x86-64
My opinion is that the x86-64 processor will very soon become the platform of choice for 64-bit SQL Server. Because of its flexibility, price, and the fact that it has already replaced all i386 chips for the server, I believe that the Itanium 2 platform will soon be used only for large Unix servers. There will still be a few companies that prefer the Itanium 2 platform, but they will be a small minority. The Itanium 2 processor is a 64-bit processor that can run some Windows 32-bit programs in a 32-bit emulation mode. This emulation mode is not very efficient, and 32bit programs are not known to work very well on the Itanium 2 platform. This is why it is recommended that 64-bit SQL Server be run on this platform. There is a version of SQL Server 2000 for Itanium 2, but only the server components are available. All
Part II
System Design and Architecture
management must be done from a 32-bit system. The Itanium 2 architecture is summarized in Table 5-3.
Table 5-3
Itanium 2 Architecture Memory Summary
Value Notes Physical addressing is 50-bits. This is the full 64-bit address. 1 petabyte 16 exabytes
Physical memory Virtual memory
One key advantage of the Itanium 2 processor is that it is typically found in higherend systems. While you are most likely to find the EM64T and Opteron processors in 2 through 8 CPU systems, you might see high-end systems support up to 128 Itanium processors in a single system. This is an advantage for high-end customers. These systems are usually very high-end with exceptional levels of support, I/O bandwidth, and expandability.
Windows Versions
There are a number of Windows Server versions available that accommodate SQL Server 2005. Each of these systems has its own advantages and limitations. This section provides an overview of the various choices.
Windows 2000
Windows 2000 is available in both an x86 and an Itanium version. Windows 2000 includes many improvements over Windows NT. Advancements include an improved memory management system and improved networking capabilities, as well as improvements in the domain administration and functionality. Windows 2000 is available in Server, Advanced Server, and Datacenter Server Editions. The Server Edition is more limited than the Advanced Server Edition in both the number of CPUs supported and the amount of RAM supported. Datacenter Server Edition is enhanced in support of processors and memory as well as in the enhanced technical support that it is available for it. Because Windows 2000 has been rendered obsolete by Windows Server 2003, it will not be covered in detail in this book. Note
The limits of SQL Server 2005 depend on both the version of Windows that you are running and the version of SQL Server.
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32-Bit Versus 64-Bit Platforms and Microsoft SQL Server 2005
Windows Server 2003
At the time of this book s publication, Windows Server 2003 is the most current version of Windows available. Windows Server 2003 is available in an x86, an x64, and an Itanium version. Windows Server 2003 includes many improvements over Windows 2000, including Active Directory. From a purely SQL Server point of view, the most important features that were provided in Windows Server 2003 were the x64 support and the enhanced PAE support for x86. In addition, clustering was greatly improved in Windows Server 2003. Like Windows 2000, Windows Server 2003 comes in a variety of editions, including Standard Edition, Enterprise Edition, and Datacenter Edition. The features of the Windows Server 2003 32bit editions are shown in Table 5-4.
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