Microsoft SQL Server 2008 R2 Specifications Page 36

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16 CHAPTER 1 SQL Server 2008 R2 Editions and Enhancements
Installation, Upgrade, and Migration Strategies
Like its predecessors, SQL Server 2008 R2 is available in both 32-bit and 64-bit editions, both
of which can be installed either with the SQL Server Installation Wizard or through a com-
mand prompt. As was briey mentioned earlier in this chapter, it is now also possible to use
Sysprep in conjunction with SQL Server for automated deployments with minimal administra-
tor intervention.
Last, DBAs also have the option to upgrade an existing installation of SQL Server or
conduct a side-by-side migration when installing SQL Server 2008 R2. The following sections
elaborate on the different strategies.
The In-Place Upgrade
An in-place upgrade is the upgrade of an existing SQL Server installation to SQL Server 2008
R2. When an in-place upgrade is conducted, the SQL Server 2008 R2 setup program replaces
the previous SQL Server binaries with the new SQL Server 2008 R2 binaries on the same
machine. SQL Server data is automatically converted from the previous version to SQL Server
2008 R2. This means that data does not have to be copied or migrated. In the example in
Figure 1-5, a DBA is conducting an in-place upgrade on a SQL Server 2005 instance running
on Server 1. When the upgrade is complete, Server 1 still exists, but the SQL Server 2005
instance, including all of its data, is now upgraded to SQL Server 2008 R2.
Upgrade
Pre-migration Post-migration
Server 1
SQL Server 2005
Server 1
SQL Server 2008 R2
FIGURE 1-5 An in-place upgrade from SQL Server 2005 to SQL Server 2008 R2
NOTE SQL Server 2000, SQL Server 2005, and SQL Server 2008 are all supported for an
in-place upgrade to SQL Server 2008 R2. Unfortunately, earlier editions, such as SQL Server
7.0 and SQL Server 6.5, cannot be upgraded to SQL Server 2008 R2.
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