Microsoft® SQL Server 2008 R2 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Side-by-Side Migration
SQL Server 2008 can coexist without a problem on the same servers as any existing SQL Server 2000 or 2005 instances. SQL Server 2008 R2 can coexist on the same servers as any existing SQL Server 2000, 2005, or 2008 instances. This means you can install one or more instances of SQL Server 2008 or 2008 R2 without performing an in-place upgrade of any pre-2008 instances. You don’t have to worry about whether you’re breaking existing functionality. Side-by-side migration is therefore an easy option to investigate.
Note
If you are doing a side-by-side installation, be sure your server has sufficient resources (CPU, memory, disk space) to support running multiple instances of SQL Server.
Many administrators favor the side-by-side ...
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