When we plan for an upgrade from MOSS 2007 or WSS 3.0 to SharePoint 2010 Products, we have different upgrade approaches as building blocks that can be used for optimal upgrade approach.
In-place upgrade: Use this approach to install the new version of SharePoint 2010 products on the same hardware that is used for the previous version. Upgrade the content and settings in the server farm as part of a single process.
Databases attach upgrade: Use this approach to upgrade the content for the environment on a separate farm. It doesn't upgrade any of the services or farm settings. Content databases can be upgraded in any order and can upgrade several databases at the same time. Using this approach, its possible to attach a Shared Service Provider database during DB attach upgrade, this will upgrade the profile information in the database. Using this approach, it’s not possible to upgrade the search database.
Hybrid approaches: A hybrid approach lets us to take advantage of in-place upgrade's ability to upgrade content and settings, while we take advantage of the speed of a database attach upgrade. The advantages of this method is
· Farm wide settings can be preserved and upgraded
· Customizations are available in the environment after upgrade, although manual steps may be required to upgrade or rework
We can upgrade multiple content databases at the same time, which results in faster upgrade times overall than an in-place upgrade. For more information on Upgrade Process please refer to http://technet.microsoft.com/en-us/library/cc262483(office.14).aspx
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