Migration Guide : 1. Planning the Upgrade : Upgrade Methods
 
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Upgrade Methods
There are four options for upgrading your production systems:
Uninstalling the Previous Version OpenROAD and Installing the New Version
Installing OpenROAD into the Same Ingres Instance as the Older Version of OpenROAD
Installing OpenROAD into a New Ingres Instance
Installing OpenROAD with a Standalone Embedded Version of the Ingres 10 Client
Note:  When installing OpenROAD 6.2 into an existing version of Ingres, it must be Ingres 10.1.1 or later.
For more information about the requirements for establishing a new OpenROAD 6.2 environment, see Creating a New OpenROAD Environment.