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A rolling upgrade moves a NuoDB domain, which might include multiple databases, to a new NuoDB release without shutting down the databases.
Perform a rolling upgrade when continuous database availability is a requirement. If continuous data availability is not a requirement, see Upgrading With Databases Down.
See one of the following topics according to your current NuoDB release:
Rolling Upgrade From NuoDB 2.3
Rolling Upgrade From NuoDB 2.4
Rolling Upgrade From NuoDB 2.5