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High Availability and Disaster Recovery Options for DB2 for Linux, UNIX, and Windows by Karol Zimnol, Marko Vrhovnik, Klaus Subtil, Mohamed Soliman, Jan Nelken, Anas Mosaad, Marcin Marczewski, Michael Loster, Adrian Kalicki, Ciaran De Buitlear, Stanislaw Bartkowski

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DB2 and system upgrades
In this chapter, we focus on applying fix packs and version upgrades to DB2 High Availability Disaster Recovery (HADR) databases. Fix packs can be applied with no downtime and DB2 upgrades can be applied with minimal downtime. We also explore important considerations that relate to any changes to other system components that might require DB2 or the whole server to be restarted. Lastly, we provide an overview of what to consider when you update certain database configuration parameters.
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