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Migration of large Oracle Databases such as data warehouses and decision support systems, which can easily consume many terabytes, presents one of the biggest technical challenges for any organization. This paper discusses various procedures for the nondisruptive upgrade and migration of Oracle Database to Data ONTAP 8.0 7-Mode 64-bit aggregates. This nondisruptive process of migration not only allows each node of active-active controllers to be upgraded individually to a newer version of Data ONTAP or firmware, it also provides the ability to transparently perform hardware upgrades and maintenance on the active-active controller nodes.
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