Overview of upgrade and migration tasks
The upgrade and migration procedures are specific for the OS, current version of Oracle, and taget version of Oracle you are using. The high-level order of procedures:
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Upgrade OS if required
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Upgrade to Storage Foundation 5.0 for Oracle RAC 5.0
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Install target version of Oracle, including patchsets if required
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Migrate the database if a full Oracle install is performed
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Relink the Veritas libraries if a patchset is applied rater than a full install of Oracle