On bog standard iron, this is a fairly simple procedure. Download the patch, stop the databases and listeners and opatch the ORACLE_HOME. See general procedure Applying patches<br /> a word about the different patching terminology;overlay, merge, bundle etc..<br />

• how to apply patch in oracle

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dba_registry_history is a view on registry$history

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Now things are getting more interesting…<br />

• Patching Oracle Database Appliance (ODA)
• Patching Exadata