What are CPUs and PSUs and how are they applied them to Oracle?

Category: asked February 13, 2013

1 Answer


Oracle  Critical Patch Update(CPU) are collections of security fixes for Oracle products, Patch Set Updates (PSUs) are proactive cumulative patches containing recommended bug fixes that are released on a regular and predictable schedule.

Database Server customers have a choice when each Critical Patch Update is released: they can opt to receive security fixes only (using the traditional N-apply CPU patches) or they can opt to receive a more comprehensive set of security and non-security fixes (using the Patch Set Update patches).

Once a PSU has been applied on the system, the recommended method to apply all future CPU program security content is to apply future PSUs. In other words, once a PSU has been applied, it is not recommended to switch back to traditional N-apply patches.