Patch in Oracle Database
Patch is a piece of software or code designed to fix the problems of the existing software. These fixes can be security vulnerability fixes or bug fixes. In certain cases the patches increases or enhances the functionality of the software as well
Interim patch
Interim patches are also known as “one of patches”. Interim patches are released in between the release of CPU or PSU patch to fix a specific issue. These patches generally address specific bug’s fixes for a specific customer and should not be applied unless specified by Oracle support services.
Diagnostic patch
It’s a type of interim patch used for the diagnosis of a specific issue. As the name indicates this patches doesn’t fix an issue but helps us to understand an issue it is mostly used by Oracle support services.
Bundle patch
It’s a cumulative patch issued between patch set bundles. patches normally include only fixes but sometimes they include minor enhancements as well. Example Windows bundle patch
Critical patch update (CPU)
These are the cumulative patches consisting of security fixes. The new name for the critical patch updates is security patch update. CPU or SPU provide the security fixes for a single product eg: Oracle Database 11.2.0.1. These patches are cumulative for the same product or a component For example Oracle database 11.2.0.1
Critical patch updates or CPUs are released on quarterly basis.
Mostly they are released on the third week of January, April, July and October.
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