To download Oracle patches, you must have a valid Support Identifier (CSI) number and access to Oracle's Metalink Web site. With access to Metalink, you can navigate to the "Patches and Updates" tab and select the patches you require.
Patching your Oracle 10g database can involve one of two types of patches: Critical Patch Updates (CPUs), which are security patches released by Oracle every quarter, and patchset releases, which allow you to patch your database to the next minor release level (e.g., 10.1.0.3 to 10.1.0.4). Both the CPUs and the patchset releases are obtained via Metalink.
Dig Deeper on Oracle database installation, upgrades and patches
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