Single instance
Apply Patching On Oracle 21c Database Release Update 21.7.0.0.0Apply Patching On Oracle 19c Database Release Update 19.9.0.0.201020Apply Patching On Oracle 19c Database Release Update 19.6.0.0.200114Oracle 19c Database Release Update Revision 19.4.1.0.0Apply Patching On Oracle 19c Database Release Update 19.5.0.0.0Deinstallation Release Update Patch on oracle 19c (Patch 29834717)Apply Patching On Oracle 19c Database Release Update 19.4.0.0.0Patching Oracle Database Release Updates Revision (RUR) 18.3.2.0.0 to 18.4.1.0.0Patching Oracle Database Release Updates Revision (RUR) 18.3.0.0.0 to 18.3.2.0.0Step-by-Step Applying PSU Patch in Oracle 12c For Single-Instance