ADOP (R12.2 Online Patching)

Online patching is the most important new feature in Oracle EBS 12.2. It is the ability to patch a running system without having to take the system down for a significant period of time while the patches are applied. Even you can apply Maintenance Pack 12.2.2 or 12.2.3 or 12.2.4 once you install or upgrade to R12.2.0 base.

• It will enable R12.2 PATCH Environment.
• Dependancy on opatches. All Opatches must be applied before enabling ADOP.
• Missing Opatches will be reported by EBS DB CodeLevel Checker script.
• All AD_ZD packages should be valid before enabling them.
• To implement Online Patching Run reports/scripts mentioned in Using the Online Patching Readiness Report in Oracle E-Business Suite Release 12.2 [1531121.1]
• Once you enable ADOP i.e. Online Patching you cannot apply any patches through ADPATCH.
• All patches applied using adop utility will be applied to PATCH environment.
• When you want to make the patches live you can execute adop using cutover phase. It will switch filesystems.

To synchronize both filesystems i.e. fs1 and fs2 you can execute adop using fs_clone phase.
Phases:

adop phase=prepare -> copies the application code
adop phase=apply -> apply patches to PATCH Environment
adop phase=finalize -> makes ready the system for cutover
adop phase=cutover -> bounce the system and does filesystem switchover. fs2 becomes RUN environment.
adop phase=cleanup -> remove obsolete objects.
adop phase=fs_clone -> synchronize filesystems