If you mean the maintenance mode then you should know that in 12.2 there is no maintenance mode anymore.
Online patching does not require taking the application down for maintenance except for a brief period of time.
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You will be performing any patching, changes in patch edition and perform a cutover usually.
However, you can execute adadmin from run to perform actions like Compile Apps Schema, Generate Forms etc. This is similar to a hotpatch as we are directly maintaining the run file system.
Thank you guys