Why enable MAINTENANCE mode ??


To ensure optimal performance and reduce downtime during patching sessions, Auto-Patch requires that you enable Maintenance mode when you apply a patch. Enabling this feature shuts down the Workflow Business Events System and sets up function security so that Oracle Applications functions are unavailable to users. This provides a clear separation between normal run time operation and system downtime for patching.



               OR


Enabling Maintenance  mode will do these things briefly:-

1) As source code is modifying due to the patch, triggers,workflows events will be disabled.
2) No Users will be able to connect, as which will cause the problems.
 

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