atomicity of trigger replacement

Good Evening,

I'd like to replace an existing trigger implementation with a better implementation that is logically identical but gives better performance.

I want to make sure that, during fraction of a second it takes to 'create or replace trigger....', any triggering events will either block until the new trigger is in place or use the old trigger, rather than slipping through the gap. Do I need to take special precautions, or does Oracle automatically ensure this?

Thanks,

Xho

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