What happens if a SBDF file is read while written or viceversa?

By example if you have a 1GB SBDF file, that to load take 5 minutes A user start opening it and in the course of those 5 minutes another user wants to overwrite it, What will happen? Other situation would be the opposite, a user starts overwriting the SBDF file, while some seconds later another user starts reading the same file.

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