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I need a way to check if some MMF (Memory mapped file) is exists or not before accessing it, in a managed way.
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Yes. If one thread changes part of the data in the mapping, then all other threads immediately see that change.
Performance: Memory mapped writing is often fast as no stream/file buffers are used. OS does the actual file writing, usually in blocks of several kilo bytes at once. One downside would be, unless you're writing sequentially there could be page faults slowing down your program.
But there are also disadvantages: An I/O error on a memory-mapped file cannot be caught and dealt with by SQLite. Instead, the I/O error causes a signal which, if not caught by the application, results in a program crash.
You can use : MemoryMappedFile.OpenExisting method. It raises FileNotFoundException in case if specified file is not present.
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