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We had adopted Erlang in the real-time trading system and it is online now. However I hope mnesia will break 2G limitation in the near future.

The limit is on disk-only tables (due to Dets using 32-bit file offsets). The limit of on-memory tables is 16 exabytes on 64-bit systems.

On-memory tables. But what would you do when you need to restart the program, or the entire system? Or can you persist the on-memory on disk somehow?