How do you create a Mnesia schema?

Creating a schema is a one-time setup step, typically run from an Erlang shell before your application starts Mnesia for the first time, specifying which nodes will participate in the database.

1> mnesia:create_schema([node()]).
ok
2> mnesia:start().
ok

mnesia:create_schema/1 takes a list of node names and writes the initial schema metadata to disk on each of them — it will fail if Mnesia is already running on any of those nodes, since the schema has to be laid down before the system is live. For a multi-node cluster, you'd list every participating node in that same call so they all start out with a consistent, shared schema from the beginning.

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