What is a Mnesia schema?

The schema is Mnesia's own metadata table — it tracks which tables exist, their storage types, which nodes hold a copy of each, and other structural information about the database itself, separate from the actual row data inside your tables.

mnesia:create_schema([node()]).
mnesia:start().

mnesia:create_schema/1 must be run once, before Mnesia starts, to initialize this metadata on disk for the given list of nodes. Every table you later create with mnesia:create_table/2 gets registered into this schema, which is itself replicated to every node listed when the schema was created, so each participating node has a consistent view of what tables exist and where their copies live.

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