For example, I saved {id, name}in mnesia and want to update to {id, name, age}, do I need to call transform_tableevery time I change the circuit?
{id, name}
{id, name, age}
transform_table
The easiest way is to delete the table and recreate it. If you need to save data in a table, mnesia:transform_tablethis is the way to go.
mnesia:transform_table