Wrapper around mnesia to make it easier to share mnesia among several applications on the same Erlang node. The wrapper initializes mnesia. The applications call erl_mnesia to create or wait for their tables.
Add erl_mnesia as a dependency to the application using mnesia. In sys.config for the node, add environment variables for erl_mnesia.
| Variable | Description |
|---|---|
| options | list of options |
The possible options are:
| Option | Description |
|---|---|
| persistent | Set schema's table copy type to disc_copies |
Notes:
- Once the schema's table copy type is set to
disc_copies, removing thepersistentoption does set the table copy back toram_copies.
Applications using mnesia call erl_mnesia:tables/1 early in their initialization with a list consisting key/value tuples, where the key is the table name and the value is the table definition. erl_mnesia creates the table if it does not already exist, or waits for the table if it does exist. erl_mnesia:tables/1 does not return until all of the tables are created and ready.