Question 1

How do I set up Amnesia in an Elixir project?

Accepted Answer

Define a database module using defdatabase and tables with deftable, then run mix amnesia.create with options like --disk for persistence. Ensure Mnesia is started in your application supervision tree.

Question 2

Amnesia vs Ecto: which is better for Elixir?

Accepted Answer

Amnesia is ideal for distributed, transactional storage within Erlang/OTP, leveraging Mnesia's strengths. Ecto is better for SQL databases, offering broader adapter support and more flexible querying.

Question 3

How to handle backups with Amnesia?

Accepted Answer

Use Mnesia's backup functions via Amnesia's API, as it wraps all Mnesia behaviors. Refer to Mnesia documentation for details on disk backups and restore procedures.

Question 4

Can I use Amnesia without transactions for faster operations?

Accepted Answer

Yes, use dirty operations with bang methods (e.g., write! instead of write), but they sacrifice transaction guarantees and consistency, suitable only for performance-critical, non-critical data.

Question 5

Does Amnesia support auto-increment fields?

Accepted Answer

Yes, define attributes with { :id, autoincrement } in deftable, and Amnesia handles incremental keys on write, returning the updated record with the new id.

Question 6

How to query data with conditions in Amnesia?

Accepted Answer

Use Amnesia.Selection with Exquisite selectors, like Message.where user_id == 1, or define custom helper functions in table modules for common lookup patterns.

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