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Database / Mnesia basics Interview questions

Describe the difference between a Mnesia table and an ETS table?

Mnesia tables are actually built on top of ETS (or DETS for disk-only storage), so they share the same underlying storage engine — the difference is entirely in what Mnesia layers on top.

ETS tableMnesia table
Node-local only; no built-in replication.Can be replicated across multiple nodes.
No built-in transactions; operations are inherently "dirty." Supports ACID-style transactions across multiple tables and nodes.
In-memory only.Can be in-memory, on-disk, or both, per table.
Lower overhead per operation.Extra overhead for transaction coordination and replication.

In short: ETS gives you raw, fast, local storage; Mnesia adds the database-like guarantees (transactions, replication, durability) on top, at the cost of some overhead you don't pay when using ETS directly.

What does Mnesia use under the hood for its actual storage engine?
What does Mnesia add on top of plain ETS?

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What is Mnesia? What is a Mnesia table? What are the storage types available for a Mnesia table? What is a Mnesia schema? How do you create a Mnesia schema? How do you create a Mnesia table? What is a Mnesia transaction? How do you write a record to a Mnesia table? How do you read a record from a Mnesia table? What are dirty operations in Mnesia? What is mnesia:dirty_read/1? What is a Mnesia record? How do you delete a record from a Mnesia table? What is the purpose of mnesia:start/0? How do you stop Mnesia? What are the Mnesia table types (set, ordered_set, bag)? What is a Mnesia index? How do you add a secondary index to a Mnesia table? What is mnesia:info/0 used for? How do you check if Mnesia is running? What is the Mnesia directory (Mnesia.dir)? What is the primary key in a Mnesia table? What is mnesia:select/2 used for? What is record_info used for when creating a Mnesia table? What are the attributes of a Mnesia table? What is a Mnesia node? How do you replicate a table across multiple Mnesia nodes? What is mnesia:table_info/2 used for? Describe the difference between a Mnesia table and an ETS table? Why should Mnesia operations generally run inside a transaction? When should you use dirty operations instead of a transaction? What is the difference between ram_copies and disc_copies? What is disc_only_copies and when would you use it? What happens to a disc_copies table when its node restarts? How do you change a table's storage type at runtime? What is a Mnesia table lock and how does it work? How does Mnesia keep replicated tables consistent across nodes? How do you migrate a Mnesia record definition when its fields change? What is mnesia:transform_table/3 used for? When should you choose bag over set for a Mnesia table? How do you back up a Mnesia database? How do you restore a Mnesia database from a backup? Explain the lifecycle of a Mnesia transaction from start to commit? How do you troubleshoot a Mnesia table stuck in the "loading" state? What is mnesia:force_load_table/1 and when should you use it? What is the difference between mnesia:read/1 and mnesia:wread/1? What is a Mnesia checkpoint used for? How does Mnesia resolve conflicts after a network partition heals?
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