Run MariaDB online

MariaDB is the community-maintained fork of MySQL; the wire protocol and SQL dialect are compatible with MySQL, so tutorials, drivers, and `mysql://` connection strings written for MySQL work here unchanged.

ls-judge runs MariaDB 11.4 LTS inside a Firecracker microVM. Every submission gets its own InnoDB instance seeded with a `playground` database (users + orders fixtures); writes vanish when the VM dies, so you can experiment without caution.

What you get in MariaDB

Clicking "Run now" opens the playground with this exact code and a matching test case pre-loaded — passes on first Run.

SELECT 'Hello, World!' AS greeting;

Common questions about MariaDB on ls-judge

MariaDB or MySQL?

MariaDB 11.4 LTS. Wire-protocol and SQL compatible with MySQL 8 for the overwhelming majority of queries. We may add a dedicated MySQL runtime if there is demand.

Pre-loaded data?

Yes — database `playground` with tables users(id, name, email) and orders(id, user_id, total, placed_at).

Storage engine?

InnoDB (default), with the buffer pool tuned small so the server fits in a 512 MB microVM.

Persistent DB?

No — the server is destroyed when the VM is torn down.

Free?

Yes.

• MariaDB documentation↗