rqlite

rqlite is a distributed system that provides a replicated SQLite database. rqlite is written in Go and uses Raft to achieve consensus across all the instances of the SQLite databases. rqlite ensures that every change made to the database is made to a majority of databases, or none-at-all.

Why replicate SQLite?

SQLite is a "self-contained, serverless, zero-configuration, transactional SQL database engine". The entire database is contained within a single file on disk, making working with it very straightforward. Many people have experience with it, and it's been a natural choice for adding relational-database functionality to many systems. However, SQLite isn't replicated, which means it can become a single point of failure if used to store metadata about cluster of manchines. While it is possible to continually copy the SQLite file to a backup server, this copy must not take place while the database is being accessed.

rqlite combines the ease-of-use of SQLite with straightfoward replication.

Writing Data

Querying Data

Performance

Depending on your machine, individual INSERT performance could be anything from 1 operation per second to more than 10 operations per second. However, by using transactions, throughput will increase significantly, often by 2 orders or magnitude. This speed-up is due to the way SQLite works.