dbmate vs pt-online-schema-change

dbmate is a free, open-source command-line tool for keeping database schemas in sync across developers and production servers. It works independently of application language and can be used with Go, Node.js, Python, Ruby, PHP, Rust, C++, and other languages or frameworks. Migrations are plain SQL in timestamp-versioned files. Commands create, apply, and roll back migrations, check status, dump or load a schema, and wait for a database server. The project lists MySQL, MariaDB, PostgreSQL, SQLite, and ClickHouse, and documents BigQuery connections and Spanner support for databases using the PostgreSQL dialect. Migrations run atomically in a transaction by default when the database supports transactions, though individual migration blocks can opt out. dbmate can maintain a schema.sql dump for source-control review and Git diffs; creating dumps relies on database client tools such as pg_dump, mysqldump, or sqlite3. It reads DATABASE_URL by default and can load environment variables from a .env file. Installation options include NPM, Homebrew, Scoop, a Linux binary, and Docker images. Go applications can use it as a library, and Go embed can package migrations into an application binary.

pt-online-schema-change has no write-up on Specifiction yet; its figures are above.