FerretDB is an open-source proxy that translates MongoDB wire protocol queries to SQL, with PostgreSQL as the database engine.
MongoDB was initially built as open-source software and it is a game-changer for many developers, enabling them to build fast and robust applications. Its ease of use and extensive documentation made it a top choice for many developers looking for an open-source database. However, all this changed when they switched to an SSPL license, moving away from their open-source roots.
FerretDB was founded to become the true open-source alternative to MongoDB, making it the go-to choice for most MongoDB users looking for an open-source alternative to MongoDB. With FerretDB, users can run the same MongoDB protocol queries without needing to learn a new language or command.
FerretDB is a document database that uses similar commands, drivers, and tools to those of MongoDB for storing data. Unlike relational databases, which use tables, rows, and columns to define the schema of the database, document databases use key-value pairs to build the structure of a document. In FerretDB, data is stored as <a href="https://bsonspec.org/spec.html" target="_blank" rel="noopener">BSON</a> - a binary representation of JSON - so you can store more types of data than in regular JSON.
Refer to <a href="https://docs.ferretdb.io/diff/" target="_blank" rel="noopener">known differences with MongoDB</a>
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FerretDB is an open-source proxy that translates MongoDB wire protocol queries to SQL, with PostgreSQL as the database engine.

FerretDB - A truly Open Source MongoDB alternative, built on Postgres

The Database Lab Engine is an open-source experimentation platform for PostgreSQL databases. Instantly create full-size clones of your production database and use them to test your database migrations, optimize SQL, or deploy full-size staging apps.
 
Thin cloning is possible due to <a href="https://en.wikipedia.org/wiki/Copy-on-write" target="_blank" rel="noopener noreferrer">copy-on-write</a>&nbsp;capabilities provided by either&nbsp;<a href="https://en.wikipedia.org/wiki/ZFS" target="_blank" rel="noopener noreferrer">ZFS filesystem</a>&nbsp;or&nbsp;<a href="https://en.wikipedia.org/wiki/Logical_Volume_Manager_(Linux)" target="_blank" rel="noopener noreferrer">LVM2</a>. As an example, cloning of 10 TiB PostgreSQL database takes less than 2 seconds when a single user is using the Database Lab Engine instance, and up to 30 seconds when 15 users are working with it at the same time.

The Database Lab Engine is an open-source experimentation platform for PostgreSQL databases. Instantly create full-size clones of your production database and use them to test your database migrations, optimize SQL, or deploy full-size staging apps.

Database Lab Engine - Thin database clones for faster development

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