Citus vs MongoDB vs RethinkDB

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What is Citus?

It's an extension to Postgres that distributes data and queries in a cluster of multiple machines. Its query engine parallelizes incoming SQL queries across these servers to enable human real-time (less than a second) responses on large datasets.

What is MongoDB?

MongoDB stores data in JSON-like documents that can vary in structure, offering a dynamic, flexible schema. MongoDB was also designed for high availability and scalability, with built-in replication and auto-sharding.

What is RethinkDB?

RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn.
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      What are some alternatives to Citus, MongoDB, and RethinkDB?
      Cockroach Labs is the company building CockroachDB, an open source, survivable, strongly consistent, scale-out SQL database.
      TimescaleDB: An open-source database built for analyzing time-series data with the power and convenience of SQL — on premise, at the edge, or in the cloud.
      The MySQL software delivers a very fast, multi-threaded, multi-user, and robust SQL (Structured Query Language) database server. MySQL Server is intended for mission-critical, heavy-load production systems as well as for embedding into mass-deployed software.
      PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions.
      Microsoft SQL Server
      Microsoft® SQL Server is a database management and analysis system for e-commerce, line-of-business, and data warehousing solutions.
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      Decisions about Citus, MongoDB, and RethinkDB
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      How developers use Citus, MongoDB, and RethinkDB
      Avatar of Tarun Singh
      Tarun Singh uses MongoDBMongoDB

      Used MongoDB as primary database. It holds trip data of NYC taxis for the year 2013. It is a huge dataset and it's primary feature is geo coordinates with pickup and drop off locations. Also used MongoDB's map reduce to process this large dataset for aggregation. This aggregated result was then used to show visualizations.

      Avatar of Trello
      Trello uses MongoDBMongoDB

      MongoDB fills our more traditional database needs. We knew we wanted Trello to be blisteringly fast. One of the coolest and most performance-obsessed teams we know is our next-door neighbor and sister company StackExchange. Talking to their dev lead David at lunch one day, I learned that even though they use SQL Server for data storage, they actually primarily store a lot of their data in a denormalized format for performance, and normalize only when they need to.

      Avatar of Foursquare
      Foursquare uses MongoDBMongoDB

      Nearly all of our backend storage is on MongoDB. This has also worked out pretty well. It's enabled us to scale up faster/easier than if we had rolled our own solution on top of PostgreSQL (which we were using previously). There have been a few roadbumps along the way, but the team at 10gen has been a big help with thing.

      Avatar of AngeloR
      AngeloR uses MongoDBMongoDB

      We are testing out MongoDB at the moment. Currently we are only using a small EC2 setup for a delayed job queue backed by agenda. If it works out well we might look to see where it could become a primary document storage engine for us.

      Avatar of Matt Welke
      Matt Welke uses MongoDBMongoDB

      Used for proofs of concept and personal projects with a document data model, especially with need for strong geographic queries. Often not chosen in long term apps due to chance data model can end up relational as needs develop.

      Avatar of Sine Wave Entertainment
      Sine Wave Entertainment uses RethinkDBRethinkDB

      High-speed update-aware storage used in our region server infrastructure; provides a good middle layer for storage of rapidly modified information.

      Avatar of Runbook
      Runbook uses RethinkDBRethinkDB

      Main database, using it in multiple datacenters in an active-active configuration.

      Avatar of Tobe O
      Tobe O uses RethinkDBRethinkDB

      Angel includes support for multiple databases, out-of-the-box.

      Avatar of Mike MacCana
      Mike MacCana uses RethinkDBRethinkDB

      As a boring document oriented database with safe defaults.

      Avatar of Domraider
      Domraider uses RethinkDBRethinkDB

      Sharded and replicated storage, NoSQL with joins

      How much does Citus cost?
      How much does MongoDB cost?
      How much does RethinkDB cost?
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