Three Ways to Get Citus

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Open Source

The Citus extension to Postgres is available as open source. And as of Citus 10, the Citus shard rebalancer is now open source, too.

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Citus on

Citus is available in the cloud as Hyperscale (Citus), a built-in option in the Azure Database for PostgreSQL managed service.

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Citus in
Azure Arc

In preview. Deploy Hyperscale (Citus) to on-prem, multicloud, & edge environments—with Kubernetes & infra of your choice.

Why Citus?

  • Distributed Scale

    Scale out Postgres by distributing your data & queries across a cluster. And it’s simple to add nodes & rebalance shards when you need to grow.

  • Simplified Architecture

    Reduce your infrastructure headaches by using a single database for both your transactional and analytical workloads.

  • Parallelized Performance

    Speed up queries by 20x to 300x (or more) through parallelism, keeping more data in memory, higher I/O bandwidth, and columnar compression.

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    Open Source

    Download and use Citus open source for free. You can manage Citus yourself, embrace open source, and help us improve Citus via GitHub.

  • Postgres elephant outline icon
    Power of Postgres

    Citus is an extension (not a fork) to the latest Postgres versions, so you can use your familiar SQL toolset & leverage your Postgres expertise.

  • managed database service cloud icon
    Managed Database Service

    Focus on your application and forget about your database. Run Citus in the cloud as a built-in option on Azure Database for PostgreSQL.

See How Citus Shards Postgres


All queries to a Citus cluster are managed by the Citus coordinator, which looks like single-node Postgres to your application—modulo the performance benefits of scaling out. The Citus coordinator transforms SQL queries & routes the transformed queries to the correct shards on the workers. In this animation, the co-located join and update scenarios are single-tenant queries that only query a subset of shards and worker nodes. Whereas the distributed aggregate and distributed transaction scenarios access shards across multiple nodes.

Why Scale Out Postgres? Performance.

Side-By-Side Performance Comparison

YouTube video still: High performance PostgreSQL with Postgres & Hyperscale (Citus)

Watch this demo to see how Citus gives this application ~20X faster transactions and 300X – 150,000X faster analytics queries.

What’s New in Citus 10?

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Citus now includes columnar compression. Use both columnar & row tables—on a single node, or across a Citus cluster.

Read the post  |  Watch demo

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Use Citus to shard on a single node when you plan to grow in the future. Also handy for trying out Citus.

Read the post

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Open source shard rebalancer

The shard rebalancer is super useful for rebalancing your cluster & is now open source.

Read the post

Citus 10.1 is out. Read all about the latest Citus 10.1 release!

Capabilities of Distributed Postgres With Citus

Is Citus Right For You?

Not every application benefits from distributing Postgres, parallelizing queries, compressing tables via columnar, and the ability to scale from a single node to a distributed database cluster. But many do. Some popular Citus use cases: multi-tenant SaaS applications, real-time analytics, & time series.

Citus workloads Venn diagram
When Not to Use Citus—because not all workloads need Postgres at any scale
  • If you do not expect your app to grow & Postgres on a single node supports your app just fine.
  • If you only need offline analytics & do not need real-time ingest nor real-time queries.
  • If your app does not need to support a large number of concurrent users.
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Scale Out Your Database Without Giving Up Postgres

  • Citus is a PostgreSQL extension and not a fork, in sync with all the latest releases.
  • Leverage your PostgreSQL expertise and all the tools in the Postgres ecosystem.
  • Take advantage of all the innovations in Postgres—including rich data types and extensions like JSONB, PostGIS, HyperLogLog, pg_stat_statements, and full text search.
  • Scale out your database without giving up SQL. You don’t get joins from NoSQL databases. And application-level sharding solutions will not give you joins when you need them.
  • At Citus, we make sharding simple. We’ve done the distributed systems engineering to scale out Postgres without losing the things that make Postgres great. So you can scale out without sacrifice.