Postgres-XL

Postgres-XL is a massively parallel database built on top of, and very closely compatible with PostgreSQL 9.5. It is different because it supports both Business Intelligence workloads and high-volume transactional write and read workloads all on the same platform. 

Postgres-XL is designed to be horizontally scalable and flexible enough to handle various workloads including: 

  • OLTP write-intensive workloads
  • Business Intelligence requiring OLAP with MPP parallelism
  • Operational data store
  • Key-value store including JSON
  • GIS Geospatial
  • Mixed-workload environments

Availability

Postgres-XL 9.5

(Postgres-XL 9.5 R1.5 Released - April 20, 2017)

You can download Postgres-XL here and go through the release notes  here

Please report all issues to [email protected].

Postgres-XL 9.6

Postgres-XL 9.6 Alpha source code is now available here

2ndQuadrant is in the process of stabilizing this code base and would welcome contributions in the form of patches, documentation and testing. Please send an email to [email protected] if you want to help. 

Please report all issues to  [email protected]

IMPORTANT: This is not a production release and should not be used in any production environment. 2ndQuadrant is not liable for any loss of data or corruption of any sort.

Performance

Our internal testing for BI workloads reveals a dramatic boost in performance compared to native PostgreSQL. Results on a 16 node cluster show linear scalability for most queries. 

Features

Some of the most prominent features of Postgres-XL are listed below: 

  • Scalable - partition or replicate tables across multiple nodes
  • Fully ACID compliant including MVCC
  • Open Source
  • Cluster-wide consistency ensured by Global Transaction Monitor
  • Based on PostgreSQL 9.5, fully utilizing new BI features
  • Compatible with all PostgreSQL drivers, including JDBC, ODBC, OLE DB, Python, Ruby, perl DBI, Tcl, and Erlang.
  • CREATE TABLE syntax compatibility with Greenplum and Redshift

Core Enhancements

In order to perform as well as XL does, a number of core enhancements were made and are described below. 

Massively Parallel Processing (MPP)

  • Multi-node distributed Parallel Query - Allows SQL queries to be executed up to N times faster on N datanodes, spreading both CPU and I/O utilization evenly across a cluster.
  • Three stage Aggregation - Parallelizes aggregate queries to minimize distributed data logistics.
  • Dynamic Redistribution of data for complex SQL queries - Automatically re-arrange data to allow complex SQL queries, not just simple Star Schema queries or Map/Reduce-style tasks.
  • Cooperative Scans - Queries work together to avoid repeated re-scanning of same data

Distributed Transaction Processing (OLTP)

  • Distributed Global Consistency - Database appears to be a single consistent database to users.
  • Write Scalability, as well as Read Scalability - Scale OLTP writes across the nodes

Extensibility & Scalability

  • Linear scalability - Performance increases linearly for many typical operations for both OLTP and Parallel Query
  • Extensible  - Cluster can be extended to increase processing power
  • Very Large Database Support - Cluster easily supports 10s of TBs

High Availability

  • High Availability - Physically replicated data nodes to ensure High Availability
  • Disaster Recovery - Disaster Recovery via Streaming Replication

Platform Testing & Support

  • XL is tested on Linux and Mac OS X.

History

Postgres-XL has been evolving over many years, originating with the GridSQL project and PostgresXC, later combined as TransLattice Storm (StormDB). TransLattice open sourced the project, resulting in Postgres-XL 9.2. More recently, the EU-funded Big Data project AXLE funded the main work to bring the code up to date as Postgres-XL 9.5, allowing XL to take advantage of the rapidly increasing BI features plugged into the core of PostgreSQL. 

Support for Postgres-XL

Postgres-XL is open source and fully supported for 2ndQuadrant Support customers. We also offer consulting services to help organisations with application development, cluster design, deployment, feature development and performance analysis.

Need more help?

Want to know more? Need some help to set up XL? As active community developers for the project, we're probably the best people in the world to help you get up and running with Postgres-XL. We have consultants available to provide assistance, plus our unique 24/7 Production Support subscription service also covers Postgres-XL.   


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