jchampio / timescaledb

An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.

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TimescaleDB

TimescaleDB is an open-source database designed to make SQL scalable for time-series data. It is engineered up from PostgreSQL and packaged as a PostgreSQL extension, providing automatic partitioning across time and space (partitioning key), as well as full SQL support.

If you prefer not to install or administer your instance of TimescaleDB, hosted versions of TimescaleDB are available in the cloud of your choice (pay-as-you-go, with a free trial to start).

To determine which option is best for you, see Timescale Products for more information about our Apache-2 version, TimescaleDB Community (self-hosted), and Timescale Cloud (hosted), including: feature comparisons, FAQ, documentation, and support.

Below is an introduction to TimescaleDB. For more information, please check out these other resources:

• Developer Documentation
• Slack Channel
• Timescale Release Notes & Future Plans

For reference and clarity, all code files in this repository reference licensing in their header (either the Apache-2-open-source license or Timescale License (TSL) ). Apache-2 licensed binaries can be built by passing -DAPACHE_ONLY=1 to bootstrap.

Contributors welcome.

(To build TimescaleDB from source, see instructions in Building from source.)

Using TimescaleDB

TimescaleDB scales PostgreSQL for time-series data via automatic partitioning across time and space (partitioning key), yet retains the standard PostgreSQL interface.

In other words, TimescaleDB exposes what look like regular tables, but are actually only an abstraction (or a virtual view) of many individual tables comprising the actual data. This single-table view, which we call a hypertable, is comprised of many chunks, which are created by partitioning the hypertable's data in either one or two dimensions: by a time interval, and by an (optional) "partition key" such as device id, location, user id, etc. (Architecture discussion)

Virtually all user interactions with TimescaleDB are with hypertables. Creating tables and indexes, altering tables, inserting data, selecting data, etc., can (and should) all be executed on the hypertable.

From the perspective of both use and management, TimescaleDB just looks and feels like PostgreSQL, and can be managed and queried as such.

Before you start

PostgreSQL's out-of-the-box settings are typically too conservative for modern servers and TimescaleDB. You should make sure your postgresql.conf settings are tuned, either by using timescaledb-tune or doing it manually.

Creating a hypertable

-- Do not forget to create timescaledb extension
CREATE EXTENSION timescaledb;

-- We start by creating a regular SQL table
CREATE TABLE conditions (
  time        TIMESTAMPTZ       NOT NULL,
  location    TEXT              NOT NULL,
  temperature DOUBLE PRECISION  NULL,
  humidity    DOUBLE PRECISION  NULL
);

-- Then we convert it into a hypertable that is partitioned by time
SELECT create_hypertable('conditions', 'time');

• Quick start: Creating hypertables
• Reference examples

Inserting and querying data

Inserting data into the hypertable is done via normal SQL commands:

INSERT INTO conditions(time, location, temperature, humidity)
  VALUES (NOW(), 'office', 70.0, 50.0);

SELECT * FROM conditions ORDER BY time DESC LIMIT 100;

SELECT time_bucket('15 minutes', time) AS fifteen_min,
    location, COUNT(*),
    MAX(temperature) AS max_temp,
    MAX(humidity) AS max_hum
  FROM conditions
  WHERE time > NOW() - interval '3 hours'
  GROUP BY fifteen_min, location
  ORDER BY fifteen_min DESC, max_temp DESC;

In addition, TimescaleDB includes additional functions for time-series analysis that are not present in vanilla PostgreSQL. (For example, the time_bucket function above.)

• Quick start: Basic operations
• Reference examples
• TimescaleDB API

Installation

TimescaleDB is available pre-packaged for several platforms:

• Linux:
  • RedHat / CentOS
  • Ubuntu
  • Debian
• Docker
• MacOS (Homebrew)
• Windows

Timescale Cloud (cloud-hosted and managed TimescaleDB) is available via free trial. You create database instances in the cloud of your choice and use TimescaleDB to power your queries, automating common operational tasks and reducing management overhead.

We recommend following our detailed installation instructions.

To build from source, see instructions here.

Resources

Useful tools

• timescaledb-tune: Helps set your PostgreSQL configuration settings based on your system's resources.
• timescaledb-parallel-copy: Parallelize your initial bulk loading by using PostgreSQL's COPY across multiple workers.

Additional documentation

• Why use TimescaleDB?
• Migrating from PostgreSQL
• Writing data
• Querying and data analytics
• Tutorials and sample data

Community & help

• Slack Channel
• Github Issues
• Timescale Support: see support options (community & subscription)

Releases & updates

• Timescale Release Notes & Future Plans: see planned and in-progress updates and detailed information about current and past releases.
• Subscribe to Timescale Release Notes to get notified about new releases, fixes, and early access/beta programs.

Contributing

• Contributor instructions
• Code style guide