Skip to content
Branch: master
Go to file


Failed to load latest commit information.

QuestDB Logo


All Contributors

What is QuestDB

QuestDB is an open-source database designed to make time-series lightning fast and easy.

It uses a column-oriented approach, vectorized execution, SIMD instructions, and a whole array of low-latency techniques. The whole code base is built from scratch, without dependencies, in the name of performance. We are 100% free from garbage collection.

QuestDB implements SQL, and augments it for time-series. It exposes a Postgres Wire protocol, a high-performance HTTP API, and even supports ingestion with Influx Line Protocol. It supports both relational and time-series joins, which makes it easy to correlate data over time. Writes are durably committed to disk, meaning that the data is safe, yet instantly accessible.

Performance figures

Raw figures

Number operations per second per thread. Writes are durable and written to disk.

Operation 64-bit double 32-bit int
Read 120 Million /s 240 Million /s
Write 240 Million /s 480 Million /s

On a CPU with 6 memory channels, QuestDB can scan through 117GB of data per second.


Execution time on a c5.metal instance using 16 of the 96 threads available.

Query Runtime
SELECT sum(double) FROM 1bn 0.061 secs
SELECT tag, sum(double) FROM 1bn 0.179 secs
SELECT tag, sum(double) FROM 1bn WHERE timestamp='2019' 0.05 secs

Getting Started

The easiest way to get started is with Docker:

docker pull questdb/questdb
docker run -p 9000:9000 -p 8812:8812 questdb/questdb

Alternative methods

Connecting to QuestDB

You can interact with QuestDB using:

Both the HTTP and PostgreSQL servers reference the database in <root_directory>/db.

You can connect to the Postgres server as follows. The default password is quest

psql -h localhost -p 8812 -U admin -W -d qdb

Building from source

(a) Prerequisites

  • Java 11 64-bit
  • Maven 3
  • Node.js 12 / NPM 6
java --version
mvn --version
node --version

(b) Clone the Repository

git clone

(c) Build the Code

cd questdb
mvn clean package -DskipTests

The build should take around 2 minutes. You can remove -DskipTests to run the 3000+ unit tests. The tests take 3-5 minutes to run.

(d) Run QuestDB

# Create a database root directory and run QuestDB
mkdir <root_directory>
java -p core/target/core-5.0.2-SNAPSHOT.jar -m io.questdb/io.questdb.ServerMain -d <root_directory>


Complete references are available in the Documentation. There are also several guides to get started.

Quick-start guides:

Usage guides:


Support / Contact

Slack Channel


Our roadmap is here


Feel free to contribute to the project by forking the repository and submitting pull requests. Please make sure you have read our contributing guide.


Thanks to these wonderful people (emoji key):


💻 🤔 📓


💻 📓 ⚠️


💻 📓




💻 🤔

This project follows the all-contributors specification. Contributions of any kind welcome!

You can’t perform that action at this time.