[](#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**.
### Queries
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:
```shell script
docker run -p 9000:9000 -p 8812:8812 questdb/questdb
```
You can more information about Docker usage
[here](https://hub.docker.com/repository/docker/questdb/questdb/).
#### Alternative methods
- [Start with Homebrew](https://questdb.io/docs/guideHomebrew)
- [Start with the binaries](https://questdb.io/docs/guideBinaries)
### Connecting to QuestDB
You can interact with QuestDB using:
- [Web Console](https://questdb.io/docs/usingWebConsole) listening on port
`9000`: [localhost:9000](http://localhost:9000)
- [Postgres Wire](https://questdb.io/docs/guidePSQL), for example with PSQL
(alpha) on port `8812`
- [HTTP API](https://questdb.io/docs/guideREST) listening on port `9000`
Both the HTTP and PostgreSQL servers reference the database in
`/db`.
You can connect to the Postgres server as follows. The default password is
`quest`
```shell script
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
```shell script
java --version
mvn --version
node --version
```
#### (b) Clone the Repository
```shell script
git clone git@github.com:questdb/questdb.git
```
#### (c) Build the Code
```shell script
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
```shell script
# Create a database root directory and run QuestDB
mkdir
java -p core/target/core-5.0.2-SNAPSHOT.jar -m io.questdb/io.questdb.ServerMain -d
```
## Resources
Complete references are available in the
[Documentation](https://questdb.io/docs/documentationOverview). There are also
several guides to get started.
Quick-start guides:
- [Docker](https://questdb.io/docs/guideDocker)
- [Homebrew](https://questdb.io/docs/guideHomebrew)
- [Using the binaries](https://questdb.io/docs/guideBinaries)
Usage guides:
- [Web Console](https://questdb.io/docs/usingWebConsole)
- [Postgres Wire with PSQL](https://questdb.io/docs/guidePSQL) (alpha)
- [REST API](https://questdb.io/docs/guideREST)
- [CRUD operations](https://questdb.io/docs/crudOperations)
Concepts:
- [SQL extensions](https://questdb.io/docs/sqlExtensions)
- [Storage model](https://questdb.io/docs/storageModel)
- [Partitions](https://questdb.io/docs/partitions)
- [Designated timestamp](https://questdb.io/docs/designatedTimestamp)
## Support / Contact
[Slack Channel](https://join.slack.com/t/questdb/shared_invite/enQtNzk4Nzg4Mjc2MTE2LTEzZThjMzliMjUzMTBmYzVjYWNmM2UyNWJmNDdkMDYyZmE0ZDliZTQxN2EzNzk5MDE3Zjc1ZmJiZmFiZTIwMGY)
## Roadmap
[Our roadmap is here](https://github.com/questdb/questdb/projects/3)
## Contribution
Feel free to contribute to the project by forking the repository and submitting
pull requests. Please make sure you have read our
[contributing guide](https://github.com/questdb/questdb/blob/master/CONTRIBUTING.md).
## Contributors ✨
Thanks to these wonderful people
([emoji key](https://allcontributors.org/docs/en/emoji-key)):
This project follows the
[all-contributors](https://github.com/all-contributors/all-contributors)
specification. Contributions of any kind welcome!
