# questdb
**Repository Path**: mao_cheng_lin/questdb
## Basic Information
- **Project Name**: questdb
- **Description**: QuestDB 是用于时间序列数据的高性能开源 SQL 数据库
- **Primary Language**: Java
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: https://www.oschina.net/p/questdb
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 10
- **Created**: 2021-07-25
- **Last Updated**: 2021-07-25
## Categories & Tags
**Categories**: Uncategorized
**Tags**: None
## README
English | [简体中文](./i18n/README.zh-cn.md)
# QuestDB
QuestDB is a high-performance, open-source SQL database for applications in
financial services, IoT, machine learning, DevOps and observability. It includes
endpoints for PostgreSQL wire protocol, high-throughput schema-agnostic
ingestion using InfluxDB Line Protocol, and a REST API for queries, bulk
imports, and exports.
QuestDB implements ANSI SQL with native extensions for time-oriented language
features. These extensions make it simple to correlate data from multiple
sources using relational and time series joins. QuestDB achieves high
performance from a column-oriented storage model, massively-parallelized vector
execution, SIMD instructions, and various low-latency techniques. The entire
codebase was built from the ground up in Java and C++, with no dependencies, and
is 100% free from garbage collection.
## Try QuestDB
We provide a [live demo](https://demo.questdb.io/) provisioned with the latest
QuestDB release and a 1.6 billion row dataset with 10 years of NYC taxi trips to
query.
To run QuestDB, Docker can be used to get started quickly:
```bash
docker run -p 9000:9000 -p 9009:9009 -p 8812:8812 questdb/questdb
```
macOS users can use Homebrew:
```bash
brew install questdb
brew services start questdb
```
The [QuestDB downloads page](https://questdb.io/get-questdb/) provides direct
downloads for binaries and has details for other installation and deployment
methods.
### Connecting to QuestDB
You can interact with QuestDB using the following interfaces:
- [Web Console](https://questdb.io/docs/reference/web-console/) listening on
port `9000`
- [REST API](https://questdb.io/docs/reference/api/rest/) on port `9000`
- [PostgreSQL](https://questdb.io/docs/reference/api/postgres/) wire protocol on
port `8812`
- [InfluxDB](https://questdb.io/docs/reference/api/influxdb/) line protocol for
high-throughput ingestion on port `9009`
## How QuestDB compares to other open source TSDBs
Here are high-cardinality
[Time Series Benchmark Suite](https://questdb.io/blog/2021/06/16/high-cardinality-time-series-data-performance/)
results using the `cpu-only` use case with 6 workers on an AMD Ryzen 3970X:
The following table shows query execution time of a billion rows run 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 in '2019'` | 0.05 secs |
## Documentation & resources
- The [QuestDB documentation](https://questdb.io/docs/introduction/) describes
how to run and configure QuestDB with technical references.
- [Our Slack workspace](https://slack.questdb.io) is a great place for technical
discussions and to meet other users. :wave:
- [GitHub discussions](https://github.com/questdb/questdb/discussions) is where
our users share ideas for features, ask questions, and show what they've built.
- [GitHub issues](https://github.com/questdb/questdb/issues) are for bug reports.
- [The project milestones](https://github.com/questdb/questdb/milestones) lists
the tasks and features we're working on for upcoming releases.
- [Tutorials](https://questdb.io/tutorial/) written by our community members
show what's possible with QuestDB.
- [QuestDB on Stack Overflow](https://stackoverflow.com/questions/tagged/questdb)
has common troubleshooting solutions.
## Contribute
We are always happy to have contributions to the project whether it is source
code, documentation, bug reports, feature requests or feedback. To get started
with contributing:
- Have a look through GitHub issues labeled
"[Good first issue](https://github.com/questdb/questdb/issues?q=is%3Aissue+is%3Aopen+label%3A%22Good+first+issue%22)".
- Read the
[contribution guide](https://github.com/questdb/questdb/blob/master/CONTRIBUTING.md).
- For details on building QuestDB, see the
[build instructions](https://github.com/questdb/questdb/blob/master/core/README.md).
- [Create a fork](https://docs.github.com/en/github/getting-started-with-github/fork-a-repo)
of QuestDB and submit a pull request with your proposed changes.
As a sign of our gratitude, we'll send contributors some of our QuestDB swag
such as stickers and t-shirts! :star2:
A big thanks goes to the following wonderful people who have contributed to
QuestDB: ([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!
