# hydra_test

**Repository Path**: ChinaPoppy/hydra_test

## Basic Information

- **Project Name**: hydra_test
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2024-01-31
- **Last Updated**: 2024-01-31

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

[![Hydra - the open source data warehouse](https://raw.githubusercontent.com/hydradatabase/hydra/main/.images/header.png)](https://hydra.so)

# 🐘🤘 Hydra

**Hydra is open source, column-oriented Postgres. You can query billions of rows instantly on Postgres without code changes. Parallelized analytics in minutes, not weeks.**

## 🚀 Quick start

Try the [Hydra Free Tier](https://dashboard.hydra.so/signup) to create a column-oriented Postgres instance. Then connect to it with your preferred Postgres client (psql, dbeaver, etc).

Alternatively, you can run Hydra [locally](#run-locally).

## 💪 Benchmarks - fastest Postgres aggregates on earth

Benchmarks were run on a c6a.4xlarge (16 vCPU, 32 GB RAM) with 500 GB of GP2 storage.
Results in seconds, smaller is better.

![Hydra - the open source data warehouse](https://raw.githubusercontent.com/hydradatabase/hydra/main/.images/ReadmeBenchmarks.png)

[Review Clickbench](https://tinyurl.com/clickbench) for comprehensive results and the list of 42 queries tested.

This benchmark represents typical workload in the following areas: clickstream and traffic analysis, web analytics, machine-generated data, structured logs, and events data.

![Hydra - the open source data warehouse](https://raw.githubusercontent.com/hydradatabase/hydra/main/.images/FasterthanPG.png)

### For our continuous benchmark results, see [BENCHMARKS](https://github.com/hydradatabase/hydra/blob/main/BENCHMARKS.md).

## 🙋 FAQs

View complete answers in [our documentation](https://docs.hydra.so/concepts/faqs).

### Q: Why is Hydra so fast?

A: Columnar storage, query parallelization, vectorized execution, column-level caching, and tuning Postgres.

### Q: How do I start using the columnar format on Postgres?

A: Data is loaded into columnar format by default. Use Postgres normally.

### Q: What operations is Hydra meant for? Provide examples.

A: Aggregates (COUNT, SUM, AVG), WHERE clauses, bulk INSERTS, UPDATE, DELETE…

### Q: What is columnar not meant for?

A: Frequent large updates, small transactions…

### Q: What Postgres features are unsupported on columnar?

* Logical replication.
* Columnar tables don’t typically use indexes, only supporting btree and hash indexes, and their associated constraints.

### Q: Is Hydra a fork?

A: Hydra is a Postgres extension, not a fork. Hydra makes use of `tableam` (table access method API), which was added in Postgres 12 released in 2019.

## 🤝 Community and Status

- [x] Alpha: Limited to select design partners
- [x] Public Alpha: available for use, but with noted frictions
- [x] Hydra 1.0 beta: Stable for non-enterprise use cases
- [x] Hydra 1.0 Release: Generally Available (GA) and ready for production use

## :technologist: Developer resources

- [CHANGELOG](https://github.com/hydradatabase/hydra/blob/main/CHANGELOG.md) for details of recent changes
- [GitHub Issues](https://github.com/hydradatabase/hydra/issues) for bugs and missing features
- [Discord](https://hydra.so/discord) discussion with the Community and Hydra team
- [Docs](https://docs.hydra.so/) for Hydra features and warehouse ops

## 💻 Run locally

The Hydra [Docker image](https://github.com/hydradatabase/hydra/pkgs/container/hydra) is a drop-in replacement for [postgres Docker image](https://hub.docker.com/_/postgres).

You can try out Hydra locally using [docker-compose](https://docs.docker.com/compose/).

```bash
git clone https://github.com/hydradatabase/hydra && cd hydra
cp .env.example .env
docker compose up
psql postgres://postgres:hydra@127.0.0.1:5432
```

## 📝 License

Hydra is only possible by building on the shoulders of giants.

The code in this repo is licensed under:

- [AGPL 3.0](https://github.com/hydradatabase/hydra/tree/main/columnar/LICENSE) for [Hydra Columnar](https://github.com/hydradatabase/hydra/tree/main/columnar)
- All other code is [Apache 2.0](https://github.com/hydradatabase/hydra/blob/main/LICENSE)

The docker image is built on the [Postgres docker image](https://hub.docker.com/_/postgres/), which contains a large number of open source projects, including:

- Postgres - [the Postgres license](https://www.postgresql.org/about/licence/)
- Debian or Alpine Linux image, depending on the image used
- Hydra includes the following additional software in the image:
    - multicorn - BSD license
    - mysql_fdw - MIT-style license
    - parquet_s3_fdw - MIT-style license
    - pgsql-http - MIT license

As for any pre-built image usage, it is the image user's responsibility to ensure that any use of this image complies with any relevant licenses for all software contained within.