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Database Entry

Hydra

Abandoned Failed Company OLAP

Hydra is a data warehouse using PostgreSQL as its frontend and Citus' c-store extension for columnar storage.

Website
https://hydra.so[01]
Source Code
https://github.com/hydradatabase/columnar[02]
Tech Docs
https://docs.hydras.io[03]
Developer
Country of Origin
CA
Start Year
2022 [05]
End Year
2025 [06]
Project Types
Commercial, Open Source
Written in
C
Derived From
Citus, PostgreSQL
Operating Systems
Hosted, Linux
Licenses
AGPL v3, Apache v2
Twitter
@HydrasDB[04]

Database Entry

Hydra

Abandoned Failed Company OLAP

Hydra is a data warehouse using PostgreSQL as its frontend and Citus' c-store extension for columnar storage.

History

The system's source code repository has not been updated since 2025 and is now considered abandoned.

Data Model

Relational

Query Execution

Vectorized Model

Query Interface

SQL

Storage Architecture

Disk-oriented

Storage Model

Decomposition Storage Model (Columnar)

System Architecture

Shared-Everything
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Citations

6 sources
  1. https://hydra.so hydra.so Dead — Check Archive
  2. GitHub - hydradatabase/columnar: Postgres-native columnar storage extension · GitHub github.com
  3. https://docs.hydras.io hydras.io Dead — Check Archive
  4. https://twitter.com/HydrasDB twitter.com
  5. Add build script for Spilo image github.com
  6. Databases in 2025: A Year in Review // Blog // Andy Pavlo - Carnegie Mellon University cmu.edu
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