# JetBrains/xodus

Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.

Repository: https://github.com/JetBrains/xodus
Canonical: https://ross.abutalabs.com/products/jetbrains-xodus
Language: Java
License: Apache-2.0
License Family: permissive
Topics: embedded-database, java, kotlin, key-value, entity-store, transactional, log-structured, schema-less, snapshot-isolation, nosql, xodus, db, database, youtrack
Last push: 2026-07-09T12:00:26+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 91, release rhythm 8, longevity 100
- inputs: {"age_days": 4509, "days_push": 55, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1261, forks 116 (observed 2026-08-28T04:04:10.122176+00:00)

## What it is
JetBrains Xodus is a transactional, schema-less embedded database written in Java and Kotlin, offering ACID transactions with MVCC and snapshot isolation. It powers JetBrains YouTrack and Hub and provides both key-value (Environments) and entity-store APIs.

## Use cases
- embed an ACID database in a JVM application
- schema-less key-value storage with no administration
- highly concurrent non-blocking reads via MVCC
- store entities without schema migrations
- embedded persistence for issue tracking or user management tools

## When to choose
- you need an embedded, zero-administration database inside a Java/Kotlin app
- you want fully ACID transactions with non-blocking snapshot-isolated reads
- your data model changes often and you want to avoid schema migrations

## When to avoid
- you are starting a new project - the project is in sunset stage in favor of YouTrackDB
- you need a client-server or networked database
- you need rich query languages, joins, or SQL support

## Facets
- artifact type: library
- maturity: maintenance
- function: database, orm
- domain: databases, developer-tools
- platform: jvm, cross-platform
- tags: embedded-database, key-value-store, mvcc, snapshot-isolation, schema-less, nosql, log-structured, entity-store, kotlin

## Member repositories
- JetBrains/xodus (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:10.122176+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T05:04:16.637236+00:00, confidence not recorded.
  - readme: https://github.com/JetBrains/xodus (fetched 2026-08-28T04:04:10.122176+00:00, sha 02c781425a93)
- Data as of 2026-08-30T08:39:29.467469+00:00.