# questdb/questdb

QuestDB is a high performance, open-source, time-series database

Repository: https://github.com/questdb/questdb
Canonical: https://ross.abutalabs.com/products/questdb
Homepage: https://questdb.com
Language: Java
License: Apache-2.0
License Family: permissive
Topics: time-series, low-latency, database, sql, grafana, simd, questdb, tsdb, java, postgresql, cpp, time-series-database, financial-analysis, capital-markets, market-data, olap, real-time-analytics, tick-data, kdb, parquet
Last push: 2026-08-26T23:51:25+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 99, longevity 100
- inputs: {"age_days": 4510, "days_push": 7, "days_rel": 9, "gap_med": 17.5, "n_releases_24m": 33}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 17279, forks 1639 (observed 2026-08-28T04:11:17.906914+00:00)

## What it is
QuestDB is an open-source, high-performance time-series database with a column-oriented, SIMD-vectorized SQL engine written in zero-GC Java and C++. It offers multi-tier storage (WAL, native columnar, Parquet on object storage), Postgres wire protocol, REST API, and time-series SQL extensions like ASOF JOIN and SAMPLE BY.

## Use cases
- store and query financial tick data like trades and order books
- ingest millions of sensor or IoT telemetry events per second
- build real-time dashboards and monitoring with Grafana
- run low-latency analytical SQL queries on time-series data
- compute OHLC bars and technical indicators on market data
- analyze post-trade execution quality and slippage
- keep historical data in Parquet on object storage without vendor lock-in

## When to choose
- you need high-throughput ingestion with millisecond-level SQL query latency
- your workload is time-series heavy with high data cardinality
- you want Postgres wire compatibility and open formats like Parquet
- you need time-series SQL operators like ASOF JOIN, SAMPLE BY, and LATEST ON
- you want a self-hosted database that integrates with Grafana and existing SQL tooling

## When to avoid
- you need full OLTP with complex multi-row transactions and joins across relational entities
- your data is mostly unstructured documents or graph-shaped
- you require ARM-optimized performance, since SIMD and JIT optimizations are limited on ARM
- you need high availability, RBAC, and automated backups without paying for QuestDB Enterprise
- you want a fully managed cloud database with no operational overhead

## Facets
- artifact type: service
- maturity: stable
- function: database, search-engine, analytics, streaming, monitoring
- domain: databases, time-series, fintech, analytics, big-data
- platform: windows, self-hosted, cloud, jvm, cpp, rust
- tags: time-series-database, sql, simd, columnar, parquet, postgres-wire-protocol, low-latency, tick-data, olap, grafana, financial-market-data, telemetry, asof-join, sample-by, real-time, linux, macos, docker, kubernetes

## Member repositories
- questdb/questdb (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:17.906914+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 2026-08-29T17:03:26.121203+00:00, confidence not recorded.
  - readme: https://github.com/questdb/questdb (fetched 2026-08-28T04:11:17.906914+00:00, sha 6ee6b772bb57)
  - homepage: https://questdb.com (fetched 2026-08-29T08:01:25.493179+00:00, sha 057e7697aecc)
  - site_page: https://questdb.com/docs/deployment/kubernetes (fetched 2026-08-29T08:01:25.508846+00:00, sha 026579af00b0)
  - site_page: https://questdb.com/docs/deployment/aws (fetched 2026-08-29T08:01:25.510644+00:00, sha 2266d95f00da)
  - site_page: https://questdb.com/docs (fetched 2026-08-29T08:01:25.502912+00:00, sha 24f9838e82b3)
  - site_page: https://questdb.com/docs/cookbook (fetched 2026-08-29T08:01:25.504709+00:00, sha 0053966aee2c)
  - site_page: https://questdb.com/docs/deployment/docker (fetched 2026-08-29T08:01:25.506531+00:00, sha 18b9faab782b)
  - site_page: https://questdb.com/docs/deployment/azure (fetched 2026-08-29T08:01:25.512726+00:00, sha 0d9a5bdb0cc1)
  - site_page: https://questdb.com/docs/deployment/gcp (fetched 2026-08-29T08:01:25.514475+00:00, sha cb8ae697d198)
  - site_page: https://questdb.com/docs/architecture/storage-engine (fetched 2026-08-29T08:01:25.516351+00:00, sha 95caf07077df)
- Data as of 2026-08-30T08:39:29.467469+00:00.