Milvus provides an open-source vector database for generative AI and large collections of embeddings.
QuestDB
QuestDB provides an open-source time-series database with fast SQL queries for large workloads.
About QuestDB
QuestDB is an open-source time-series database that ingests ordered and out-of-order events and queries live and historical data with SQL. It transforms and aggregates events as they arrive, retains data across hot storage and object storage tiers, and allows access to the same data through Apache Parquet, Iceberg, and Arrow. It includes time-series SQL features such as SAMPLE BY downsampling and materialized views for aggregates such as OHLCV candles.
Key features
- Ingest ordered and out-of-order events without pre-aggregation
- Transform, enrich, and aggregate events as they arrive
- Query live and historical data with temporal SQL
- Retain data across hot storage and object storage tiers
- Access same data via Apache Parquet, Iceberg, and Arrow
- Create materialized views for OHLCV candles and aggregates
Best for: Teams in capital markets, aerospace, and energy working with large time-series workloads.
Good for
- Open-source database that uses standard SQL for time-series data
- Combines streaming ingestion, computation, and tiered storage in one engine
- Provides access to stored data through Parquet, Iceberg, and Arrow
QuestDB at a glance
- Website
- questdb.com
- Category
- AI & Machine Learning › AI SQL & Database Tools
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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QuestDB FAQ
Does QuestDB handle out-of-order events?
Yes, it ingests ordered and out-of-order events and includes deduplication and out-of-order correction.
Can I access QuestDB data in open formats?
Yes, the same data can be opened through Apache Parquet, Iceberg and Arrow.
How does QuestDB retain long-term history?
It keeps the record online across hot storage and object storage tiers.
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