QuestDB
Apache-2.0 low-latency time-series database with SQL
Databases / Data · Apache-2.0 · 17.4k
Reviewed 2026-10-18 · last push 2026-10-19 · repo checked 2026-10-19
What's Good
Apache-2.0 (questdb/questdb), release 10.0.1 (2026-08-24), developed since 2014. Queries run across all cores with SIMD and JIT-compiled filters, storage is tiered (WAL, native columns, Parquet), and data stays open via Parquet, Iceberg and Arrow. It ingests over the InfluxDB line protocol and its own protocol, and speaks the Postgres wire protocol for queries. The project publishes ingestion benchmarks of 19M rows/sec per instance. ★~17.4k.
The Catch
Benchmarks are the vendor's own. Automatic tiering of cold partitions to object storage, replication and other features are in QuestDB Enterprise; in open source you convert partitions to Parquet yourself. It is built for append-heavy time-series, not general OLTP with frequent updates.
Verdict
One of the fastest open time-series databases — great for market data and telemetry.
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