QuestDB – fast time series database, zero-GC Java
QuestDB is the open-source time-series database for demanding workloads: ultra-low latency, high throughput, tiered storage, and fast SQL on open formats.
QuestDB – fast time series database, zero-GC Java launched on November 29, 2019 with 22 votes, #732 of 3,203 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
In plain words
QuestDB is a time series database built with Java that emphasizes speed and zero garbage collection performance. It's designed for developers and organizations that need to process and analyze large volumes of time-stamped data efficiently. The database's architecture eliminates garbage collection pauses, which distinguishes it from typical Java applications and makes it suitable for high-performance analytical workloads where latency matters.
written from the facts on this page · September 2026
From the sources
Capture large volumes of market data and trades, act on them in real time, and query the same complete history for pre-trade signals, research, TCA, risk, P&L, surveillance, and compliance. Standard SQL and open formats keep every team connected to the record. Ingest ticks, orders, executions, and transactions at market speed. Durability, deduplication, and out-of-order correction are built in. Compute intraday risk and P&L, evaluate surveillance conditions, and publish results while the market is moving. Run TCA, markouts, post-trade analysis, compliance, and historical research in SQL, then open the same data through Apache Parquet, Iceberg and Arrow. Capture large volumes of market data…from questdb.io
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Query 1.6B rows in milliseconds, live2020 · try.questdb.io · ▲271QuestDB live demo. Query three large datasets and more than 2 billion rows in milliseconds with SQL
- QWQuestDB with Python, Pandas and SQL in a Jupyter notebook – no install2023 · play.questdb.io · ▲53
- EAEasyDB – A One-Click Ephemeral Database2019 · easydb.io · ▲158
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