Questdb

QuestDB is an open-source, high-performance time-series database designed for real-time analytics and demanding data workloads. It offers ultra-low latency queries and extremely high ingestion throughput, making it suitable for applications such as financial trading, observability and monitoring, industrial telemetry, IoT sensor data, and mission-critical operations. The database uses a columnar storage engine optimized for time-series data, with a multi-tier architecture that efficiently handles hot, warm, and cold data across memory and disk.

QuestDB supports standard SQL for querying, including time-series specific functions such as sampling, interpolation, windowing, and downsampling. This allows teams to use familiar query patterns while working with large volumes of time-stamped data. Native support for Apache Parquet enables seamless integration with data lakes, analytics platforms, and AI/ML workflows, ensuring data portability and avoiding vendor lock-in.