QuestDB

QuestDB is a high-performance, open-source time-series database designed for demanding workloads in finance, IoT, and observability. It serves as an open-source alternative to Kdb+, offering ultra-low latency, high ingestion throughput, and native SQL support for efficient time-series data management.

Key features include:

• Ultra-Low Latency: Engineered for real-time analytics and high-frequency data processing.
• SQL Compatibility: Supports standard SQL with time-series extensions for easy querying and analysis.
• Open Formats: Native support for open formats like Parquet, enabling data portability and vendor lock-in avoidance.
• High Ingestion Throughput: Capable of ingesting millions of data points per second per node.
• Multi-Tier Storage Engine: Optimizes storage costs and performance by tiering data based on access frequency.
• ASOF JOIN: Efficiently merges time-series data, even when timestamps do not exactly match.

Use cases include:

• Financial Markets: Powering trading platforms, risk management systems, and market data analytics.
• IoT: Handling sensor data for real-time monitoring and control.
• Observability: Analyzing logs and metrics for application performance monitoring and troubleshooting.