Highly Available Reads with QuestDB

QuestDB is an open-source time-series database designed for high-performance and reliable workloads, offering features like ultra-low latency, high ingestion throughput, and a multi-tier storage engine, with native support for Parquet and SQL to ensure data portability and AI-readiness. QuestDB Enterprise enhances resilience by supporting built-in replication, allowing read traffic distribution across replicas to maintain query operations during node outages, which is critical for mission-critical or latency-sensitive applications. PostgreSQL-compatible clients, however, require configuration to handle failover, as they do not automatically adjust when a node goes down, which can be managed with infrastructure solutions like DNS failover or client-side multi-host connection strings. The document provides guidance on implementing high-availability reads using standard PostgreSQL clients and basic reconnect logic, illustrating examples in several programming languages including Python and Node.js. For testing purposes, users can simulate a replicated environment locally using Docker with QuestDB Open Source to observe client application failover behavior without affecting production systems.