CHALLENGER
QuestDB
Single-node optimized · clustering/HA Enterprise-only · no multi-signal observability
GREPTIMEDB
GreptimeDB
Distributed, multi-signal observability on object storage
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QuestDB comparison at a glance.
See what changes operationally at scale.
QuestDB is a high-performance time-series database optimized for fast ingestion and SQL queries on a single node. Built in Java, C++, and Rust, it implements ANSI SQL with time-series extensions (SAMPLE BY, LATEST ON) and supports PostgreSQL wire protocol. Excels at single-node performance. Clustering and HA are available in the Enterprise edition only. Lacks multi-signal observability and native PromQL/OpenTelemetry support.
Feature comparison
| Feature/Aspect | GreptimeDB | QuestDB |
|---|---|---|
| Data Model | Metrics, Logs & Traces in one database | High-Performance Time-Series Database |
| Value Model | Multi-Value (supports complex data structures) | Multi-Value (columns with various data types) |
| Multi-model Support | Metrics, Logs & Traces in one database | Time-series data only |
| Query Languages | SQL & PromQL (dual interface) | SQL with time-series extensions (SAMPLE BY, LATEST ON) |
| Ingestion Protocols | SQL gRPC InfluxDB Line Protocol Prometheus Remote Storage OpenTelemetry Loki Push API Elasticsearch Bulk API HTTP API | InfluxDB Line Protocol PostgreSQL wire REST API CSV upload |
| Storage Format | Apache Parquet (columnar, compressed) | Custom columnar format with native compression |
| Data Retention | Flexible TTL policies with tiered storage | Partitioning and data lifecycle management |
| Continuous Aggregation | Built-in SQL aggregation, Pipeline ETL engine & Flow streaming computation | SQL aggregation functions with SAMPLE BY |
| Use Cases | Unified observability, real-time analytics, IoT monitoring, edge computing | Financial tick data, IoT sensors, real-time dashboards, trading systems |
| Architecture | Cloud-native distributed with compute-storage disaggregation | Single-node optimized (OSS); clustering available in Enterprise |
| Deployment Options | Single-node, cluster, Kubernetes-native, edge-to-cloud with unified API | Primarily single-node with enterprise clustering |
| Storage Scalability | Object storage integration with unlimited capacity | Vertical scaling (OSS); horizontal scaling Enterprise-only |
| High Availability | Native clustering with automatic failover | Enterprise-only (OSS is single-node, no built-in HA) |
| License | Apache 2.0 | Apache 2.0 |
| Operational Complexity | Single unified system with simplified Kubernetes operations | Simple single-node deployment, complex for clustering |
| Written Language | Rust (memory safety, performance) | Java, C++, Rust (performance hybrid) |
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