Why Self-Host a Distributed SQL Database?
Modern applications demand databases that scale horizontally while maintaining full ACID compliance and SQL compatibility. Traditional single-node databases hit a wall: vertical scaling gets expensive fast, read replicas introduce replication lag, and sharding manually is an operational nightmare. Distributed SQL databases solve this by combining the familiar relational model with the horizontal scalability of NoSQL systems.
Going self-hosted for your distributed SQL layer gives you complete control over data locality, eliminates vendor lock-in, and removes the steep per-core licensing costs that cloud-managed options impose. Whether you’re running a multi-region SaaS platform, a high-throughput e-commerce backend, or a real-time analytics pipeline, self-hosting a distributed SQL database puts the infrastructure back in your hands.
Key benefits of self-hosting:
- Full data sovereignty — data never leaves your infrastructure, critical for GDPR, HIPAA, and financial compliance
- Predictable costs — no per-vCPU or per-GB premiums; scale on your own hardware or cloud instances
- Custom topology — design your own replication strategies, placement policies, and failover behavior
- No vendor lock-in — all three databases discussed here are open-source and compatible with standard SQL
- Deep tuning access — adjust storage engines, compaction schedules, and memory pools to match your workload
In this guide, we compare the three most mature open-source distributed SQL databases available in 2026: CockroachDB, YugabyteDB, and TiDB. Each takes a different architectural approach to the same problem, and understanding those differences is crucial for making the right choice.
Architecture Comparison
The three databases differ fundamentally in how they distribute data, handle consensus, and process queries.
| Feature | CockroachDB | YugabyteDB | TiDB |
|---|---|---|---|
| License | BSL 1.1 (source-available) | Apache 2.0 | Apache 2.0 |
| Storage Engine | Pebble (RocksDB fork) | DocDB (RocksDB-based) | TiKV (Rust, MVCC) |
| Consensus Protocol | Multi-Raft (per-range) | Multi-Raft (per-shard/tablet) | Raft (per-region via PD) |
| SQL Layer | Built-in, PostgreSQL wire | Built-in, PostgreSQL wire | Separate layer (TiDB server) |
| API Compatibility | PostgreSQL | PostgreSQL + Redis + Cassandra | MySQL |
| Written In | Go | C++ (core) + Go (ysql/ybctl) | Go (SQL) + Rust (TiKV) |
| Sharding | Automatic, range-based | Automatic, tablet-based | Automatic, region-based |
| Transactions | Serializable (SI by default) | Serializable SI | Snapshot Isolation |
| HTAP Support | No (OLTP only) | Limited (colocated analytics) | Yes (TiFlash columnar) |
| Cluster Management | Built-in cockroach node | yb-master + yb-tserver | PD (Placement Driver) |
| Max Tested Cluster Size | 10,000+ nodes | 1,000+ nodes | 1,000+ nodes |
| Community Activity (GitHub) | ~30k stars, very active | ~8k stars, active | ~38k stars, very active |
CockroachDB
CockroachDB follows a shared-nothing, peer-to-peer architecture where every node runs the full stack: SQL processing, distributed transaction coordination, and key-value storage. Data is split into ranges (default 64 MB), each replicated across 3–5 nodes via a Raft group. The key innovation is per-range Raft — each range has its own independent consensus group, so a slow range doesn’t block the entire cluster.
The SQL layer is tightly coupled with the storage layer, which simplifies operations but means you can’t scale SQL compute independently from storage.
YugabyteDB
YugabyteDB uses a two-tier architecture: the yb-master tier handles metadata and cluster management, while yb-tserver nodes run both the storage engine (DocDB) and query services (YSQL for PostgreSQL, YCQL for Cassandra-compatible, and YEDIS for Redis-compatible APIs). Like CockroachDB, it uses per-shard Raft groups.
The major differentiator is DocDB, a document-oriented storage engine built on RocksDB that supports native JSON operations. YugabyteDB also offers the broadest API compatibility, supporting PostgreSQL, Cassandra, and Redis through a single deployment.
TiDB
TiDB has a decoupled architecture with three distinct components:
- TiDB — stateless SQL compute layer (MySQL-compatible)
- TiKV — distributed transactional key-value store (Raft-based)
- PD (Placement Driver) — metadata and scheduling service
This separation means you can scale compute (TiDB servers) and storage (TiKV nodes) independently. Add more TiDB servers when you need more query throughput without touching storage. Add more TiKV nodes when you need more capacity. This is the only database of the three with true compute-storage decoupling.
TiDB also supports HTAP (Hybrid Transactional/Analytical Processing) through TiFlash, a columnar storage replica that runs analytical queries without impacting transactional workloads.
Installation and Deployment
All three databases provide docker images and Kubernetes operators. Below are production-ready Docker Compose configurations for each.
CockroachDB — 3-Node Cluster
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Initialize the cluster and create a user:
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Access the admin UI at http://localhost:8081.
YugabyteDB — 3-Node Cluster
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Bootstrap the YSQL API and create your database:
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YugabyteDB also exposes Redis on port 6379 and Cassandra on port 9042 from the same cluster.
TiDB — 3-Node Cluster (TiDB + TiKV + PD)
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TiFlash configuration for HTAP:
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Start the cluster and initialize:
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Performance and Workload Characteristics
Each database excels at different workload patterns. Understanding these differences helps you match the tool to your use case.
Write-Heavy Workloads
CockroachDB and YugabyteDB both use per-range/per-shard Raft groups, which means write contention is localized. When multiple clients write to different key ranges, they proceed in parallel without blocking each other. However, writes to the same range will serialize through a single Raft leader.
TiKV’s Raft groups are larger (default 96 MB regions), which means fewer Raft groups overall but more data per group. The Rust-based implementation handles concurrent writes efficiently through async I/O and lock-free data structures.
For high write throughput with diverse key distribution:
- CockroachDB: ~50,000–100,000 writes/sec on a 3-node cluster (4 vCPU, 16 GB each)
- YugabyteDB: ~60,000–120,000 writes/sec (same hardware)
- TiDB: ~70,000–130,000 writes/sec (same hardware)
YugabyteDB and TiDB tend to edge out CockroachDB on raw write throughput because their storage engines are more heavily optimized for sequential write patterns.
Read-Heavy Workloads
All three databases support follower reads (reading from Raft followers instead of the leader), which reduces latency for geographically distributed reads.
- CockroachDB:
SELECT ... AS OF SYSTEM TIME FOLLOWER_READenables reading from the nearest replica with bounded staleness - YugabyteDB:
SET yb_read_from_followers = trueenables follower reads at the session level - TiDB: Stale reads via
SELECT ... FROM table_name AS OF TIMESTAMP ...provide similar functionality
TiDB has an advantage here because the stateless SQL layer can be scaled up independently — add more TiDB servers to handle read traffic without touching storage.
Mixed OLTP + Analytics (HTAP)
If you need both transactional and analytical queries on the same data:
TiDB is the clear winner with TiFlash, a real columnar storage engine that maintains a Raft-based replica of your data. Analytical queries are automatically routed to TiFlash without impacting transactional performance.
YugabyteDB offers colocated tables (small tables stored on a single tablet) which improve join performance but don’t provide columnar analytics.
CockroachDB is purely OLTP-focused. You would need to replicate data to a separate analytics system (like ClickHouse) for heavy analytical workloads.
Operational Considerations
Scaling
CockroachDB: Add nodes with cockroach start --join=<existing-nodes>. The cluster automatically rebalances ranges. No manual sharding or data migration needed.
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YugabyteDB: Add a new tserver and the masters will automatically assign tablets. Masters are added similarly with a new yb-master process.
TiDB: Scale compute by adding more TiDB server processes. Scale storage by adding more TiKV nodes. The PD service handles region scheduling automatically.
Backup and Restore
CockroachDB — full cluster backup:
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YugabyteDB — using yb-admin:
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TiDB — using BR (Backup & Restore tool):
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Monitoring
All three provide built-in dashboards:
- **CockroachDBprometheusUI at port 8080, Prgrafanas metrics at
/_status/vars, integrates with Grafana via official dashboards - YugabyteDB: Admin UI at port 7000 (masters) and 9000 (tservers), Prometheus-compatible
/metricsendpoint - TiDB: Dashboard via PD at port 2379 (access via browser at
http://pd-host:2379/dashboard), plus Grafana dashboards in the TiDB repository
License and Ecosystem
Licensing is the most practical differentiator for self-hosting:
CockroachDB uses the Business Source License (BSL 1.1), which is source-available but not open-source. You can freely use it internally, but you cannot offer CockroachDB as a managed database service to third parties. The license converts to Apache 2.0 after 3 years for each release. For most self-hosters, this is not a problem — but it matters if you’re building a product on top of it.
YugabyteDB uses Apache 2.0 for the core database. Fully open-source with no restrictions on commercial use or redistribution.
TiDB uses Apache 2.0 for all components (TiDB, TiKV, PD, TiFlash). Fully open-source with an active Chinese and global contributor base.
Ecosystem maturity:
CockroachDB has the longest track record (founded 2015), the most production deployments, and the deepest documentation. ORMs like SQLAlchemy, Django ORM, and Prisma work out of the box with PostgreSQL compatibility.
YugabyteDB has strong PostgreSQL compatibility (supports PostgreSQL 11 features) and the unique advantage of multi-API support. If you need both SQL and NoSQL (Cassandra/Redis) from the same cluster, this is the only option.
TiDB has the strongest MySQL compatibility, making it a drop-in replacement for MySQL applications that have outgrown a single server. The TiSpark integration also allows running Spark jobs directly against TiKV data.
Decision Guide: Which One to Choose?
| Your Situation | Recommendation |
|---|---|
| You want the most mature, battle-tested option with the best documentation | CockroachDB |
| You need full Apache 2.0 licensing with zero restrictions | YugabyteDB or TiDB |
| You’re migrating from PostgreSQL and want maximum compatibility | CockroachDB or YugabyteDB |
| You’re migrating from MySQL and want drop-in compatibility | TiDB |
| You need HTAP (mixed OLTP + analytics on the same data) | TiDB with TiFlash |
| You need multi-API (SQL + Cassandra + Redis from one cluster) | YugabyteDB |
| You want to scale compute independently from storage | TiDB |
| You need the smallest resource footprint for a homelab | TiDB (TiKV is Rust, very efficient) |
| You want Kubernetes-native deployment with an operator | All three have operators; TiDB’s is the most mature |
| You’re building a multi-region SaaS with strict compliance | CockroachDB (best geo-partitioning) or YugabyteDB |
For most teams starting their distributed SQL journey in 2026, CockroachDB offers the smoothest onboarding experience and the most comprehensive feature set for OLTP workloads. TiDB is the best choice if you’re coming from MySQL or need HTAP capabilities. YugabyteDB shines when you need maximum API flexibility and want a fully permissive open-source license without any BSL concerns.
All three databases can handle production traffic with proper configuration. The key is to start with a 3-node cluster, monitor your workload patterns, and scale based on actual metrics rather than theoretical capacity.
Frequently Asked Questions (FAQ)
Which one should I choose in 2026?
The best choice depends on your specific requirements:
- For beginners: Start with the simplest option that covers your core use case
- For production: Choose the solution with the most active community and documentation
- For teams: Look for collaboration features and user management
- For privacy: Prefer fully open-source, self-hosted options with no telemetry
Refer to the comparison table above for detailed feature breakdowns.
Can I migrate between these tools?
Most tools support data import/export. Always:
- Backup your current data
- Test the migration on a staging environment
- Check official migration guides in the documentation
Are there free versions available?
All tools in this guide offer free, open-source editions. Some also provide paid plans with additional features, priority support, or managed hosting.
How do I get started?
- Review the comparison table to identify your requirements
- Visit the official documentation (links provided above)
- Start with a Docker Compose setup for easy testing
- Join the community forums for troubleshooting