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DBLE

opensource.actionsky.com

Free plan LinuxSelf-hosted
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Spec score 7.8 #7 of 31 in Database Proxy Software

What it is

DBLE is free, open-source middleware for scaling MySQL through sharding. It uses the MySQL protocol and can replace MySQL in many cases without application code changes. Teams can configure hash, modulo, time-based, range-based, or custom sharding, along with global and ER tables. DBLE lists query routing, connection pooling, load balancing, automatic failover, read/write separation, master-slave expansion, and ZooKeeper cluster deployment. SQL support includes SQL 92 and MySQL dialect features such as joins, unions, grouping, ordering, and distinct queries; some features remain on its roadmap. Query optimization addresses global-table joins, sharded tables, ER relations, and subqueries. Distributed transactions use two-phase commit in normal or XA modes, with XA depending on MySQL 5.7 XA transactions, backend availability, and disk reliability. Security controls include password encryption, IP allowlists, and SQL denylists. Explain plans, MySQL-compatible slow logs, and slow-query reports support operations. DBLE is self-hosted on Linux and GPL-2.0 licensed. The open-source plan costs nothing.

Spec sheet

Purpose
DBLE is high-scalability middleware for MySQL sharding.Read 4 Oct 2026 · github.com
Support
The DBLE documentation lists community support resources and says commercial support is available by contacting the maker.Read 4 Oct 2026 · actiontech.github.io
High availability
The DBLE server can run as a cluster so business workloads do not suffer from a single-node failure.Read 4 Oct 2026 · github.com
License and version
The repository identifies DBLE as GPL-2.0 licensed and the documentation branch as applying to version 3.23.08.x.Read 4 Oct 2026 · github.com
MySQL compatibility
DBLE uses the MySQL protocol and can replace MySQL in many cases without application code changes.Read 4 Oct 2026 · github.com
Operational tools
The official site lists slow logs compatible with MySQL slow-log analysis tools, an Explain execution plan, and slow-query performance analysis reports.Read 4 Oct 2026 · opensource.actionsky.com
Query optimization
It optimizes complex queries involving global-table joins, sharding tables, ER-relation tables, and subqueries.Read 4 Oct 2026 · github.com
Scaling and deployment
The official site lists read/write separation, master-slave expansion, complete expansion plans, and ZooKeeper cluster deployment.Read 4 Oct 2026 · opensource.actionsky.com
Security controls
The official site lists password encryption, IP allowlists, and SQL denylists.Read 4 Oct 2026 · opensource.actionsky.com
Sharding features
The official site lists hash, modulo, time-based, and range-based sharding algorithms, plus global tables, ER tables, and custom sharding algorithms.Read 4 Oct 2026 · opensource.actionsky.com
SQL support
DBLE supports SQL 92 and MySQL dialect features, including group by, order by, distinct, joins, and unions; some features are listed on its roadmap.Read 4 Oct 2026 · github.com
Transactions
DBLE supports distributed transactions with two-phase commit and offers normal and XA modes; XA depends on MySQL 5.7 XA transactions and backend availability and disk reliability.Read 4 Oct 2026 · github.com
Who it is for
DBLE is intended for teams replacing or scaling a single MySQL instance as business needs grow.Read 4 Oct 2026 · github.com

Plans and prices

DBLE (open-source version) Free GPL-2.0 licensed · enterprise support plans available Read 4 Oct 2026 · github.com

Every DBLE plan and price →

Strong points and limits

Strong points

  • Multiple sharding algorithms
  • MySQL protocol compatibility
  • Cluster operation supports failover
  • Query routing and load balancing
  • Operational slow-query tools

Limits

  • Some SQL features remain on roadmap
  • XA depends on backend conditions
  • Self-hosted Linux deployment required
  • Commercial support is separate

Who it suits

DBLE is intended for teams replacing or scaling a single MySQL instance as workloads grow. It suits Linux deployments needing sharding, routing, clustering, and distributed transaction features.

Verdict

DBLE provides a broad MySQL sharding and scaling layer with clustering, routing, optimization, and transaction options. Teams should account for roadmap gaps and XA dependencies when planning deployments.

Where Specifiction places it

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