ShardingSphere-Proxy

Overview

ShardingSphere-Proxy is self-hosted database middleware that lets applications connect to underlying databases through a familiar server protocol. It suits teams scaling or coordinating data across multiple databases; its breadth is compelling, but deployment and system-database limitations deserve attention.

Rather than replace a database, Proxy sits between clients and databases to route and manage their work. ShardingSphere dates to 2018, and Proxy can be deployed as a binary, Docker image or Helm deployment. That flexibility serves infrastructure teams, but it also means operating the service is the user's responsibility.

Key features

Sharding and transactions

Sharding distributes storage and computing across underlying databases, making Proxy relevant when a single database is no longer the desired scaling model. Distributed transactions use a hybrid engine based on XA and BASE. These capabilities are useful for workloads spanning data sources, though they position the product as specialized infrastructure rather than a general-purpose database.

Routing and availability

Read/write splitting balances reads using SQL semantics and awareness of database topology. Query routing, load balancing, connection pooling and automatic failover round out the proxy role, giving teams a way to coordinate connections and traffic across backends.

Migration, federation and protection

Data migration with sharding and federated queries across data sources extend its reach beyond routine request routing. The encryption module is designed for transparent data encryption, and data masking is another feature area. Together, these tools make the package useful for teams managing data across a distributed environment.

Protocols and deployment

The quick start describes theoretical support for client operations using MySQL, PostgreSQL, openGauss and Firebird protocols. The binary requires Java JRE 8 or higher; Docker requires no additional dependency. MySQL backends require mysql-connector-j-8.4.0.jar in Proxy's ext-lib directory. Release files should be verified with GPG or SHA-512 signatures.

One practical caveat is limited support for system databases and tables such as information_schema and pg_catalog. Some graphical database clients may therefore show errors, which can complicate workflows that rely on those views.

Pricing

Apache ShardingSphere-Proxy is free: its plan costs nothing and includes the open-source binary distribution plus Docker and Helm deployment. There is no trial to weigh against a paid tier, and the self-hosted model leaves deployment and operation with the adopting team. This is a strong fit for teams able to run their own infrastructure; it is not a hosted-service option.

Platforms

ShardingSphere-Proxy supports Linux, macOS and Windows, as well as self-hosted deployment. The binary, Docker and Helm options accommodate different deployment setups, with the Java requirement applying to the binary distribution.

Who it's for

Choose Proxy when you need a self-hosted layer for sharding, distributed transactions, SQL-aware read/write splitting or migration and federation across data sources. It is best suited to teams comfortable operating middleware and accommodating its runtime and backend setup requirements. Look elsewhere if system-database compatibility in graphical clients is central to your workflow, or if you need a managed service.

Pros and cons

Pros

• Free, open-source deployment choices include a binary, Docker and Helm, with no additional dependency required for Docker.
• Sharding, transaction support, routing, load balancing and automatic failover address several distributed-database needs in one proxy.
• Protocol support spans MySQL, PostgreSQL, openGauss and Firebird clients.
• Migration, federation and data-protection features extend its usefulness beyond connection routing.

Cons

• The binary requires Java JRE 8 or higher, and MySQL backends need a connector JAR installed in ext-lib.
• Limited support for system databases and tables can cause errors in some graphical database clients.
• Self-hosting means the adopting team must provide and operate the deployment.

Alternatives

Browse Database Proxy Software for more options in the category.

• ProxySQL is another free option, with a Linux and self-hosted Community plan that includes all ProxySQL Core Features and community support channels.
• TurbineProxy is a free open-source alternative with no per-query fees.
• PgDog offers free, open-source self-hosted software for Linux, macOS and Windows.
• Pgpool-II is free, open-source self-hosted middleware for Linux.
• Cloudflare Hyperdrive is a freemium web option with a free tier capped at 100,000 database queries per day and 10 configured databases per account.
• PgCat is a free, MIT-licensed self-hosted option for Linux.
• DBLE offers a free GPL-2.0-licensed open-source version, with enterprise support plans available.
• Heimdall Database Proxy is a freemium alternative.

Verdict

ShardingSphere-Proxy is a strong choice for infrastructure teams that want a free self-hosted proxy combining sharding with routing, transaction and migration capabilities. Its main advantage is that breadth in one package; its main reason to look elsewhere is the operational burden, compounded by runtime setup and limited system-database support.