I've built a MySQL proxy that supports online DDL
Hi everyone. Over the past year, I've built a MySQL Proxy that supports Online DDL. I'm not sure if there are other proxies out there with this feature, but I found it fascinating and thought it was worth sharing. Of course, this proxy also supports many other features, such as Read Write Split, Read After Write Consistency, Load Balancing, and Transparent Failover. I didn't build this database from the bottom up; instead, I forked Vitess and put a lot of effort into overhauling its architecture and SQL Engine Layer. Moving forward, I hope to introduce more developer-friendly features into…
In plain words
This is a MySQL proxy built by forking and redesigning Vitess, designed for database administrators and developers managing MySQL infrastructure. It enables online DDL operations alongside standard proxy features including read-write splitting, read-after-write consistency, load balancing, and transparent failover. The tool aims to simplify schema changes without downtime while maintaining database performance and reliability.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi everyone. Over the past year, I've built a MySQL Proxy that supports Online DDL. I'm not sure if there are other proxies out there with this feature, but I found it fascinating and thought it was worth sharing. Of course, this proxy also supports many other features, such as Read Write Split, Read After Write Consistency, Load Balancing, and Transparent Failover. I didn't build this database from the bottom up; instead, I forked Vitess and put a lot of effort into overhauling its architecture and SQL Engine Layer. Moving forward, I hope to introduce more developer-friendly features into this Proxy. The next major feature should be something similar to the Branch functionality of PlanetScale.
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