# Vitess Dolt's SQL server runs on [a fork of Vitess](https://github.com/dolthub/vitess). Vitess is a MySQL database sharding solution that was created to scale YouTube: > Vitess is a database clustering system for horizontal scaling of MySQL through generalized sharding. Vitess has been a core component of YouTube's database infrastructure since 2011, and has grown to encompass tens of thousands of MySQL nodes. In addition to implementing the MySQL server and wire protocol, Vitess also provides the SQL parser for the database. ## Dolt's use of Vitess Dolt's fork of Vitess has headed in a different direction from the main project. In addition to adding support for DDL statements, stored procedures, and triggers (never a priority of the Vitess project), Dolt's fork prunes away the 90% of Vitess that isn't vital to Dolt's current roadmap. You can read details about this work in [this blog post](https://www.dolthub.com/blog/2020-09-23-vitess-pruning/). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dolthub.com/architecture/sql/vitess.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.