# gh-ost: GitHub’s online schema migration tool for MySQL

- **期号**: SRE Weekly Issue #37（2016-08-28）
- **作者**: —
- **链接**: http://githubengineering.com/gh-ost-github-s-online-migration-tool-for-mysql/

## 简介

Other online schema-change tools I’m familiar with (e.g. pt-online-schema-change) use triggers to keep a new table in sync with changes while copying old rows over.  Instead, gh-ost monitors changes by hooking on as a replication slave.  Very clever!  This article goes into several reasons why this is a much better approach.

## 正文

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