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Running database migrations / schema changes often leads to table locking and downtime. For mission-critical applications that can't take any downtime, or apps with huge tables where schema changes take several hours, this is bad news. The way to get around this is by using online schema change tools, such as gh-ost, pt-online-schema-change, or Vitess online DDL. At a high level, these tools work by copying the original schema onto a new table known as a shadow table. The data is copied over to the shadow table, and once they're close to in sync, the tables are swapped. This video covers this whole process step by step, as well as what it looks like to run schema changes without these tools. 00:00 Intro 01:50 Schema change locking demo 03:50 Intention, shared, and exclusive locks 06:47 Intro to online schema change tools 07:24 Schema change demo in PS without online DDL 09:36 Online schema change demo 13:24 How do online schema change tools work? 25:23 Reverting a schema change 26:11 How do schema reverts work? 28:11 MySQL instant DDL 28:55 PlanetScale gated deployments, deploy requests, and reverts To learn more about PlanetScale, head to https://planetscale.com/youtube! 💬 Follow PlanetScale on social media • Twitter: https://twitter.com/planetscale • Discord: https://discord.gg/pDUGAAFEJx • TikTok: https://www.tiktok.com/@planetscale • Twitch: https://www.twitch.tv/planetscale • LinkedIn: https://www.linkedin.com/company/planetscale

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