Zero-Downtime Schema Changes (You Can Do This)
📰 Dev.to · Tosh
Learn how to make zero-downtime schema changes to large databases without locking tables, using techniques like shadow tables and online DDL
Action Steps
- Create a shadow table with the new schema using a tool like MySQL or PostgreSQL
- Copy data from the original table to the shadow table using a technique like replication or data pumping
- Switch to the shadow table and drop the original table
- Use online DDL to make schema changes without locking the table
- Test and verify the changes using a query tool or automated tests
Who Needs to Know This
Database administrators and developers who work with large databases can benefit from this technique to minimize downtime and improve system availability. This is particularly useful in systems with high traffic or strict uptime requirements.
Key Insight
💡 Using shadow tables and online DDL can help you make schema changes without downtime, even on large tables with millions of rows
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🚀 Zero-downtime schema changes? Yes, you can! Learn how to add columns to large tables without locking them 📈
Key Takeaways
Learn how to make zero-downtime schema changes to large databases without locking tables, using techniques like shadow tables and online DDL
Full Article
You need to add a column to a table with 100 million rows. Old approach: Lock the table, add column,...
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