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Last Updated: September 28, 2026
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How does PostgreSQL decide which version of a row your transaction is allowed to see? In Part 2 of our PostgreSQL Dive into the world of Multiversion Concurrency Control ( How your application should behave when multiple users concurrently accessing the same In this video, we break down one of the most important concepts in Every UPDATE in Postgres quietly leaves a dead copy of your old row behind. That one design choice, Ever wondered how PostgreSQL and MySQL handle thousands of concurrent users without grinding to a halt? The answer is ... Every time you change a value in a When you update a row in Postgres, the old one does not go anywhere. Postgres does not overwrite it. It writes a new version of ...
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