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Ever deleted a million rows, only to find your How does PostgreSQL decide which version of a row your transaction is allowed to see? In Part 2 of our PostgreSQL How PostgreSQL lets readers and writers work at the same time, shown on PostgreSQL 16 with real queries. The hidden ctid ... 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 ... Every UPDATE in Postgres quietly leaves a dead copy of your old row behind. That one design choice, It's hard to be a developer today without using a
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