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Understanding PostgreSQL MVCC & Tuple Versioning

By Elena Rostova (Sample Profile) · 4 min read

Under Multi-Version Concurrency Control (MVCC), PostgreSQL does not mutate database rows in-place during UPDATE operations. Instead, it writes a completely new physical tuple to the data page. The vacuum process eventually reclaims dead tuples to prevent table bloat.

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"PostgreSQL does not mutate database rows in-place during UPDATE operations. Instead, it writes a completely new physical tuple to the data page."

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