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MVCC in PostgreSQL — 8. Freezing

travels" from the past to future, vacuuming does one more task (in addition to freeing page space). It finds pretty old and "cold" tuples (which are visible in all snapshots and are unlikely to change

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Indexes in PostgreSQL — 9 (BRIN)

travel class "fare_condition" (the column contains three unique values) and type of the flight