importantSYS.SOURCE: boringSQL• 2026-07-06T10:02:08Z

PostgreSQL VACUUM Process Analysis at the Page Level

#postgresql #vacuum #database optimization

This article provides an in-depth technical analysis of PostgreSQL's VACUUM process at the page level, detailing how dead tuples are pruned, frozen, and space is reclaimed. It explains the three-phase approach, including heap scanning, index cleanup, and heap cleanup, with a focus on line pointer management and free space map updates.

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