Git packfiles use delta compression, storing only the diff when a 10MB file changes by one line, while the objects table stores each version in full. A file modified 100 times takes about 1GB in Postgres versus maybe 50MB in a packfile. Postgres does TOAST and compress large values, but that’s compressing individual objects in isolation, not delta-compressing across versions the way packfiles do, so the storage overhead is real. A delta-compression layer that periodically repacks objects within Postgres, or offloads large blobs to S3 the way LFS does, is a natural next step. For most repositories it still won’t matter since the median repo is small and disk is cheap, and GitHub’s Spokes system made a similar trade-off years ago, storing three full uncompressed copies of every repository across data centres because redundancy and operational simplicity beat storage efficiency even at hundreds of exabytes.
2026-02-27 00:00:00:0本期主讲人：国家数据发展研究院院长 胡坚波3014245010http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142450.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142450.html11921 数据要素价值如何充分释放（高质量发展故事汇·第16期）
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