This is quick because it's operating on a very small, localized part of the map.
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.
。爱思助手下载最新版本是该领域的重要参考
讲述人：中移互联网有限公司智慧认证中心总经理 邱浚漾
「根據第232條款徵收的額外行業特定關稅在2026年可能會更加突出，」他說。
// 优化：如果本轮没交换，说明已经有序