9.1 Compacting Repository History

Everything in life needs a little maintenance to work optimally. Your car needs its oil changed, your floors need sweeping, and Git needs to have git gc run.

Git stores everything. The problem with this is that it occasionally will have some leftover data that is no longer useful. For example, when you use the --amend parameter on git commit to fix a commit, Git remembers the older revision too. Or you delete an experimental branch using the git branch -D, and Git knows what was in that branch even though nothing references it any longer.

This is where git gc comes in. Once a month, or about every 100 or so commits, it’s a good idea to run git gc to tidy things up by optimizing the way Git stores its history ...

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