I would like to use git to track some database files of sizes from 1MB to 50MB. I want to know does git compress them for storage or not. If so, what will be the expected compression ratio. Those files normally compressed to 25% of original size using zip.
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Jeff KingRe: tracking binary files
On Thu, Feb 19, 2009 at 11:16:02AM +0800, bill lam wrote:
> I would like to use git to track some database files of sizes from 1MB > to 50MB. I want to know does git compress them for storage or not.
Yes, git will compress them via zlib.
> If so, what will be the expected compression ratio. Those files > normally compressed to 25% of original size using zip.
Then I would expect the same ratio, since I believe zip and zlib both use the "deflate" algorithm.
Note, however, that git will also do delta compression between versions. So storing N versions of a file should be no _worse_ than zipping and keeping those N versions. But if the database files have small enough changes from version to version (which depends on the database format, and how much the on-disk structure changes for each update) then it will compress even more.
-Peff