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Our MySQL 5.1 build is 50 MiB, while 5.5 is 152 MiB. It's mostly in the bin directory, which is 110 MiB. Apparently MySQL does some very bad static linking (for instance, the trivial MySQL utilities "replace" and "resolveip" are both almost 3 MiB).
@edolstra Have you looked into this? Will it make it into 14.04?
On a side note, mysql is such big also on other distros. Another thing is that binaries are not stripped for some reason, though stripping saves very little disk space (e.g. 3.2m instead of 3.3m for the mysql executable).
I think the answer is obvious, it was bought by Oracle .