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by bad_user 6083 days ago
The downside is that pointer sizes in 64bit software are double, and this does sometimes have issues with the processors cache. Personally I haven't seen much difference in practice either way (except in cases where you have more RAM ... MySql on 10 GB totally rocks :)).

I was asking because I choose to install the 32bit version ... 64 bit packages are more unstable being less popular.