Update before commit

Is an update before a commit necessary, or will Subversion tell you when a
repository has been updated since you checked out your working copy and
REQUIRE an update?

Does this depend on whether somebody has made a change to *anything* in the
repository (hence increasing the revision number of the project), or whether
they've made a change to the files you've changed in your repository?

I ask because I read an article about continuous integration that says the
build on the integration server might fail if you forget to update before
checking in...that sounds scary and like there's no failure from Subversion
when something like this happens (isn't that the kind of thing that version
control prevents)?

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