A GUID plus timestamp + job info would most likely insure uniqueness.
I still don't totally trust GUID's by themselves, although they seem to work well on the Windows platform :-)
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date: Tue, 1 May 2012 14:56:31 -0400
subject: Re: Unique ID
Timestamps may not be unique. 80-100 million transactions. Was that a
day's worth? An hours worth? What? And some processes have an annoying
habit of not populating the full milliseconds portion of a timestamp.
Can't name any, just some fog in the back of my head.