On Thu, Feb 17, 2011 at 6:49 PM, Nico Kadel-Garcia <nkadel at gmail.com> wrote: > > Also, people like me might say something different from a work email > account than from a personal account. > > I worry about using the email address as the key, because it makes it > very difficult to *preserve* a user's history across address changes. > I like my GMail account, but I've had old Comcast or university > accounts from which I submitted bugs to RHEL years ago. If I'm not > mistaken, index management by numerical keys can often be > significantly faster than by text keys. echo "Nico Kadel-Garcia G MM/DD/YYYY Born_in_City, Nation Mother's_Maiden_Name" | md5sum -t 352d6060b85ef831453bd71cfe22e9a9 - works very well for ISP subscriber account numbers.