Occasionally this debate rages. From those who say that a transaction log
that logs with a simple timestamp, which may not be unique, is ok and
doesn't need a unique key to those who say even that needs a unique key. I
can see both sides of the argument. Hey, even IBM's journals have a
transaction number that is unique. However, some may be concerned about
the disk space used, etc. Doesn't take much to generate a unique key.
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