Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom Lane wrote:
>> MVCC goes out the window, eh? Not to mention transaction rollback ability?
> If the old row is not visible to any transactions, why would it not work?
The old row is ALWAYS visible to somebody, until you commit (if you ever
do). You can't simply overwrite existing data.
regards, tom lane