> Thinking more about other systems, ISTM that Oracle can do this, as can
> any MVCC based system. OTOH DB2 and SQLServer take block level read
> locks, so they can do this too, but at major loss of concurrency and
> threat of deadlock. Having said that, *any* system that chose not to do
> this would be severely sub-optimal with buffer manager contention. So
> AFAICS they all need this optimization.
MySQL/Innodb would presumably do it also I wonder...
Chris