Re: serializable read only deferrable

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> I'm reviving the discussion on the subject topic because I just had
> an epiphany which makes it seem simple to implement.  The concept of
> this is that if you start a SERIALIZABLE READ ONLY transaction in an
> SSI environment when certain conditions are true, it doesn't need to
> acquire predicate locks or test for rw-conflicts.

I assume this would have to be a "hard" definition of READ ONLY, not
the rather squishy definition we use now?  How would we manage the
compatibility implications?
        regards, tom lane