On Thursday 28 May 2009 04:49:19 Tom Lane wrote: > Yeah. The fundamental problem with all the "practical" approaches I've > heard of is that they only work for a subset of possible predicates > (possible WHERE clauses). The idea that you get true serializability > only if your queries are phrased just so is ... icky. So icky that > it doesn't sound like an improvement over what we have.
Is it even possible to have a predicate locking implementation that can verify whether an arbitrary predicate implies another arbitrary predicate? And this isn't constraint exclusion, where it is acceptable to have false negatives. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
