
     </P
><P
>      The 9.2 change to reduce the number of snapshots taken during query
      execution led to some anomalous behaviors not seen in previous
      releases, because execution would proceed with a snapshot acquired
      before locking the tables used by the query.  Thus, for example,
      a query would not be guaranteed to see updates committed by a
      preceding transaction even if that transaction had exclusive lock.
      We'll probably revisit this in future releases, but meanwhile p