Re: User-facing aspects of serializable transactions - Mailing list pgsql-hackers

On Thursday 28 May 2009 03:38:49 Tom Lane wrote:
> * SET TRANSACTION ISOLATION LEVEL something-else should provide our
> current snapshot-driven behavior.  I don't have a strong feeling about
> whether "something-else" should be spelled REPEATABLE READ or SNAPSHOT,
> but lean slightly to the latter.

Could someone describe concisely what behavior "snapshot" isolation provides 
that repeatable read does?