On Fri, 2007-03-23 at 17:35 -0400, Tom Lane wrote: > To make intra-transaction advancing of xmin possible, we'd need to > explicitly track all of the backend's live snapshots, probably by > introducing a "snapshot cache" manager that gives out tracked > refcounts > as we do for some other structures like catcache entries. This might > have some other advantages (I think most of the current CopySnapshot > operations could be replaced by refcount increments)
Seems like we should do this for many reasons, whether or not this is one of them. I seem to have butted heads and lost more than once with not being able to tell which Snapshots exist. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
