Bruce Momjian <[EMAIL PROTECTED]> writes: > Gregory Stark wrote: >> I have a question about what would happen for a transaction running a command >> like COPY FROM. Is it possible it would manage to arrange to have no live >> snapshots at all? So it would have no impact on concurrent VACUUMs? What >> about >> something running a large pg_restore?
> Interesting idea. Indeed. Currently, COPY forcibly sets a snapshot on the off chance something will use it, but I could certainly see making that happen "lazily", ie not at all in the simple case. pg_restore is probably a lost cause, at least if you are running it in single-transaction mode. I guess there'd be tradeoffs as to whether to do that or not ... regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org