Hi, On Wednesday, July 25, 2012 04:56:20 PM Tom Lane wrote: > Aleksei Arefjev <aleksei.arefjev@xxxxxxxxxxxxxxxx> writes: > > On 24 July 2012 20:21, Richard Huxton <dev@xxxxxxxxxxxx> wrote: > >> I'm not sure if I'm reading this right, but are there more than 48 > >> million BEGINs that took 0s each (presumably rounded down) and then a > >> handful taking about 0.8s? > > I'm wondering exactly where/how the duration was measured. If it was at > a client, maybe the apparent delay had something to do with network > glitches? It seems suspicious that all the outliers are around 0.8s. > It would be useful to look to see if there's any comparable pattern > for statements other than BEGIN. > > As Richard says, a BEGIN by itself ought to take negligible time. He earlier also asked on the IRC-Channel and I got the idea that the problem could be explained by pgbouncer in transaction pooling mode waiting for a free backend connection. Aleksei confirmed that they use pgbouncer in that configuration, so that might be it. Andres -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
