Tom DalPozzo <t.dalpozzo@gmail.com> writes: > 2017-04-18 22:06 GMT+02:00 Tom Lane <tgl@sss.pgh.pa.us>: >> If your session is just sitting, that's not surprising. I think stats >> updates are only transmitted to the collector at transaction end (and >> even then, only if it's been at least N msec since the last transmission >> from the current session).
> Hi, my transaction ended, that I waited 1 min and queried the stat. > I had to wait for session end in order to see the updeted stats. > Did you mean "...to the collector at SESSION end"?
No, I meant what I said. No amount of just-sitting will cause a session to do something: it either transmits stats at transaction end or it doesn't because it thinks it's too soon since its last update. If you want to force out the stats, you could wait a second or so and then do a dummy transaction (even "select 1" will do, in testing).
BTW, a quick look at the code says the threshold is 500 msec, ie, stats are sent only if it's been at least half a second since the session's last report.
I tried with a dummy select with no success. I detailed my test in my answer to Adrian Klaver.