2016-03-11 0:17 GMT+01:00 Tom Lane <t...@sss.pgh.pa.us>:
> Robert Haas <robertmh...@gmail.com> writes:
> > Or ... maybe this is intentional behavior? Now that I think about it,
> > doesn't each backend cache this info the first time its transaction
> > reads the data?
> Your view of pg_stat_activity is supposed to hold still within a
> transaction, yes. Otherwise it'd be really painful to do any complicated
> joins. I think there may be a function to explicitly flush the cache,
> if you really need to see intratransaction changes.
This behave has impact on PL functions that try to repeated check of
pg_stat_activity. But this use case is not frequent.
> regards, tom lane