Mariel Cherkassky <mariel.cherkassky@gmail.com> writes:
> If I'll try to run the following query and cancel it manually(ctrl+c) :
> select pg_sleep(10)
> I will see in the logs the following messages :
> 2019-12-08 17:16:34 IST postgres 30797 LOG: statement: select
> pg_sleep(10);
> 2019-12-08 17:16:36 IST postgres 30797 ERROR: canceling statement due to
> user request
> 2019-12-08 17:16:36 IST postgres 30797 STATEMENT: select pg_sleep(10);
Note that that's going through "simple query" protocol (which is why
it says "statement:") but your application is evidently using "extended
query" protocol (because you see "execute ...:", at least when it's
working correctly). I wonder whether the explanation is somewhere in
that.
The best theory I have at the moment, though, is that something is taking
exclusive locks on system catalogs, blocking parsing of even trivial
statements.
regards, tom lane
