Thomas Munro <thomas.munro@enterprisedb.com> writes:
> Ah, so you have many Gather nodes under Append? That's one way to eat
> arbitrarily many DSM slots. We allow for 64 + 2 * max_backends. Does
> it help if you increase max_connections? I am concerned about the
> crash failure mode you mentioned in the first email though: we should
> always be able to handle that condition gracefully.
I suspect this is an instance of the issue I complained about before [1]
that parallel query is unable to cope with worker start failure.
regards, tom lane
[1] https://www.postgresql.org/message-id/4905.1492813727@sss.pgh.pa.us
