Chris Bitmead <chris@bitmead.com> writes:
> I inserted some debug into libpq, then I ran psql, and I noticed that
> there are two 'Z' "Ready for query" messages sent after each query. Is
> there a reason for that? Is it a bug?
I'm pretty sure the backend sends only one 'Z' per query cycle. Are you
watching the outgoing requests too? Maybe psql is sending an extra
empty query. (It didn't use to do that, but maybe it does after Peter's
recent work on it...)
regards, tom lane