> However, a SELECT eventually fails with "canceling statement due to conflict
> with recovery".
>
> Where else can I check, or what else can I do to determine what the problem
> is?
...or maybe there _is_ no problem.
select count(*) from big_table; -- will fail because it's long-lived and rows
are changing (deletes, inserts, updates) underneath it.
select * from big_table where id=nnn; -- succeeds because the window for
something in that particular row to change during the select is too small.
All's good!
Sorry about the noise.
h