Enrico Bianchi <enrico(dot)bianchi(at)ymail(dot)com> writes:
> When I launch a query (the principal field is JSONb), the database
> return this:
> ERROR: out of memory
> DETAIL: Failed on request of size 110558.
That error should be associated with a memory usage map getting dumped to
postmaster stderr, where hopefully your logging setup will catch it.
Can we see the map?
Even better would be a self-contained test case. Maybe you can generate
some artificial data that produces the problem?
regards, tom lane