On Mon, 13 Jul 2020 at 23:51, Peter Eisentraut <peter.eisentr...@2ndquadrant.com> wrote: > I have an anecdote that might be related to this discussion. > > I was running an unrelated benchmark suite. With PostgreSQL 12, one > query ran out of memory. With PostgreSQL 13, the same query instead ran > out of disk space. I bisected this to the introduction of disk-based > hash aggregation. Of course, the very point of that feature is to > eliminate the out of memory and make use of disk space instead. But > running out of disk space is likely to be a worse experience than > running out of memory. Also, while it's relatively easy to limit memory > use both in PostgreSQL and in the kernel, it is difficult or impossible > to limit disk space use in a similar way.
Isn't that what temp_file_limit is for? David
