Marcin Barczynski <mbarczynski@xxxxxxxxxxxxxxxxxxx> writes: > It's always /opt/prod/pg/9.6/base/18370/1108887031. Unfortunately, no trace > of it in pg_class: It's probably a mapped system catalog, which will have relfilenode = 0. Try SELECT relname FROM pg_class WHERE pg_relation_filenode(oid) = 1108887031; My guess is that whichever catalog it is is badly bloated. regards, tom lane