"Ed L." <pgsql@xxxxxxxxxxxxx> writes: > We have 3 clusters with 24K, 34K, and 47K open files according to > lsof. These same clusters have 164, 179, and 210 active > connections, respectively. Their schemas, counting the number > of user and system entries in pg_class as a generously rough > measure of potential open files, contain roughly 2000 entries > each. Those open files seem pretty plausible, they're just much > higher than what we see on the older systems. Hm. AFAICT from the CVS logs, 7.4.2 and later should have about the same behavior as 8.1.* in this regard. What version is the older installation exactly? You can always reduce max_files_per_process if you want more conservative behavior. regards, tom lane