Adrian Klaver-4 wrote > I can not replicate using 50 clients instead of 2000. I suspect either > has to do with the extreme number of clients or it is an artifact of > from some other process. And I have replicated it with 50 clients as well... lsof output: 51 data/base/13328/2601 command: watch 'lsof -e /run/user/1001/gvfs +D data|awk "{print \$NF}"|sort|uniq -c|sort -nr' Maybe our versions of PostgreSQL differs? I use "PostgreSQL 9.5.4 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 6.1.1 20160621 (Red Hat 6.1.1-3), 64-bit" -- View this message in context: http://postgresql.nabble.com/pg-am-access-in-simple-transaction-tp5931974p5931991.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general