Christian -- <original text snip because this POS editor won't let me properly edit> postgres version ? type of replication ? changes from postgres config defaults ? Do they happen more at peak usage, semi regularly or sporadically ? Possibly some sporadic postgres process such as checkpoints of autovac processes kicking off. Do your logs show anything ? HTH, Greg W. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general