> Maybe a stupid question, but I wondered if when using persisten > connection, I could be sure there would be no problem. From the doc, > currval "Returns the value most recently obtained by nextval for this > sequence in the current server process." > > Can you confirm me several script using the same persistent connection > in parallel are in separate server processes? PHP will execute 'begin; rollback;' to your connection before passing it to another PHP process, guaranteeing that unclosed transactions won't leak. Chris