Hi,
From http://www.postgresql.org/docs/current/static/sql-altersystem.html
"Values set with ALTER SYSTEM will be effective after the next server
configuration reload (SIGHUP or pg_ctl reload), or after the next server
restart in the case of parameters that can only be changed at server start."
Isn't it unfortunate that the command used for changing the configuration
file from within SQL mentions SIGHUP and pg_ctl reload, but not "select
pg_reload_conf();", as a way to activate that change?
Cheers,
Jeff