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This is marked PGC_SIGHUP, so it can only be set in a configuration file, not anywhere else; and it is also marked GUC_DISALLOW_IN_AUTO_FILE, so it can't be set using ALTER SYSTEM. When set to false, the ALTER SYSTEM command is disallowed. There was considerable concern that this would be misinterpreted as a security feature, which it is not, because a determined superuser has various ways of bypassing it. Hence, a lot of work has gone into wordsmithing the documentation, in the hopes of avoiding any such confusion. Jelte Fennemia-Nio and Gabriele Bartolini, with wording suggestions for the documentation from many others. Discussion: http://postgr.es/m/CA%2BVUV5rEKt2%2BCdC_KUaPoihMu%2Bi5ChT4WVNTr4CD5-xXZUfuQw%40mail.gmail.com