| Type: | bool |
| Default: | off |
| Context: | superuser |
| Restart: | false |
Allows modification of the structure of system tables as well as certain other risky actions on system tables. This is otherwise not allowed even for superusers. Ill-advised use of this setting can cause irretrievable data loss or seriously corrupt the database system. Only superusers can change this setting.
Recommendations
Only available in single-user mode; this setting is for initdb and may be used in the future for upgrade-in-place.