"Zwettler Markus (OIZ)" <Markus.Zwettler@xxxxxxxxxx> writes: > I tried this on postgres 9.6: > postgresql.conf -> allow_system_table_mods=on + pg_ctl restart > # alter table pg_catalog.pg_shdepend set (autovacuum_vacuum_scale_factor = 0, autovacuum_vacuum_threshold = 1000); > ERROR: shared tables cannot be toasted after initdb > Time: 0.618 ms > # alter table pg_catalog.pg_largeobject set (autovacuum_vacuum_scale_factor = 0, autovacuum_vacuum_threshold = 1000); > ERROR: AccessExclusiveLock required to add toast table. > Time: 0.590 ms Interesting. FWIW, these examples do seem to work in v12 and up. Since we don't consider this a supported case, I doubt anyone would be interested in trying to back-port whatever rearrangement allowed it to work. regards, tom lane
