select ksppstvl from x$ksppsv where indx = (select indx from x$ksppi where ksppinm = '_in_memory_undo');
--alter system set "_in_memory_undo"=false;
select supplemental_log_data_min as supp_log,
supplemental_log_data_pk as supp_pk,
supplemental_log_data_ui as supp_ui
from v$database;
--alter database add supplemental log data (primary key, unique index) columns;
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