How to find last schema modification time ?

Hello. I would like to get the following info about our db (11gR2 Linux x64) full schema list and each schema last modification time (so, if any changes were made in any table, etc). It also could be good get any info about who was last modifier, but as I understand, it is not possible without audit turned on ?

DML changes isn't something Oracle tracks unless you explicitly do something like enable auditing.
It would require full scanning every table in the schema, but you could do
select max(ora_rowscn )
from schema_name.table_nameand pick the largest value. Assuming that you don't care about deletes, this would give you the SCN of the last INSERT or UPDATE on a table in the schema. If the last such change was relatively recent, you could convert it to a timestamp by calling SCN_TO_TIMESTAMP. But that mapping is only retained for a few days. If "long time" means more than a week, then you're trying to extrapolate a SCN back in time which is likely to be very error-prone.
Justin

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