How to free up used space, after deleting millions of records in a table?
delete from t where fecha_hora <= TO_DATE('2020-12-31 23:59:59', 'YYYY-MM-DD HH24:MI:SS');
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delete from t where fecha_hora <= TO_DATE('2020-12-31 23:59:59', 'YYYY-MM-DD HH24:MI:SS');