Meta data table to know DML operations on table

Use below table if you want to know recent updates, inserts or deletions into table.

ALL_TAB_MODIFICATIONS -describes tables accessible to the current user that have been
                                                     modified since the last time statistics were gathered on the tables

DBA_TAB_MODIFICATIONS - provides such information for all tables in the database.

USER_TAB_MODIFICATIONS- provides such information for tables owned by the current user