How can Oracle recover data that has been deleted by a …

Once data is deleted using the TRUNCATE command in Oracle, it cannot be recovered. TRUNCATE is a DDL (Data Definition Language) command that directly frees up the storage space of a table and does not generate any rollback information in the UNDO tablespace. Therefore, it is impossible to recover data deleted by TRUNCATE using transaction rollback or Undo logs.

It is recommended to back up data before executing the TRUNCATE command in order to restore the data when needed. Alternatively, use the DELETE command before removing data, as it generates UNDO information which can be used to recover deleted data through transaction rollbacks.