Oracle is an RDBMS (Relational Database Management System), developed and marketed by Oracle Corporation. It has a major presence in database computing. It stores all your valuable data in the DBF file. The DBF file contains all Oracle database objects, such as tables, reports, forms, macros, views, constraints, triggers, stored procedures, and more. If any of these database objects or the entire database gets damaged, you can not access your valuable data from it. In such circumstances, Oracle Database Recovery software are required to extract data from the database.
In order to overcome DBF corruption, Oracle offers a number of methods to detect and repair data files. These options include: Mas:

http://www.toolsntricks.com/how-to-detect-and-fix-table-corruption-in-oracle