Data corruptions can stem from many different sources. For example, they can be caused by an errant bit-flip on a disk, or a bug in the operating system, Storage Area Network (SAN), or storage system. If not prevented or repaired, data corruptions can bring down the database and even result in loss of key business data. This paper discusses the essential tools and techniques for prevention, detection, and repair of block corruptions in the Oracle database. Once corruptions are isolated, Oracle offers BMR, Data Guard, and media recovery to recover the data. Database-wide logical corruptions caused by human or application errors can be easily undone with Flashback Database.
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