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Compression > SecureFiles

SecureFiles

Oracle Database 11g also introduced SecureFiles, which provides compression for large objects stored in the database. SecureFiles gives you the option of three different levels of compression, where the effectiveness of the compression is balanced against the impact on CPU overhead.

Just as compression increases the effectiveness of storage by reducing the space requirements of data, SecureFiles goes an extra step by offering deduplication of large objects. Deduplication computes a hash value for stored large objects so that these objects can be uniquely identified. If an operation attempts to insert another copy of an existing object, SecureFiles simply adds a pointer to the already existing copy of the object. By reducing the number of large objects stored, SecureFiles improves storage efficiency, with no impact on read or write operations.


  

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