![]() ![]() Storing column data together, with the same data type and similar characteristics, dramatically increases the storage savings achieved from compression. After the column data for a set of rows has been compressed, it is fit into the compression unit. When data is loaded, groups of rows are stored in columnar format, with the values for a given column stored and compressed together. ![]() A logical construct called the compression unit is used to store a set of HCC-compressed rows. ![]() HCC utilizes a combination of both row and columnar methods for storing data. Oracle's Hybrid Columnar Compression (HCC) technology is a new (to Oracle Database 11 g Release 2) method for organizing data within a database block. 2.1.1 Support Hybrid Columnar Compression on Pillar Axiom and Sun ZFSSA ![]()
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