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Technology used in Oracle Advanced Compression

For compression of table data, Advanced Compression extends industry standard algorithms to compress data at a block level. Repeating data patterns are stored in the block header as symbols, and occurrences of such data in the block are replaced with pointers to symbols. For unstructured data compression, backup compression and network compression, Advanced Compression uses industry standard algorithms that work on a similar concept of eliminating data redundancies.

Oracle Database does not need to decompress table blocks when reading data. Oracle can keep blocks compressed in memory and read them directly. Hence, more data can be packed in memory which results in improved cache hit ratio and reduced I/O.
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