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Oracle Hybrid Columnar Compression and its effect in CDC/Replication

in GoldenGate, Streams and Distributed Database (MOSC)

HCC is a data storage method that organizes data within a database block using a combination of both row and columnar methods. The key trade-offs it targets:

•Gets the compression benefits of columnar storage (smaller footprint, better I/O for analytical queries)

•Avoids the performance shortfalls of a pure columnar format (which can struggle with transactional/row-oriented workloads)

In practice, HCC is available on Oracle Exadata and certain Oracle-qualified storage (ZFS appliances, Pillar Axiom, etc.). It’s particularly useful for data warehousing and archival use cases where high compression ratios matter but you still need reasonable row-level access.

Good Fit for HCC

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