The document discusses three models for using flash storage with Oracle Databases: 1) transparent disk replacement, 2) fast storage managed by the database kernel through features like Database Smart Flash Cache, and 3) Exadata Smart Flash Cache which utilizes flash on Exadata storage servers to cache hot database data for ultra-fast performance. Significant value is seen in models where the flash storage management has internal knowledge of how the database functions rather than being simply transparent disk replacements.