Nowadays companies use different database technologies for keeping their data and often they need to access data from one data source to another data source. However, as the data is on different database products, it does not work, and this takes up lots of effort on part of the developer to intermix data between different databases.

The Oracle® Exadata® system introduces storage indexes, which improve database performance. A storage index is a structure store in memory that contains key statistics. This storage index enables Exadata to speed up disk I/O operations and queries by checking the index first to find relevant data rather than by reading every row.

This blog discusses the Oracle Exadata Smart Flash Cache feature and its architecture, including the write-back flash cache feature.