Friday, 15 August 2014

Oracle Database Gets In-Memory

Oracle Database 12c Release 1 ( is now available and includes the much anticipated “In-memory” feature, along with several other improvements.
Some important features introduced –
  • In-memory Column Store – Storing of objects in memory in a  Columnar format, with much better performance for scans, joins and aggregates
  • In-memory Aggregation- improves performance of star queries and reduces CPU usage
  • Advanced Index Compression
  • APPROX_COUNT_DISTINCT() – significantly faster than exact aggregation for large volumes of data, with negligible deviance
  • Attribute Clustering- allows storing logically related data in close physical proximity. Can greatly reduce amount of data to be processed and lead to better compression ratios
  • Full-Database Caching- Can be used to cache the entire database in-memory when the cache size is greater than the whole database size
  • JSON Support- Support for storing, querying and indexing JSON data, and allowing the database to enforce that the JSON stored conforms to the JSON rules
Kevin Closson points out that the In-Memory feature, which is licensed separately, could be used accidentally since it is on by default after the upgrade, and recommends caution.  
You can read the “new features” guide for a detailed list of improvements in this release.

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