Oracle Database 12c introduces upgrade behavior changes for your database in addition to new features. Changes in behavior include deprecated and desupported initialization parameters, options, syntax, and the deprecation and desupport of features and components.
These topics do not describe new features introduced in Oracle Database 12c, nor do they describe changes in earlier releases of Oracle Database.
Be aware of the implications of deprecated and desupported:
Deprecated features are features that are no longer being enhanced but are still supported for the full life of the 22.214.171.124.
Desupported features are features that are no longer supported by fixing bugs related to that feature, and features for which Oracle may remove the code required to use the feature. Where indicated, a deprecated feature can be desupported in a future major release.
Oracle Database New Features Guide for a complete list of all new features introduced in this release
Oracle Database Reference for a list of new initialization parameters, new static data dictionary views, and new dynamic performance views
Oracle Database Installation Guide for your operating system
Client and Foreground Server Process Memory Changes
To increase optimization and performance, the Oracle Database Client and server process memory requirements are greater than in previous releases.
Every release of Oracle Database includes new features and capabilities. To provide optimal performance for the increased capability of the database, there can be an increase in the Oracle Database Client and Oracle Database Server can increase from one release to the next. The memory requirement increase can vary from platform to platform.
As part of your upgrade plan, check to determine the memory requirements increase that can be present in a new Oracle Database release. For example, in comparison to Oracle Database 11g Release 2 (11.2), Oracle Database 12c on some platforms can have as much as a 5 MB memory increase for each client, and a 10 MB increase for each server.