Any of the developments are fairly minor and incremental. For example, in previous versions of App Express, the end date within a range was removed from the list. In version 5.1, it is including with Oracle 18c, the range end date is included as it is with all other elements of Application Express. Now, version 5.1 also enables end-users to access their scheduling with the arrow keys on the keyboard, an update to the interface that is tiny but usefully intuitive.
In the updated Oracle, other improvements are more important and can have a greater impact on your everyday operations. These five impacts us as has been the most important.

Integration with Microsoft Active Directory
The database will authenticate and authorize users from Microsoft’s Active Directory, beginning with Oracle 18c, without any intermediate directories being needed.
This is a modern, easier way for Active Directory to integrate. Intermediary software such as Oracle Enterprise Public Participation was needed in previous versions to achieve integration.
This new function is called Centrally Managed Users (CMU) and allows you to manage Oracle application access authorization for Active Directory users. When clients are authenticated in this way, Active Directory account policies are implemented by the Oracle database.
Schema Only Accounts
In the past, as a user profile that held certain objects, a schema could be linked more closely. But this also meant that a user could log in and have control over all artifacts in the schema.
With schema accounts only, clients are still unable to login to the schema directly. These kinds of profiles can be developed without a password and, much like a normal user profile, allowances or tasks can be allocated.
Server Draining Ahead of Planned Maintenance
The database will now fail over the sessions to another service or node in a RAC area, Oracle 18c. For example, if a service is transferred to another node, the database labels existing drainage sessions so that the application is not disturbed. Any new sessions will be guided to another usable operating service.
The database uses a collection of rules to assess the end of a session and can be deleted from the server. These rules include custom SQL link checks and access limits where no request is active or operation is finished and the session has one or more recoverable states that can be reconstructed during failover.
Automatic In-Memory
As a manner to improve performance by maintaining columnar-compressed database segments in storage, Oracle In-Memory was implemented in version 12c. In 18c, Oracle promotes in-memory development by introducing Automatic In-memory (AIM). By creating a heat map of the in-memory enabled items, Target operates and creates opportunities for more commonly used applications objects. Only when there isn’t enough space to add another item to the memory store will Goal kick in.
SQL Cancel
In previous versions of Oracle, it was determined to destroy the session that was operating SQL if a database administrator tried to cancel a SQL query. This meant the session had to be removed from the database and a new connection had to be started. In Oracle 18c, the SQL statement itself can now be deleted and scaled back.
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