Oracle Databases


What are Databases?

A database is a structured data collection that has been organized and is electronically stored in a computer system. When the computer was first created, it was primarily utilized to run computations fast for scientific study. The need for the computer to store a larger volume of data for quick retrieval rose as more and more people used it.

What is Oracle Databases?

Some of the largest companies rely on Oracle, one of the most widely used database systems worldwide. Oracle offers cutting-edge capabilities in various areas, including management, performance, security, and development. Oracle has launched numerous distinct Oracle database versions. This database system is simple for both database administrators and developers to build cutting-edge apps for their companies operations. The Oracle name is well-known for its ongoing commitment to laying the groundwork for the future creation of upgraded features to better support businesses of all sizes with their data management requirements. The most recent Oracle versions are currently 11G, 12C, 18C, and 19C. Mobile app development companies use different version for different projects. Let’s discuss these versions:

Features of Oracle 12c Version

Online Rename

In contrast to earlier editions, Oracle database 12c R1 no longer necessitates several steps, such as putting the tablespace in READ ONLY mode, followed by data file offline action. A data file in 12c R1 can be easily renamed or relocated online by using the SQL command ALTER DATABASE MOVE DATAFILE. The end user can execute queries, DML operations, and DDL procedures while the data file is transported. Data files may also be moved across storage types, from non-ASM to ASM and vice versa.

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Online Migration

In Oracle 12c R1, moving a table partition or sub-partition to a new tablespace no longer necessitates a difficult process. A table partition or sub-partition can be transferred to a new tablespace online or offline, similar to how a heap (non-partition) table online migration was accomplished in earlier editions. When an ONLINE clause is supplied, all DML activities on the partition or sub-partition that the process is affecting can be carried out without any interruption. However, no DML activities are permitted if the partition or sub-partition is taken offline.

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Redaction Policy

One of Oracle 12C’s best features is this. Simply enough, data redaction refers to the hiding of data. You can set up a data redaction policy, for instance, masking the SSN field in an employee database. Redaction is the term for this. You can do this using SQL Develop by navigating to the table: Employee > Right-click Security Policy > New > Redaction Policy Type in SSN. The SSN is hidden and is displayed when you pick * from the employee. The new data masking will make use of the DBMS REDACT package. In earlier versions, the FGAC and VPD were extended.

Features of Oracle 18c Version

In-Memory InLine

Having a more adaptable external Oracle table that can support enormous volumes of data for speedier operation, storage, and memory-based compression column, this feature merits its explanation. The environment of the data warehouse will be substantially improved. Additionally, since the data in the external table is largely static, it is better suited for in-memory processing. Oracle predicts a 100-fold improvement as a result of this enhancement. The next stage is examining how to better use of the external table. Without having to create external tables that will only be needed once, inline external tables can be called directly using SQL, which increases development flexibility and minimizes metadata processing.

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SQL Cancelling

Database administrators (DBAs) now have a new command in Oracle Database 18c that they can use to stop blocking or excessively expensive statements without terminating the original session. DBAs used the modify session kill command to end the session in older releases. In Oracle Database 18c, the new alter system cancel SQL command offers an option to eliminate rogue sessions by canceling a SQL statement within a session.

Integration with Microsoft Active Directory

With this Oracle database version 18c, there is no longer a need for any intermediary directories for the database to authenticate and approve users from Microsoft’s Active Directory. This new approach to Active Directory integration is much easier. Before this version, integration required using intermediary software like Oracle Enterprise User Security. Centrally Managed Users (CMU), a new feature, lets you control who can access the Oracle database from Active Directory users. When users are authenticated, the Oracle database enforces Active Directory account policies.

Features of Oracle 19c Version

Flashback in Data Guard

Both the primary database and the backup are currently accessible. Even if you use the flashback capability to flashback the primary database, the standby and primary are still in sync. Until version 19c of Oracle, maintaining consistency and synchronization between the standby and primary required a manual procedure.


The Oracle database version 19c included additional functionality to address evolving client needs. Utilizing cutting-edge tools like AI and ML gives us an advantage in data protection, stability, and space management. Oracle 19c is a more affordable option because of its capabilities it has. The finest performance, scalability, security, and reliability are provided by “This Long Term Support release” for analytical, operational, and mixed applications both locally and in the cloud. Version 19C of the Oracle database differs from versions 12C and 18C.

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