An RDBMS that implements object-oriented features such as user-defined types, inheritance, and polymorphism is called an object-relational database management system (ORDBMS). Column of a database table represents the attributes of an entity and rows of a table stores records. Relational databases store data in a tabular form of rows and columns.

Oracle database is a relational database (RDBMS). The current version of Oracle Database is 18c. Oracle just announced autonomous feature that allows database to be intelligent and self-managed. Not only Oracle is a RDBMS, but also provides functionality for Cloud, Document Store, Graph DBMS, Key-value storage, BLOG, and PDF Storages. Oracle developed by Oracle Corporation is the most popular relational database system (RDBMS). Number of profiles in professional networks including LinkedIn and Upwork.The number of job offers on Indeed and Simply Hired.Frequency of technical discussions on the well-known IT-related Q&A sites Stack Overflow and DBA Stack Exchange.Number of results in Google, Bing, and Yandex search engines.The DB Engines score is calculated based on the following factors, The following table lists world’s most popular databases and their rankings. Oracle is followed by MySQL, SQL Server, PostgreSQL, and MongoDB in the ranking. The most popular database in the world is Oracle according to DB-Engine ranking. Do you wonder which database is the most popular database in the world? Is it MySQL or SQL Server or Oracle? The following table Lists world's most popular databases with their rankings.

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