What is Object Oriented Database?

By | October 7, 2021
What is Object-Oriented Database

A digital database is a collection of organised data held in a computer data bank. A database is designed in such a way which make it easy for the user to access the data. The database follows a specific data structure which decides how should be the data put in a database. To connect and interact with the database we users have to perform queries which are simple command to retrieve, create, update and delete data within the database. And to perform queries on a Database, we require a software known as Database Management System.

There are various types of database models out there, and the Database models define how should be the data represented in the database.


Some common database models:

Here in this article, we will only be discussing the OODBs Database. In this article, you will be learning all the governing concepts of Object Oriented Databases (OODBs), the query language used by it, its architecture and much more.

What is Object Oriented Databases?

The OODBs follows the same principle of Object Oriented Programming.  in this database, the data is stored in the form of objects using the concept of Class and Objects. An object can be identified as a real-world entity and a class as a collection of objects.

For example, if we want to store a record of a new employee in a Company Employees database, then a new object of the employee will be created, and then it will be stored in the database. The object will contain all the information about the new employee, and it can be accessed through any OODB.

Not all applications use Object Oriented database, because it is built to deal with complex data-structure. And most of the applications prefer to make simple and straightforward databases such as Relational. But Object Oriented databases can perform complex calculation and provide the faster result as compared to relational databases, that’s why many sectors such as 3D modelling architecture, telecommunication, scientific products, astronomical products and molecular science use Object Oriented Databases.

The Object Oriented Database supports the concepts of Object Oriented Programming such as:

  • Object Identity
  • Polymorphism
  • Encapsulation

Object Oriented Database Architecture

The Object Oriented Database Architecture is Divided into two categories:

  • Object Oriented Database or Standalone Object Oriented Database
  • Object Relational Database.

Object Oriented Database Architecture

The object oriented Database or standalone object oriented database stores Data in the form of Objects using the object data model. And when Object Oriented programming creates a data object it can be directly stored in the OO Database without needing any conversion or mapping.

In Object-Oriented Programming language, we mainly use Class and Object to deal with data, and OO Database acts as a perfect database to store Data Created by program’s classes and objects. This is also one of the main reasons why the Object-Oriented Database is much faster than the Relational Database.

Object-Relational Database

In Object-Relational Database the object data is mapped to the relational database. Here the OO Database represents a staging layer for Relational Database. The program or application generally use the Object data which cannot be directly saved to the Relational Database, se we require an Object-Relational DBMS which convert or map the object data to the Relational data.

What is Object Query Language (QQL)?

To handle the database, we require an Application Programming Interface (API) or query language. Different Database models have different Query languages, for example, Relational Database has Structured Query Language (SQL), and Object-Oriented Database has Object Query Language.

The QQL is similar to SQL but instead of the table, we have objects in and class in OOB.

Select query in QQL:

SELECT emp.name
FROM employee emp
WHERE emp.state ="New Delhi"

Here emp is an object of class employee.


  • It can manage large complex data.
  • It is very compatible with all high-level programming languages.
  • It is much faster than a relational database.
  • To use relational data in our program which is stored in the form of rows and columns requires more loading process and memory storage, but object data can be used directly.
  • RDBMS uses an API object-relational mapping (ORM) to build its database schema using object code but Object Database can do this without using any interface.


  • It is not much in use like Relational Database.
  • Not many programming languages supports OODB.
  • It does not have a huge community.
  • It also has a very high learning curve, which makes it very difficult for a developer to use this database.


In 1985 the concept of Object Database came in existence, but it could never overcome the popularity of Relational Database amongst Database administrators and Developers.  There is no doubt that it is one of the fastest Database we have but its complex structure makes it no use for simple Database requirements.  Not every developer deal with 3D complex data so they don’t find any use of Object-Database in their project.

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