Database Tutorials


ORA-01045: user xxx lacks CREATE SESSION privilege; logon denied

In the Oracle database, if you have created a new user and tried to log in with a newly created […] Continue reading »

MongoDB- ADD, MODIFY/RENAME, or DELETE Key

In MongoDB database, db.collection.update({criteria},{$operator: {new value}}) or db.collection.updateMany({criteria},{$operator: {new value}}) method is used to ADD, DELETE, or MODIFY/RENAME the existing […] Continue reading »

MongoDB- INSERT, SELECT, UPDATE, and DELETE Query

This page will help you to perform the basic query/operation with the MongoDB database like SELECT, INSERT, UPDATE, and DELETE. […] Continue reading »

How to set Username, Password, and Roles to MongoDB Database

In this guide, we’ll show you how to set username, password, and roles to the MongoDB database. MongoDB database instance […] Continue reading »

How to set .bash_profile in Linux for Oracle

This page will walk through How to set .bash_profile in Linux for Oracle. .bash_profile is executed to configure your login shell before […] Continue reading »

Overview and Architecture of Oracle Database Server

This page will walk through overview and architecture of Oracle Database Server. An Oracle Database consists of at least one database […] Continue reading »

Overview, Editions, and Features of Oracle Database

In this article, we will cover the overview, editions, and features of the Oracle database. We have already discussed data, […] Continue reading »

Overview of Data, Database, DBMS, and RDBMS

In this article, we will understand the Overview of Data, Database, DBMS, and RDBMS. What is Data? Data is a piece […] Continue reading »