In a database it is very necessary to control the roles of a user; User in a database can have multiple roles. Roles can be either just for accessing the database like reading or writing or it can be read only role as well. The role a user is granted depends on the functionality it performs. Now before creating a database it is necessary to define roles of a user, it helps the dba to understand the users who can access and who cannot access the database.

We use the command >>grant, To grant access to users. We can even identify the users with their name and password. SO, whenever a user wants to link to the database, the user has to connect using username and password.

>>Connect Username/password.

For e.g.: we create a user by name scott and who can access the database with a password tiger, for this, we write:

>>Connect scott/tiger;

Or >> connect scott

Password tiger

To create a new user we write the command >>create

>>create user scott identified by tiger;

This creates a user named scott and who can access the database using password tiger.

In order to grant access to the user we write;

>>Grant connect, resource, dba to user 1;

For e.g.;  >>grant connect, resource, dba to scott;

Using this granting the user scott can connect to the database, access the resources and access the database as well.

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