Data Control Language(DCL) is used to control privilege in Database. To perform any operation in the database, such as for creating tables, sequences or views we need privileges. Privileges are of two types,System : creating session, table etc are all types of system privilege.
Object : any command or query to work on tables comes under object privilege.
DCL defines two commands,Grant : Gives user access privileges to database.
Revoke : Take back permissions from user.
To Allow a User to create Session
grant create session to username;
To Allow a User to create Table
grant create table to username;
To provide User with some Space on Tablespace to store Table
alter user username quota unlimited on system;
To Grant all privilege to a User
grant sysdba to username
To Grant permission to Create any Table
grant create any table to username
To Grant permission to Drop any Table
grant drop any table to username
To take back Permissions
revoke create table from username