Oracle DCL and TCL

DCL: Data Control Language DCL are used to configure and control database objects....
TCL - Transaction Control: statements used to manage the changes made by DML statements. It allows statements to be grouped together into logical transactions....
By using the GRANT command you can grant an system level previledge or role to another user.....
The transactions like update, insert or delete can be undone with the help of rollback command. This is helpful when an introduced during your work. ..
Post-Database-Commit It fires once during the Post and Commit Transactions process, after the database commit occurs......