Which are the prerequisites for performing flashback transactions on your database？（）

What are the prerequisites for performing flashback transactions? （）(Choose all that apply)

In your production database， you observe that users’ transactions are consuming a lot of resources and you plan to impose resource restrictions by using Resource Manager. For which three resources can you enable usage restrictions by using Resource Manager？ （）

User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA， which commands must you execute to enable SCOTT to flash back the transactions？（）

Which two statements are true regarding transactions in an Oracle database（）

You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database. What must you do accomplish this task?（）

None of the day’s transactions, ______ sales or delivery, came off well.

You are maintaining a database of credit card transactions. You want the data to be returned automatically in the chronological order of the credit card numbers without using the ORDER BY clause in the query. Which type of cluster will you use to obtain the desired result？（）  

In your production database， you observe that users’ transactions are consuming a lot of resources and you plan to impose resource restrictions by using Resource Manager.  For which three resources can you enable usage restrictions by using Resource Manager？（）

It is a holiday and no transactions are being performed on the database. You took a consistent backup of your database without using Recovery Manager （RMAN）. How would you make use of this consistent backup in RMAN？（）