(Answered) 1which of the following plays an important role in

Programming

1.Which of the following plays an important role in representing informa-tion about the real world in a database? Explain brie?y.

1. The data de?nition language.

2. The data manipulation language.

3. The bu?er manager.

4. The data model.

2.Answer the following questions:

1. What is a transaction?

2. Why does a DBMS interleave the actions of di?erent transactions instead of exe-cuting transactions one after the other?

3. What must a user guarantee with respect to a transaction and database consis-tency? What should a DBMS guarantee with respect to concurrent execution of several transactions and database consistency?

4. Explain the strict two-phase locking protocol.

5. What is the WAL property, and why is it important?

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