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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?
Recognize level within a database system (user, programmer of application software, and designer of the DBMS software) at which each of the following concerns or activities occur.
Create a script file to list the files in a directory in sorted order, showingonlythe file name, file size, and modification date.Each file's attributes must be on one line per file, in any order.
You should choose a data storage problem of your interest and identify the different pieces of data that should be stored in database.
relational algebragiven the following set of relations from the east coast aquarium database list the sequence of
In talking about database security, some aspects to regard as are Data Integrity, Confidentiality, and Malicious Activity. Illustrate how does database security relate to data integrity?
Transform the tables into one or more tables in BCNF. State the primary keys, candidate keys, and referential integrity constraints.
what do you think is the wisdom of maintaining 2 models? The W3C has a Document Object Model as a recommendation. Do you think browsers should implement this model? If not, propose a model which you think would be suitable.
based on the baxter aviation scenario that you used for the first exam. please read the following narrative carefully
Explain how you would follow three phases of traditional database design method (Hierarchical, Network, and Relational), considering the following scenario.
Identify the valid entities, and explain why the rejected entities should no be modeled and create a data model of the process showing entity associations.
What rules would have to be enforced based on entity type? Choose one entity type and discuss what enforcement is needed by the database or application.
If we added hats in 3 sizes and 3 colors and 3 styles, discuss briefly how many additional tables you 'uld add to the design.
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