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NEW QUESTION 1
Which term describes the management of simultaneous transactions to prevent conflicts?
- A. Parallelism
- B. Serialization
- C. Database control
- D. Concurrency control
Answer: D
NEW QUESTION 2
Consider the Registration relation shown in the exhibit. Which of the following SQL statements would return the Registration2 relation from the Registration relation?
- A.
SELECT Course_Code FROM Registration; - B. SELECT *FROM RegistrationWHERE Registration_ID = 1003 AND Registration_ID = 1005;
- C. SELECT *FROM RegistrationWHERE Course_Code = 'A4343';
- D. SELECT Registration_ID, Student_ID, First_Name, Last_Name FROM RegistrationWHERE Course_Code = 'A4343';
Answer: C
NEW QUESTION 3
Consider the Dept1_Parts and Dept2_Parts relations shown in the exhibit. Which of the following SQL statements would create an intersection of the two relations with the widest variety of Structured Query Language dialects?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 4
Which statement best describes a procedural data manipulation language command?
- A.
It contains a query language for retrieving data. - B. It can be used only to manipulate data through a SQL interface.
- C. The user is not required to know how the underlying data structures are implemented.
- D. It requires that the user know how the underlying data structures are implemented.
Answer: D
NEW QUESTION 5
What is the most important service provided by a database management system?
- A. Provides support for a data manipulation language
- B. Allows users to store data in a distributed data repository
- C. Provides support for data formatting language commands
- D. Translates procedural commands into non-procedural commands
Answer: A
NEW QUESTION 6
What is the highest normal form of the relation(s) shown in the exhibit?
- A. Mastered
- B. Not Mastered
Answer: A
NEW QUESTION 7
Consider the Recreation relation shown in the exhibit. You need to apply a SQL statement to the Recreation relation that will return the following data:
Which SQL statement applied to the Recreation relation will return this data?
- A. SELECT Activity FROM Recreation;
- B. SELECT DISTINCT Activity FROM Recreation;
- C. SELECT Activity FROM Recreation WHERE NOT LIKE Activity;
- D. SELECT Activity FROM Recreation WHERE DISTINCT Activity;
Answer: B
NEW QUESTION 8
The exhibit shows a table called Student Relation that tracks all information related to a students courses, professors and sites. What would be the consequence of removing all records for a student with the ID 1311?
- A. Only an update anomaly would occur.
- B. An insertion anomaly would occur.
- C. A deletion anomaly would occur.
- D. An update anomaly and a deletion anomaly would occur.
Answer: C
NEW QUESTION 9
Your enterprise must decide whether to use a database management system. Which of the following lists four advantages of using a DBMS?
- A. Management of data redundancy, increased data integrity, increased data dependence, and increased application complexity
- B. Consistency of data, adherence to standards, managed concurrency, and increased software complexity
- C. Increased data access, increased data backup and recovery, data sharing, and consistency of data
- D. Increased data security, increased data integrity, increased data independence, and decentralization of data
Answer: C
NEW QUESTION 10
Which subset of Structured Query Language (SQL) is used to perform operations such as data retrieval or deletion on the data contained in a database?
- A. Data Control Language
- B. Data Definition Language
- C. Data Formatting Language
- D. Data Manipulation Language
Answer: D
Explanation:
NEW QUESTION 11
Which component in the three-tier database architecture handles the data-processing and business logic?
- A. Thin client
- B. Fat client
- C. Database server
- D. Application server
Answer: D
NEW QUESTION 12
A theta-join can be viewed as:
- A. the intersection of two relations.
- B. a Cartesian product of two relations.
- C. a restricted Cartesian product of two relations.
- D. the Cartesian product of two union-compatible relations.
Answer: C
NEW QUESTION 13
Consider the following database information:
domain s_id: integer
domain grd: fixed length character string length 1
STUDENT_GRADE(
Student_Number: s_id NOT NULL Grade: grd )
Primary Key Student_Number
During which phase of the database design process would this information be developed?
- A. Logical
- B. Physical
- C. Conceptual
- D. Implementation
Answer: A
Explanation:
NEW QUESTION 14
Which term describes the rejoining of relations that have been decomposed?
- A. Normalization
- B. Denormalization
- C. Referential integrity
- D. Domain constraints
Answer: B
NEW QUESTION 15
What is the highest normal form of the relation(s) shown in the exhibit?
- A. Boyce-Codd normal form
- B. First normal form
- C. Second normal form
- D. Third normal form
Answer: C
NEW QUESTION 16
Consider the relation shown in the exhibit. Which of the following SQL statements would return a relation that excludes all customers with a Satisfaction_Rate of less than or equal to 80 unless the Sales_Office is located in Atlanta?
- A. SELECT *FROM CustomersWHERE Satisfaction_Rate > 80 OR Sales_Office = Atlanta;
- B. SELECT *FROM CustomersWHERE Satisfaction_Rate <= 80 AND Sales_Office = Atlanta;
- C. SELECT *FROM CustomersWHERE Satisfaction_Rate >= 80;
- D. SELECT *FROM CustomersWHERE Satisfaction_Rate >= 80 AND NOT Sales_Office = Atlanta;
Answer: A
NEW QUESTION 17
Consider the table for an employee database shown in the exhibit. What is the degree of the table?
- A. 25
- B. 5
- C. 4
- D. 20
Answer: B
NEW QUESTION 18
The exhibit shows a table called Activity Relation that relates a unique student identification number with a sports activity and a fee for participating in that activity. A student can participate in only one activity. The key for the relation is Student_ID. What consequence would occur if the tuple for Student_ID 1001 were removed?
- A. An update anomaly would occur.
- B. An insertion anomaly would occur.
- C. A deletion anomaly would occur.
- D. Both an insertion anomaly and a deletion anomaly would occur.
Answer: C
NEW QUESTION 19
In which situation would the DBMS use a serial schedule to execute the transactions?
- A. Concurrent transactions read data from the same data structure.
- B. Concurrent transactions write data to different data structures.
- C. Concurrent transactions read or write the same data structure.
- D. Concurrent transactions read or write from different data structures.
Answer: C
Explanation:
NEW QUESTION 20
For the Employee relation shown in the exhibit, which set of column values holds the complete tuple for the employee named James Smith?
A. 0002, James, Smith
- A. 0002, James, Smith, 10-25-76
- B. First_Name, James, Last_Name, Smith
- C. Emp_ID, 0002, First_Name, James, Last_Name, Smith
Answer: B
NEW QUESTION 21
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